WDM device and method of manufacture, communication device

Abstract

The application provides a wavelength division multiplexing (WDM) device. The WDM device comprises a plurality of band-pass filters or a plurality of band-stop filters, and can further comprise a total reflection structure or a low-pass / high-pass filter. By using the WDM device, a plurality of single-fiber multi-wavelength signals can be combined into one single-fiber multi-wavelength signal, so that the cost of optical signal processing is reduced.

Description

Technical Field

[0001] This application relates to the field of communications, and more specifically, to a wavelength division multiplexing (WDM) device, a method for manufacturing it, and a communication device. Background Technology

[0002] Fiber optic communication is a common communication technology. For example, in wireless communication systems, fiber optic communication is widely used between base stations, between core networks and base stations, between core network devices, and between baseband units and wireless units of base stations.

[0003] Wavelength division multiplexing (WDM) is a technology that combines multiple optical signals of different wavelengths together using a multiplexer and couples them into the same optical fiber for data transmission.

[0004] A small form-factor pluggable (SFP) module is an optical module that performs photoelectric conversion, i.e., modulating an electrical signal onto a light wave to obtain an optical signal, and / or demodulating an electrical signal from an optical signal. Both a single-wavelength optical signal output from the SFP and a single-wavelength optical signal input to the SFP are transmitted on an optical fiber. To improve transmission efficiency, WDM can be used to combine the single-wavelength signal output from the SFP and the single-wavelength signal input to the SFP into a single-wavelength multi-wavelength signal for transmission.

[0005] Currently, dual small form-factor pluggable (DSFP) modules have entered industrial applications due to their similar packaging to SFP modules and the advantage of providing dual-channel interfaces. Limited by the fiber density supported by the SFP packaging, DSFP currently supports dual-channel single-fiber bidirectional, i.e., BiDi (BiDirectional) optical signal processing.

[0006] However, current WDM devices cannot support the multiplexing of multiple (also known as multi-channel or multi-wavelength) single-fiber optical signals using a single WDM device, such as the dual (also known as dual-channel) single-fiber multidirectional optical signals in a DSFP. How to enable a single WDM device to support the multiplexing of multiple single-fiber multi-wavelength optical signals is a problem that urgently needs to be solved. Summary of the Invention

[0007] This application provides a WDM device, a method for manufacturing the WDM device, and a communication device, enabling a single WDM device to support the multiplexing of multiple single-fiber multi-wavelength optical signals, and correspondingly, to support the splitting of a single single-fiber multi-wavelength optical signal into multiple single-fiber multi-wavelength optical signals.

[0008] A first aspect of this application provides a wavelength division multiplexing (WDM) device, which may include:

[0009] At least two first incident ports, at least two band-stop filter groups, a first low-pass or high-pass filter group, and a first common port;

[0010] The at least two first incident ports include first incident port I. 1,1 and the first incident port I 1,2 The first incident port I 1,1 The first input port I is used to input a first input signal M1 having X1 wavelengths. 1,2 Used to input the second channel's first input signal N1 with Y1 wavelengths;

[0011] The at least two sets of band-stop filter groups include a first band-stop filter group and a second band-stop filter group.

[0012] The X1 first band-stop filters in the first band-stop filter group are used to split the incident first input signal M1 with X1 wavelengths into X1 single-wavelength signals. 1,1 To signal M 1,X1 Wherein, the X1 wavelength includes the Eth wavelength. 1,1 wavelength up to E 1,X1 Wavelength, the X1 single-wavelength signal, signal M 1,1 To signal M 1,X1 One-to-one correspondence with the Eth 1,1 wavelength up to E 1,X1 Wavelength, the Eth 1,1 wavelength up to E 1,X1 The wavelengths are respectively located within the stopband range of the X1 first band-stop filters, and the i1th first band-stop filter among the X1 first band-stop filters is used to reflect the Eth wavelength. 1,i1 Wavelength signal M 1,i1 And transmit the signal of the first other wavelength input to the i1th first band-stop filter, where X1 is an integer greater than 1, i1 is an integer from 1 to X1, and the first other wavelength belongs to the Eth band-stop filter. 1,1 wavelength up to E 1,X1 wavelength;

[0013] The Y1 second band-stop filters in the second band-stop filter group are used to split the incident second-path first input signal N1 with Y1 wavelengths into Y1 single-wavelength signals. 1,1 To signal N 1,Y1 Wherein, the Y1 wavelength includes the Fth wavelength. 1,1 wavelength up to F 1,Y1 Wavelength, the Y1 channel single-wavelength signal, signal N 1,1 To signal N 1,Y1 One-to-one correspondence with the Fth 1,1 wavelength up to F 1,Y1 Wavelength, the Fth 1,1 wavelength up to F 1,Y1 The wavelengths are respectively located within the stopband range of the corresponding second band-stop filters in the Y1 second band-stop filters, and the j1th second band-stop filter in the Y1 second band-stop filters is used to reflect the Fth second band-stop filter. 1,j1 Wavelength signal N 1,j1 And transmit the signal of the second other wavelength input to the j1th second band-stop filter, where Y1 is an integer not less than 1, j1 is an integer from 1 to Y1, and the second other wavelength belongs to the Fth... 1,1 wavelength up to F 1,Y1 wavelength;

[0014] The W1 second band-stop filters in the second band-stop filter group are also used to filter the X1 single-wavelength signals, signal M. 1,1 To signal M 1,X1 The signals are sequentially compared with the single-wavelength signals of the Y1 channel, and the signal N. 1,1 To signal N 1,Y1 Combined signals to obtain the W1 multi-wavelength signal T. 1,t1＝1…W1 W1 is the larger of X1 and Y1. When X1 is greater than Y1, the W1 second band-stop filters include the Y1 second band-stop filters. When X1 is less than Y1, the W1 second band-stop filters are a portion of the Y1 second band-stop filters. When X1 is equal to Y1, the W1 second band-stop filters are the Y1 second band-stop filters. The j1th second band-stop filter among the Y1 second band-stop filters is also used to transmit the signal M input to the j1th second band-stop filter. 1,i1 To obtain multi-wavelength signal T 1,t1 The multi-wavelength signal T 1,t1 Having the Eth 1,i1 Wavelength and the Fth 1,j1 Wavelength, where t1 is an integer from 1 to W1;

[0015] The first low-pass or high-pass filter group includes Z1 first low-pass or high-pass filters and is used to filter Z1 multi-wavelength signals P1,k1＝1…Z1 The Z1 multi-wavelength signal P is obtained by combining the signals to obtain a single-channel multi-wavelength output signal Q1. 1,k1＝1…Z1 The W1 multi-wavelength signal P 1,t1＝1…W1 The t1 multi-wavelength signal P in 1,t1 Including the W1 multi-wavelength signal T 1,t1＝1…W1 The t1 multi-wavelength signal T in 1,t1 The Z1 first low-pass or high-pass filters include W1 first low-pass or high-pass filters, and the W1 multi-wavelength signals P 1,t1＝1…W1 Located within the stopband range of the corresponding first low-pass or high-pass filter among the W1 first low-pass or high-pass filters, the t1th first low-pass or high-pass filter among the W1 first low-pass or high-pass filters is used to reflect the t1th multi-wavelength signal P. 1,t1 And transmit signals of other wavelengths input to the t1th low-pass or high-pass filter, where k1 is an integer from 1 to Z1, and Z1 is an integer greater than or equal to W1;

[0016] The first common port is used to output the single-channel multi-wavelength output signal Q1 obtained by the first low-pass or high-pass filter group.

[0017] Using this WDM device can reduce the cost of optical signal processing.

[0018] Secondly, this application also provides a WDM device, comprising:

[0019] At least two first incident ports, at least one combined branching structure and a first common port;

[0020] The at least one combined branch structure includes a first combined branch structure;

[0021] The first combining and splitting structure includes two bandpass filters and two total reflection structures;

[0022] The at least two first incident ports include first incident port I 1,1 and the first incident port I 1,2 The first incident port I 1,1 The first input channel has two wavelengths, E. 1,1 Wavelength and E 1,2 The first input signal M1 with wavelength, and the first incident port I 1,2 The second input channel has two wavelengths, F. 1,1 Wavelength and F 1,2 The first input signal N1 with wavelength;

[0023] The two bandpass filters include a first bandpass filter and a second bandpass filter;

[0024] The two total reflection structures include a first total reflection structure and a second total reflection structure;

[0025] The first bandpass filter is used to transmit light from the first incident port I. 1,1 The Eth wave of the incident first path input signal M1 with two wavelengths 1,2 wavelength and reflect the Eth 1,1 wavelength;

[0026] The first bandpass filter is also used to reflect light from the first incident port I. 1,2 The Fth wave in the incident second path input signal N1 with two wavelengths 1,1 Wavelength and the Fth 1,2 wavelength;

[0027] The first total internal reflection structure is used to reflect the Eth wave from the first bandpass filter. 1,1 wavelength;

[0028] The second total internal reflection structure is used to reflect the Eth wave from the first bandpass filter. 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength;

[0029] The second bandpass filter is used to transmit the Eth element from the first total internal reflection structure. 1,1 wavelength and reflect the Eth 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength;

[0030] The first common port is used to output a single-channel multi-wavelength signal Q1, the wavelength of which includes the Eth wavelength. 1,1 Wavelength, the Eth 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength.

[0031] This WDM device can reduce the cost of optical signal processing. It uses a bandpass filter, which is simpler and easier to manufacture than a bandstop filter.

[0032] Thirdly, this application also provides a WDM device, comprising:

[0033] At least two first emission ports, at least two band-stop filter groups, a first low-pass or high-pass filter group, and a first common port;

[0034] The first common port is used to input a single-channel multi-wavelength output signal Q1, the wavelength of which includes the Eth wavelength.1,1 wavelength up to E 1,X1 Wavelength, Fth 1,1 wavelength up to F 1,Y1 wavelength;

[0035] The first low-pass or high-pass filter group includes Z1 first low-pass or high-pass filters and is used to split Z1 multi-wavelength signals P from the single-channel multi-wavelength output signal Q1. 1,k1＝1…Z1 The Z1 multi-wavelength signal P 1,k1＝1…Z1 The W1 multi-wavelength signal P 1,t1＝1…W1 The t1 multi-wavelength signal P in 1,t1 Including W1 multi-wavelength signal T 1,t1＝1…W1 The t1 multi-wavelength signal T in 1,t1 The Z1 first low-pass or high-pass filters include W1 first low-pass or high-pass filters, and the W1 multi-wavelength signals P 1,t1＝1…W1 Located within the stopband range of the corresponding first low-pass or high-pass filter among the W1 first low-pass or high-pass filters, the t1th first low-pass or high-pass filter among the W1 first low-pass or high-pass filters is used to reflect the t1th multi-wavelength signal P. 1,t1 And transmit signals of other wavelengths input to the t1th low-pass or high-pass filter, where k1 is an integer from 1 to Z1, and Z1 is an integer greater than or equal to W1; the W1 second band-stop filters in the second band-stop filter group are used to transmit the W1 multi-wavelength signals T 1,t1＝1…W1 The signal is divided into X1 single-wavelength channels, signal M. 1,1 To signal M 1,X1 And the Y1 single-wavelength signal, signal N 1,1 To signal N 1,Y1 W1 is the larger of X1 and Y1. When X1 is greater than Y1, the W1 second band-stop filters include the Y1 second band-stop filters. When X1 is less than Y1, the W1 second band-stop filters are a portion of the Y1 second band-stop filters. When X1 is equal to Y1, the W1 second band-stop filters are the Y1 second band-stop filters. The X1 channel is a single-wavelength signal, and the signal M... 1,1 To the signal M 1,X1 One-to-one correspondence with the Eth 1,1 wavelength up to E 1,X1 Wavelength, the Y1 channel single-wavelength signal, signal N 1,1 To signal N 1,Y1 One-to-one correspondence with the Fth 1,1 wavelength up to F 1,Y1 Wavelength, the Fth 1,1 wavelength up to F 1,Y1The wavelengths are respectively located within the stopband range of the corresponding second band-stop filters among the Y1 second band-stop filters. The j1th second band-stop filter among the Y1 second band-stop filters is used to transmit the signal T input to the j1th second band-stop filter. 1,t1 The Eth 1,i1 Wavelength to obtain a single-wavelength signal M 1,i1 And reflect the signal T input to the j1-th second band-stop filter. 1,t1 The Fth 1,j1 Wavelength to obtain a single-wavelength signal N 1,j1 , where t1 is an integer from 1 to W1, Y1 is an integer not less than 1, and j1 is an integer from 1 to Y1;

[0036] The Y1 second band-stop filters are also used to filter the Y1 single-wavelength signal, signal N. 1,1 To signal N 1,Y1 The signals are combined into a second output signal N1 with Y1 wavelengths. The j1th second band-stop filter among the Y1 second band-stop filters is also used to transmit signals of other second wavelengths input to the j1th second band-stop filter, wherein the other second wavelength belongs to the Fth second band-stop filter. 1,1 wavelength up to F 1,Y1 wavelength and excluding the Fth wavelength 1,j1 wavelength;

[0037] The X1 first band-stop filters in the first band-stop filter group are used to filter X1 single-wavelength signals, signal M. 1,1 To signal M 1,X1 The signals are combined into a first output signal M1 with X1 wavelengths, wherein the X1 wavelengths include the Eth wavelength. 1,1 wavelength up to E 1,X1 Wavelength, the Eth 1,1 wavelength up to E 1,X1 The wavelengths are respectively located within the stopband range of the X1 first band-stop filters, and the i1th first band-stop filter among the X1 first band-stop filters is used to reflect the Eth wavelength. 1,i1 Wavelength signal M 1,i1 And transmit the signal of the first other wavelength input to the i1th first band-stop filter, where X1 is an integer greater than 1, i1 is an integer from 1 to X1, and the first other wavelength belongs to the Eth band-stop filter. 1,1 wavelength up to E 1,X1 wavelength;

[0038] The at least two first incident ports include a first exit port I. 1,1 and the first exit port I 1,2 The first output port I 1,1The first incident port I is used to output the first output signal M1 with X1 wavelengths from the first channel. 1,2 Used to output the second channel's first output signal N1, which has Y1 wavelengths.

[0039] This WDM device uses a band-stop filter and splits a single multi-wavelength signal into multiple multi-wavelength signals, which can reduce the processing cost of optical signals.

[0040] Fourthly, this application also provides a wavelength division multiplexing (WDM) device, comprising:

[0041] At least two first output ports, at least one combined branching structure and a first common port;

[0042] The first common port is used to input a single-channel multi-wavelength signal Q1, the wavelength of which includes the Eth wavelength. 1,1 Wavelength, Eth 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength;

[0043] The at least one combined branch structure includes a first combined branch structure;

[0044] The first combining and splitting structure includes two bandpass filters and two total reflection structures;

[0045] The at least two first emission ports include first emission port I 1,1 and the first exit port I 1,2 The first output port I 1,1 Used to output the first channel with 2 wavelengths, the Eth... 1,1 Wavelength and E 1,2 The first output signal M1 with wavelength, and the first output port I 1,2 Used to output the second channel with 2 wavelengths, the Fth... 1,1 Wavelength and F 1,2 The first output signal N1 with wavelength;

[0046] The two bandpass filters include a first bandpass filter and a second bandpass filter;

[0047] The two total reflection structures include a first total reflection structure and a second total reflection structure;

[0048] The second bandpass filter is used to transmit the Eth wave of the single-channel multi-wavelength signal Q1 from the first common port. 1,1 wavelength and reflect the Eth 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength;

[0049] The first total internal reflection structure is used to reflect the Eth wave from the second bandpass filter. 1,1 wavelength;

[0050] The second total internal reflection structure is used to reflect the Eth wave from the second bandpass filter. 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength;

[0051] The first bandpass filter is used to transmit the Eth element from the second total internal reflection structure. 1,2 wavelength and reflect the Fth from the second total reflection structure 1,1 Wavelength and the Fth 1,2 wavelength, and reflects the Eth wave from the first total reflection structure. 1,1 wavelength, so that the first path has 2 wavelengths, the Eth 1,1 Wavelength and E 1,2 The first output signal M1 and the second channel have two wavelengths, and the Fth channel has two wavelengths. 1,1 Wavelength and F 1,2 The output signal N1 has a wavelength of .

[0052] This WDM device uses a bandpass filter to split a single multi-wavelength signal into multiple multi-wavelength signals, which can reduce the processing cost of optical signals. Furthermore, the manufacturing process of a bandpass filter is simpler than that of a bandstop filter.

[0053] Fifthly, this application also provides a wavelength division multiplexing (WDM) device, including two four-port thin-film filters (TFFs), a first TFF and a second TFF; the four ports include port a, port b, port c and port d; each TFF includes two fiber collimators;

[0054] The first bandpass filter is fixed inside the first TFF and located between the two fiber collimators of the first TFF; the second bandpass filter is fixed inside the second TFF and located between the two fiber collimators of the second TFF;

[0055] A signal 1 with a first wavelength and a second wavelength is input to port a of the first TFF. The first wavelength is located within the passband range of the first TFF, and the second wavelength is located within the stopband range of the first TFF. The signal 1-1 with the first wavelength is output from port d, and the signal 1-2 with the second wavelength is output from port b.

[0056] The first TFF inputs a signal 2 with a third wavelength and a fourth wavelength at port c, both of which are located within the stopband of the first TFF, and outputs the signal 2 with the third wavelength and the fourth wavelength from port d.

[0057] The port c of the first TFF is connected to the port a of the second TFF, and the port d of the first TFF is connected to the port c of the second TFF;

[0058] The second wavelength is located in the passband range of the second TFF, and the first wavelength, the third wavelength and the fourth wavelength are all located in the stopband range of the first TFF. The signal 1-1 with the first wavelength, the signal 1-2 with the second wavelength and the signal 2 with the third wavelength and the fourth wavelength are all output from port d of the second TFF and combined into a signal with 4 wavelengths.

[0059] Each of the aforementioned TFFs may also include a cannula.

[0060] The aforementioned WDM device also includes a housing for encapsulating the plurality of TFFs.

[0061] This WDM device uses a TFF structure with a built-in bandpass filter, which simplifies the assembly of the WDM.

[0062] Sixthly, this application also provides a wavelength division multiplexing (WDM) device, including two four-port thin-film filters (TFFs), a first TFF and a second TFF; the four ports include port a, port b, port c and port d; each TFF includes two fiber collimators;

[0063] The first band-stop filter is fixed inside the first TFF and located between the two fiber collimators of the first TFF; the second band-stop filter is fixed inside the second TFF and located between the two fiber collimators of the second TFF;

[0064] A signal 1 with a first wavelength and a second wavelength is input into port a of the first TFF. The first wavelength is located in the stopband range of the first TFF, and the second wavelength is located in the passband range of the first TFF. The signal 1-1 with the first wavelength is output from port b, and the signal 1-2 with the second wavelength is output from port d.

[0065] The first TFF inputs a signal 2 with a third wavelength and a fourth wavelength at port c, both of which are located within the stopband of the first TFF, and outputs the signal 2 with the third wavelength and the fourth wavelength from port b.

[0066] Port b of the first TFF is connected to port a of the second TFF, and port d of the first TFF is connected to port c of the second TFF;

[0067] The second wavelength is located in the stopband range of the second TFF, and the first wavelength, the third wavelength and the fourth wavelength are all located in the passband range of the first TFF. The signal 1-1 with the first wavelength, the signal 1-2 with the second wavelength and the signal 2 with the third wavelength and the fourth wavelength are all output from port d of the second TFF and combined into a signal with 4 wavelengths.

[0068] Each of the aforementioned TFFs may also include a cannula.

[0069] The aforementioned WDM device also includes a housing for encapsulating the plurality of TFFs.

[0070] This WDM device uses a TFF structure with a built-in band-stop filter, which makes the assembly of the WDM simpler.

[0071] Seventhly, this application also provides a wavelength division multiplexing (WDM) device, including a Z-Block structure. The Z-Block structure has multiple isosceles right-angled triangular prism notches on both sides. The right-angled faces of the isosceles right-angled triangular prisms are perpendicular to the notches. The inclined faces of the isosceles right-angled triangular prisms on the same side are parallel. The notches on both sides are equidistant and their inclined faces are also parallel. The notch on the first side includes a notch for a first incident port, and the notch on the second side includes a notch for a first common port. A first triangular prism filter is provided in both the notch for the first incident port and the notch opposite to the notch for the first incident port. The inclined face of the first triangular prism filter is coated with a band-stop filter film. A second triangular prism filter is provided in both the notch for the first common port and the notch opposite to the notch for the first common port. The inclined surface of the first triangular prism filter is coated with a first low-pass or high-pass filter film. The band-stop filter film is used to reflect wavelengths within a specific range. The first incident port is used to input a single signal with X wavelengths. The number of wavelengths X of the signal input to the first incident port through at least one of the multiple notches is an integer greater than 1. The first low-pass or high-pass filter film is used to combine the single-channel multi-wavelength signals input from multiple first incident ports after passing through the band-stop filter film to obtain a single-channel signal with Y wavelengths, where Y is the sum of the number of wavelengths X input from each first incident port. The first common port is used to output the combined single-channel signal with Y wavelengths. The inclined surface of the first triangular prism filter is parallel to the inclined surface of the isosceles direct triangular prism of the notch where it is located, and the inclined surface of the second triangular prism filter is parallel to the inclined surface of the isosceles direct triangular prism of the notch where it is located.

[0072] This WDM device uses a Z-block structure with a built-in band-stop filter film. The Z-block structure allows for smaller device size and lower cost.

[0073] Optionally, the first low-pass or high-pass filter film coated on the inclined surface of the second triangular prism filter disposed in the notch opposite to the notch for the first common port is used for total internal reflection.

[0074] Optionally, the notch opposite to the notch for the first incident port is also used for the second incident port. The notch on the first side also includes a notch for the second common port. A third triangular prism filter is provided in both the notch for the second common port and the notch opposite to the notch for the second common port. The inclined surface of the third triangular prism filter is coated with a second low-pass or high-pass filter film. The second low-pass or high-pass filter film is used to combine the signal obtained after the single-channel signal with M wavelengths input from the second incident port passes through the band-stop filter film, thereby obtaining a single-channel signal with N wavelengths. The second common port is used to output the combined single-channel signal with N wavelengths. The number of wavelengths M of the signal input to the second incident port by at least one of the multiple opposite notches is an integer greater than 1. N is the sum of the number of wavelengths M input to each of the second incident ports. The inclined surface of the third triangular prism filter is parallel to the inclined surface of the isosceles direct triangular prism of the notch where it is located.

[0075] Eighthly, this application also provides a communication device including a WDM device as provided in any of the foregoing aspects.

[0076] Ninthly, this application also provides a method for manufacturing a WDM device, which obtains the WDM device as described in any of the foregoing aspects by setting and / or connecting the components in the WDM device provided in any of the foregoing aspects.

[0077] The various possible implementations provided in this application can be referred to the description in the claims, and will not be repeated here.

[0078] Based on the above WDM devices, the processing cost of optical signals can be reduced, the insertion loss of links can be reduced, and the complexity of link configuration can be reduced, thereby reducing manual configuration costs. Attached Figure Description

[0079] Figure 1 This is a schematic diagram of a WDM structure connected to a BiDi-DSFP.

[0080] Figure 2 This is a schematic diagram of a WDM device provided in an embodiment of this application.

[0081] Figure 3 This is a schematic diagram of a dual-density WDM device provided in an embodiment of this application.

[0082] Figure 4 This is a schematic diagram of a Z-block-based WDM device provided in an embodiment of this application.

[0083] Figure 5 This is a schematic diagram of a band-stop TFF involved in an embodiment of this application.

[0084] Figure 6 This is a schematic diagram of a WDM device based on a band-stop TFF provided in an embodiment of this application.

[0085] Figure 7 This is another structural schematic diagram of the WDM device provided in the embodiments of this application.

[0086] Figure 8 This is another structural schematic diagram of the WDM device provided in the embodiments of this application.

[0087] Figure 9 This is another structural schematic diagram of the dual-density WDM device provided in the embodiments of this application.

[0088] Figure 10 This is another structural schematic diagram of the TFF involved in the embodiments of this application.

[0089] Figure 11 This is another schematic diagram of the structure of a WDM device based on a bandpass TFF provided in the embodiments of this application.

[0090] Figure 12 This is another structural schematic diagram of a WDM device based on a bandpass TFF provided in the embodiments of this application.

[0091] Figure 13 This is another structural schematic diagram of a WDM device based on a bandpass TFF provided in the embodiments of this application.

[0092] Figure 14 This is another schematic diagram of the structure of the WDM device based on the band-stop TFF provided in the embodiments of this application. Detailed Implementation

[0093] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0094] The technical solutions of this application can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, 5th Generation (5G) systems, New Radio (NR) systems, Wireless Local Area Network (WLAN) systems, Broadcasting / Television Service (BTS) systems, or future next-generation communication systems, etc.

[0095] The access network device in this application embodiment can be a device used to communicate with terminal devices. The access network device can also be called an access device or a wireless access network device. It can be an evolved NodeB (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (CRAN) scenario. Alternatively, the access network device can be a relay station, access point, vehicle-mounted device, wearable device, or access network device in a 5G network or an access network device in a future evolved PLMN network. It can be an access point (AP) in a WLAN, a node in a BTS, or a gNB in ​​a new radio (NR) system. This application embodiment is not limited to these.

[0096] Furthermore, in the embodiments of this application, the access network device is a device in the radio access network (RAN), or in other words, a RAN node that connects the terminal device to the wireless network. For example, by way of example and not limitation, the following can be listed as access network devices: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), base band unit (BBU), or wireless fidelity (Wi-Fi) access point (AP), etc. In a network architecture, the access network equipment can be a RAN device that includes centralized unit (CU) nodes and distributed unit (DU) nodes, or a RAN device that includes control plane CU nodes (CU-CP nodes), user plane CU nodes (CU-UP nodes), and DU nodes.

[0097] Access network equipment provides services to cells. Terminal devices communicate with access network equipment through the transmission resources (e.g., frequency domain resources, or spectrum resources) used by the cell. The cell can be the cell corresponding to the access network equipment (e.g., base station). The cell can belong to a macro base station or the base station corresponding to a small cell. The small cells here can include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0098] The core network equipment in this application refers to equipment in the core network (CN) that provides service support for terminal equipment. Examples of core network equipment include: access and mobility management function (AMF) entities, session management function (SMF) entities, user plane function (UPF) entities, etc., which will not be listed here. For example, the AMF entity can be responsible for terminal access management and mobility management; the SMF entity can be responsible for session management, such as user session establishment; the UPF entity can be a user plane function entity, mainly responsible for connecting to external networks.

[0099] It should be noted that in this application, an entity can also be referred to as a network element or a functional entity. For example, an AMF entity can also be referred to as an AMF network element or an AMF functional entity, and an SMF entity can also be referred to as an SMF network element or an SMF functional entity, etc.

[0100] The technical solutions of this application can be applied to optical fiber communication in communication systems, including but not limited to: optical fiber communication between access network devices, optical fiber communication between access network devices and core network devices, optical fiber communication between CU nodes and DU nodes, optical fiber communication between core network devices, and optical fiber communication between the BBU and radio unit (RU) of the access network device.

[0101] Wavelength division multiplexing (WDM) is a technology that combines multiple optical signals of different wavelengths using a multiplexer and couples them into the same optical fiber for data transmission. WDM combines two or more optical carrier signals of different wavelengths (carrying various information) at the transmitting end using a multiplexer and couples them into the same optical fiber for transmission. At the receiving end, a demultiplexer separates the various wavelengths of the optical carriers, and then the optical receiver performs further processing to recover the original signal. WDM features high capacity, long distance, and low cost. High capacity means that the light in the optical fiber is composed of multiple wavelengths, each of which can independently carry different information, thus allowing for the transmission of more information. Long distance means that the optical transmission loss is much lower than the electrical loss. Low cost refers to the low manufacturing cost of the optical fiber. WDM can be divided into dense wavelength division multiplexing (DWDM) and sparse wavelength division multiplexing (CWDM). In DWDM systems, the spacing between each wavelength is relatively small, such as 0.8nm, 0.4nm, or 0.2nm, while CWDM has a larger spacing, typically 20nm. Currently, DWDM is the mainstream technology. The number of optical wavelengths that a single optical fiber can transmit can be one of the following: 32, 40, 80, 96, 106, or 160. Currently, the mainstream applications are 40-wavelength and 80-wavelength systems.

[0102] A Small Pluggable Module (SFP) is an optical module that performs photoelectric conversion, i.e., modulating an electrical signal onto a light wave to obtain an optical signal, and / or demodulating an electrical signal from an optical signal. Both a single-wavelength optical signal output from the SFP and a single-wavelength optical signal input to the SFP are transmitted on an optical fiber. To improve transmission efficiency, WDM can be used to combine the single-wavelength signal output from the SFP and the single-wavelength signal input to the SFP into a single-wavelength multi-wavelength signal for transmission.

[0103] Currently, dual small form-factor pluggable (DSFP) modules have entered industrial applications due to their similar packaging to small form-factor pluggable (SFP) modules and the advantage of providing dual-channel interfaces. Limited by the fiber density supported by the SFP packaging, DSFP currently supports dual-channel single-fiber bidirectional, i.e., BiDi (BiDirectional) optical signal processing.

[0104] Figure 1A schematic diagram of a WDM structure connected to a BiDi-DSFP is shown. In this diagram, a three-channel BiDi-DSFP is used as an example. The three BiDi-DSFP devices process six wavelength signals, λ1 to λ6. Taking CWDM as an example, the wavelengths of λ1 to λ6 are 1270nm, 1290nm, 1310nm, 1330nm, 1350nm, and 1370nm, respectively. Each BiDi-DSFP device processes two signals with two wavelengths each. For example, the first BiDi-DSFP processes two signals, each including λ1 and λ4; the second BiDi-DSFP processes two signals, each including λ2 and λ5; and the third BiDi-DSFP processes two signals, each including λ3 and λ6. To combine the six signals, each with two wavelengths, processed by these three BiDi-DSFP devices into two signals, each with six wavelengths... Figure 1 The WDM structure shown employs six 1-to-2 WDM devices and two 6-to-1 WDM devices. The three 1-to-2 WDM devices acquire six signals processed by the single 6-to-1 WDM device. These six signals have wavelengths λ1 to λ6. It is understood that the arrows in the accompanying drawings indicate wave merging and do not represent the transmission direction of the signals carried by the light waves. The signals carried by the light waves can be in the same direction, or some can be in opposite directions. For example, the signals carried on λ1 and λ4 can be in opposite directions, which is not limited here.

[0105] As you can see, Figure 1 The proposed solution requires multiple WDM devices to form a WDM structure. For example, in addition to two 6-in-1 WDM devices, six 1-to-2 WDM devices are also needed, resulting in higher costs, greater link insertion loss, and more complex link configuration, increasing manual configuration costs. Furthermore, current WDM devices cannot support the multiplexing of multiple (also known as multi-channel or multi-wavelength) single-fiber optical signals using a single WDM device, such as the dual (also known as dual-channel) single-fiber multidirectional optical signals of a DSFP.

[0106] In view of this, embodiments of this application propose various WDM devices to enable a single WDM device to support the multiplexing of multiple single-fiber, multi-wavelength optical signals. It is understood that multiplexing and wavelength division are two inverse processes. The WDM devices provided in these embodiments can also support wavelength division of a single-fiber, multi-wavelength optical signal into multiple single-fiber, multi-wavelength optical signals. The following embodiments only describe multiplexing as an example; wavelength division can be obtained from the inverse process of multiplexing and will not be elaborated further. The WDM devices provided in these embodiments can reduce the processing cost of optical signals, reduce link insertion loss, and reduce the complexity of link configuration, thereby reducing manual configuration costs.

[0107] like Figure 2 The diagram shown is a schematic structural diagram of a WDM device provided in an embodiment of this application.

[0108] The WDM device uses a band-stop filter that reflects only wavelengths within a specific range and transmits wavelengths outside that range.

[0109] Figure 2 The following description uses an example of a single-fiber multi-wavelength signal processed by the WDM device, comprising N channels, each channel containing M wavelengths, with each pair of M wavelengths offset by N wavelengths. Through the multiplexing processing of the WDM device, single-fiber multi-wavelength signals with wavelengths from λ1 to λM*N can be obtained. Here, M is a positive integer greater than or equal to 2, and N is a positive integer greater than or equal to 2.

[0110] For example, when the WDM device implements CWDM, it can include three single-fiber multi-wavelength signals, each including wavelengths λ1 and λ4, λ2 and λ5, and λ3 and λ6, respectively.

[0111] The WDM device may include:

[0112] The first incident port group 103 includes N first incident ports 1003;

[0113] There are N band-stop filter groups 101, and each of the N band-stop filter groups 101 includes M band-stop filters 1001.

[0114] The first low-pass or high-pass filter group 102 includes M low-pass or high-pass filters 1002, wherein each of the M filters can be either a low-pass filter or a high-pass filter, which is not limited here; and

[0115] The first public port is 104.

[0116] Each single-fiber multi-wavelength signal comprises M wavelengths that are located within the stopband range of the M band-stop filters 1001 used to process that single-fiber multi-wavelength signal. Thus, by sequentially passing the single-fiber multi-wavelength signal through the M band-stop filters 1001, the single-fiber multi-wavelength signal can be divided into M single-wavelength signals.

[0117] In this setup, M band-stop filters 1001 in the N-channel band-stop filter group are also correspondingly configured. That is, a single-wavelength signal from each single-fiber multi-wavelength signal is passed through the corresponding band-stop filter 1001 in another channel to obtain a signal with N wavelengths. For example, a single-wavelength signal from the first single-fiber multi-wavelength signal, λ1, is passed through a band-stop filter 1001 in the second channel and combined with a single-wavelength signal from the second single-fiber multi-wavelength signal, λ2, to obtain a multi-wavelength signal, λ1 and λ2. Then, this multi-wavelength signal is passed through a band-stop filter 1001 in the third channel and combined with a single-wavelength signal from the third single-fiber multi-wavelength signal, λ3, to obtain a multi-wavelength signal, λ1, λ2, and λ3, and so on, to obtain a signal with N wavelengths, λ1 to λN. Thus, a total of M signals, each with N wavelengths, are obtained.

[0118] The M low-pass or high-pass filters 1002 in the first low-pass or high-pass filter group 102 are also correspondingly arranged with the M band-stop filters 1001 in each of the aforementioned band-stop filter groups, so as to reflect the input light wave into the next low-pass or high-pass filter 1002 in sequence, thereby obtaining a single signal with M*N wavelengths, and inputting the single signal with M*N wavelengths into the first common port 104.

[0119] Optional, in such Figure 2 In the WDM device shown, the first low-pass or high-pass filter 1002-1 in the first low-pass or high-pass filter group 102, that is, the first low-pass or high-pass filter set corresponding to the band-stop filter that separates the first single-wavelength signal in each of the M band-stop filters 1001, is a total reflection filter.

[0120] pass Figure 2 The WDM device shown can combine multiple single-fiber multi-wavelength signals into a single single-fiber multi-wavelength signal using a single WDM device, thereby reducing the processing cost of optical signals, reducing link insertion loss, and reducing the complexity of link configuration, thus reducing manual configuration costs.

[0121] The number of wavelengths included in the N single-fiber multi-wavelength signals processed by the WDM device in this application embodiment can be determined independently. That is, the number of wavelengths can be the same or different, and the wavelength values ​​included in the N single-fiber multi-wavelength signals can also be determined independently. For example, the number of wavelengths and wavelength values ​​can be determined based on system setting requirements, which are not limited here.

[0122] Therefore, based on the foregoing Figure 2 The principle of the WDM device described herein can be used to provide a more general WDM device through the embodiments of this application.

[0123] The WDM device may include:

[0124] At least two first incident ports, at least two band-stop filter groups, a first low-pass or high-pass filter group, and a first common port;

[0125] The at least two first incident ports include first incident port I. 1,1 and the first incident port I 1,2 The first incident port I 1,1 The first input port I is used to input a first input signal M1 having X1 wavelengths. 1,2 Used to input the second channel's first input signal N1 with Y1 wavelengths;

[0126] The at least two sets of band-stop filter groups include a first band-stop filter group and a second band-stop filter group.

[0127] The X1 first band-stop filters in the first band-stop filter group are used to split the incident first input signal M1 with X1 wavelengths into X1 single-wavelength signals. 1,1 To signal M 1,X1 Wherein, the X1 wavelength includes the Eth wavelength. 1,1 wavelength up to E 1,X1 Wavelength, the X1 single-wavelength signal, signal M 1,1 To signal M 1,X1 One-to-one correspondence with the Eth 1,1 wavelength up to E 1,X1 Wavelength, the Eth 1,1 wavelength up to E 1,X1 The wavelengths are respectively located within the stopband range of the X1 first band-stop filters, and the i1th first band-stop filter among the X1 first band-stop filters is used to reflect the Eth wavelength. 1,i1 Wavelength signal M 1,i1 And transmit the signal of the first other wavelength input to the i1th first band-stop filter, where X1 is an integer greater than 1, i1 is an integer from 1 to X1, and the first other wavelength belongs to the Eth band-stop filter. 1,1 wavelength up to E 1,X1 wavelength;

[0128] The Y1 second band-stop filters in the second band-stop filter group are used to split the incident second first input signal N1 with Y1 wavelengths into Y1 single-wavelength signals. 1,1 To signal N 1,Y1 Wherein, the Y1 wavelength includes the Fth wavelength. 1,1 wavelength up to F 1,Y1 Wavelength, the Y1 channel single-wavelength signal, signal N1,1 To signal N 1,Y1 One-to-one correspondence with the Fth 1,1 wavelength up to F 1,Y1 Wavelength, the Fth 1,1 wavelength up to F 1,Y1 The wavelengths are respectively located within the stopband range of the corresponding second band-stop filters in the Y1 second band-stop filters, and the j1th second band-stop filter in the Y1 second band-stop filters is used to reflect the Fth second band-stop filter. 1,j1 Wavelength signal N 1,j1 And transmit the signal of the second other wavelength input to the j1th second band-stop filter, where Y1 is an integer not less than 1, j1 is an integer from 1 to Y1, and the second other wavelength belongs to the Fth... 1,1 wavelength up to F 1,Y1 wavelength;

[0129] The W1 second band-stop filters in the second band-stop filter group are also used to filter the X1 single-wavelength signals, signal M. 1,1 To signal M 1,X1 The signals are sequentially compared with the single-wavelength signals of the Y1 channel, and the signal N. 1,1 To signal N 1,Y1 Combined signals to obtain the W1 multi-wavelength signal T. 1,t1＝1…W1 W1 is the larger of X1 and Y1. When X1 is greater than Y1, the W1 second band-stop filters include the Y1 second band-stop filters. When X1 is less than Y1, the W1 second band-stop filters are a portion of the Y1 second band-stop filters. When X1 is equal to Y1, the W1 second band-stop filters are the Y1 second band-stop filters. The j1th second band-stop filter among the Y1 second band-stop filters is also used to transmit the signal M input to the j1th second band-stop filter. 1,i1 To obtain multi-wavelength signal T 1,t1 The multi-wavelength signal T 1,t1 Having the Eth 1,i1 Wavelength and the Fth 1,j1 Wavelength, where t1 is an integer from 1 to W1;

[0130] The first low-pass or high-pass filter group includes Z1 first low-pass or high-pass filters and is used to filter Z1 multi-wavelength signals P 1,k1＝1…Z1 The Z1 multi-wavelength signal P is obtained by combining the signals to obtain a single-channel multi-wavelength output signal Q1. 1,k1＝1…Z1 The W1 multi-wavelength signal P 1,t1＝1…W1 The t1 multi-wavelength signal P in 1,t1 Including the W1 multi-wavelength signal T 1,t1＝1…W1 The t1 multi-wavelength signal T in 1,t1The Z1 first low-pass or high-pass filters include W1 first low-pass or high-pass filters, and the W1 multi-wavelength signals P 1,t1＝1…W1 Located within the stopband range of the corresponding first low-pass or high-pass filter among the W1 first low-pass or high-pass filters, the t1th first low-pass or high-pass filter among the W1 first low-pass or high-pass filters is used to reflect the t1th multi-wavelength signal P. 1,t1 And transmit signals of other wavelengths input to the t1th low-pass or high-pass filter, where k1 is an integer from 1 to Z1, and Z1 is an integer greater than or equal to W1;

[0131] The first common port is used to output the single-channel multi-wavelength output signal Q1 obtained by the first low-pass or high-pass filter group.

[0132] It is understandable that when X1 = Y1 = Z1 = W1 = M, the Eth wavelength of X1 is included. 1,1 wavelength up to E 1,X1 The wavelengths are λ1, λ1+N, ..., λ1+(M-1)*N, and the F-th wavelength of Y1 is included. 1,1 wavelength up to F 1,Y1 With wavelengths of λ2, λ2+N, ..., λ2+(M-1)*N, the WDM device is as follows: Figure 2 The WDM device shown.

[0133] like Figure 2 The aforementioned WDM device can only obtain one signal with M*N wavelengths, i.e., λ1 to λM*N. This application further proposes a dual-density WDM device that multiplexes N band-stop filter groups 101, thereby enabling its use with a BiDi-DSFP, i.e., connecting to a BiDi-DSFP device to obtain two signals with M*N wavelengths.

[0134] like Figure 3 The diagram shown is a schematic structural diagram of a WDM device, namely a dual-density WDM device, proposed in an embodiment of this application.

[0135] In such Figure 2 Based on the WDM device shown, the WDM device may further include a second incident port group 103', a second low-pass or high-pass filter group 102', and a second common port 104'.

[0136] The second low-pass or high-pass filter group 102' may have M second low-pass or high-pass filters 1002', and the second incident port group 103' includes N second incident ports 1003'.

[0137] Figure 3The WDM device shown is described using the example of the light waves input to the N second incident ports 1003' being the same as the light waves input to the N first incident ports 1003.

[0138] The N band-stop filter groups 101 in this WDM device also process the N single-fiber multi-wavelength signals input through the second incident port group 103'. The processing procedure is the same as that for processing the N single-fiber multi-wavelength signals input through the first incident port group 103, to obtain M signals, each with N wavelengths. The specific processing procedure will not be described in detail here.

[0139] M second low-pass or high-pass filters 1002' and Figure 2 The M first low-pass or high-pass filters 1002 in the middle have the same function, and reflect the input light wave into the next low-pass or high-pass filter 1002' in turn, thereby obtaining a single signal with M*N wavelengths, and inputting the single signal with M*N wavelengths into the second common port 104'.

[0140] Optional, in such Figure 3 In the WDM device shown, the first second low-pass or high-pass filter 1002'-1 in the second low-pass or high-pass filter group 102', that is, the second low-pass or high-pass filter set corresponding to the band-stop filter that separates the first single-wavelength signal in each of the M band-stop filters 1001, is a total reflection filter.

[0141] This WDM device enables the merging of dual-density multi-channel single-fiber multi-wavelength signals into a single-channel single-fiber multi-wavelength signal, or the separation of dual-density single-channel single-fiber multi-wavelength signals into multiple single-fiber multi-wavelength signals. This further reduces the processing cost of optical signals, reduces link insertion loss, and reduces the complexity of link configuration, thereby reducing manual configuration costs.

[0142] As mentioned above, Figure 3 The WDM device shown is described using the example of the light waves input to the N second incident ports 1003' being the same as the light waves input to the N first incident ports 1003.

[0143] Based on the foregoing Figure 2 and Figure 3 Based on the principle of the WDM device described above, the embodiments of this application can provide a more general dual-density WDM device.

[0144] The dual-density WDM device is mentioned above. Figure 2 Based on the more general WDM device provided in the illustrated embodiments, it further includes:

[0145] At least two second incident ports, a second low-pass or high-pass filter array, and a second common port;

[0146] The at least two second incident ports include a second incident port I. 2,1 and the first incident port I 2,2 The first incident port I 2,1 The first incident port I is used to input a second input signal M2 with X2 wavelengths. 2,2 Used to input the second input signal N2 with Y2 wavelengths;

[0147] The X2 first band-stop filters in the first band-stop filter group are further used to split the X2 wavelengths of the incident first second input signal M2 with X3 wavelengths into X2 single-wavelength signals, signal M 2,1 To signal M 2,X2 Wherein, the X2 wavelengths include the Eth wavelength. 2,1 wavelength up to E 2,X2 Wavelength, the X2 single-wavelength signal, signal M 2,1 To signal M 2,X2 One-to-one correspondence with the Eth 2,1 wavelength up to E 2,X2 Wavelength, the Eth 2,1 wavelength up to E 2,X2 The wavelengths are respectively located within the stopband range of the X2 first band-stop filters, and the i1th first band-stop filter among the X1 first band-stop filters is also used to reflect the Eth wavelength. 2,i1 Wavelength signal M 2,i1 And transmit the signal of a third other wavelength into the i1th first band-stop filter, where X2 is an integer not less than 1 and not greater than X1, and the third other wavelength belongs to the Eth... 2,1 wavelength up to E 2,X2 Wavelength, where X3 is an integer greater than or equal to X2;

[0148] The Y2 second band-stop filters in the second band-stop filter group are further used to divide the Y2 wavelengths of the incident second input signal N2 with Y3 wavelengths into Y2 single-wavelength signals, signal N 2,1 To signal N 2,Y2 The Y2 wavelengths include the Fth wavelength. 2,1 wavelength up to F 2,Y2 Wavelength, the Y2 single-wavelength signal, signal N 2,1 To signal N 2,Y2 One-to-one correspondence with the Fth 2,1 wavelength up to F 2,Y2 Wavelength, the Fth 2,1 wavelength up to F 2,Y2The wavelengths are respectively located within the stopband range of the corresponding second band-stop filters in the Y2 second band-stop filters, and the j1th second band-stop filter in the Y1 second band-stop filters is also used to reflect the Fth second band-stop filter. 2,j1 Wavelength signal N 2,j1 And transmit the signal of the fourth other wavelength input to the j1th second band-stop filter, the fourth other wavelength belonging to the Fth 2,1 wavelength up to F 2,Y2 Wavelength, where Y2 is an integer not less than 1 and not greater than Y1, and Y3 is an integer greater than or equal to Y2;

[0149] The W2 first band-stop filters in the first band-stop filter group are also used to filter the Y2 single-wavelength signals, signal N. 2,1 To signal N 2,X2 The signals are sequentially compared with the X2 single-wavelength signals, signal M. 2,1 To signal M 2,Y1 Combined signals to obtain the W2 multi-wavelength signal T. 2,t2＝1…W2 W2 is the larger of X2 and Y2. When X2 is greater than Y2, the W2 second band-stop filters include the X2 first band-stop filters. When X2 is less than Y2, the W2 second band-stop filters are a portion of the X2 first band-stop filters. When X2 equals Y2, the W2 second band-stop filters are the X2 first band-stop filters. The i1th first band-stop filter among the X1 first band-stop filters is also used to transmit the signal N input to the i1th first band-stop filter. 2,j1 To obtain multi-wavelength signal T 2,t2 The multi-wavelength signal T 2,t2 Having the Eth 2,i1 Wavelength and the Fth 2,j1 Wavelength, where t2 is an integer from 1 to W2;

[0150] The second low-pass or high-pass filter group includes Z2 first low-pass or high-pass filters and is used to filter Z2 multi-wavelength signals P 2,k2＝1…Z2 The Z2 multi-wavelength signals are combined to obtain a single-channel multi-wavelength output signal Q2, and the Z2 multi-wavelength signals P 2,k2＝1…Z2 The W2 multi-wavelength signal P 2,t2＝1…W2 The t2 multi-wavelength signal P in 2,t2 Including the W2 multi-wavelength signal T 2,t2＝1…W2 The t2 multi-wavelength signal T in 2,t2 The Z2 first low-pass or high-pass filters include W2 first low-pass or high-pass filters, and the W2 multi-wavelength signals P 2,t1＝1…W2Located within the stopband range of the corresponding first low-pass or high-pass filter among the W2 first low-pass or high-pass filters, the t2th first low-pass or high-pass filter among the W2 first low-pass or high-pass filters is used to reflect the t2th multi-wavelength signal P. 2,t2 And transmit signals of other wavelengths input to the t2th low-pass or high-pass filter, where k2 is an integer from 1 to Z2, and Z2 is an integer greater than or equal to W2;

[0151] The second common port is used to output the single-channel multi-wavelength output signal Q2 obtained by the second low-pass or high-pass filter group.

[0152] It is understandable that when X3 = X2 = Y3 = Y2 = Z2 = W2 = M, and the Eth wavelength included in X2 is... 2,1 wavelength up to E 2,X2 Wavelengths are λ1, λ1+N, ..., λ1+(M-1)*N, and the Fth wavelength is... 2,1 wavelength up to F 2,Y2 With wavelengths of λ2, λ2+N, ..., λ2+(M-1)*N, this dual-density WDM device is as follows: Figure 3 The dual-density WDM device shown.

[0153] Based on such Figure 2 Or such as Figure 3 The present application also provides a WDM device based on Z-Block, in addition to the structure of the WDM device shown.

[0154] like Figure 4 The diagram shown is a schematic of a Z-Block-based WDM device provided in an embodiment of this application.

[0155] This WDM device is based on, for example Figure 2 Or such as Figure 3 The WDM device shown is described using the example of N single-fiber multi-wavelength signals, each including two wavelengths.

[0156] The WDM device may include:

[0157] Z-Block structure.

[0158] The Z-Block structure has N isosceles right-angled triangular prism-shaped notches on each side. The right-angled faces of the isosceles right-angled triangular prisms are perpendicular to the notches. The inclined planes of the isosceles right-angled triangular prisms on the same side are parallel. The notches on both sides are equidistant and their inclined planes are also parallel. The notch on the first side includes a notch for the first incident port 1003. The notch on the second side includes a notch for the first common port 104, a notch for the first incident port 1003, and the end opposite to the notch for the first incident port. Each of the notches is provided with a first triangular prism filter, the inclined surface of which is coated with a band-stop filter film. A second triangular prism filter is provided in both the notch for the first common port and the notch opposite to the notch for the first common port. The inclined surface of the second triangular prism filter is coated with a first low-pass or high-pass filter film. The band-stop filter film is the band-stop filter 1001 included in the at least two band-stop filter groups, and the first low-pass or high-pass filter film is the low-pass or high-pass filter 1002 included in the first low-pass or high-pass filter group.

[0159] Optionally, the first low-pass or high-pass filter film coated on the inclined surface of the second triangular prism filter provided in the notch opposite to the notch for the first common port is used for total internal reflection, that is, the first first low-pass or high-pass filter 1002-1.

[0160] Optionally, the notch opposite to the notch for the first incident port is also used for the second incident port 1003'. The notch on the first side also includes a notch for the second common port 104'. A third triangular prism filter is provided within both the notch for the second common port and the notch opposite to the notch for the second common port. The inclined surface of the third triangular prism filter is coated with a second low-pass or high-pass filter film, which is the low-pass or high-pass filter 1002' included in the second low-pass or high-pass filter group. This allows for the realization of a dual-density WDM device, aiming to further reduce the processing cost of optical signals, reduce link insertion loss, and reduce the complexity of link configuration, thereby reducing manual configuration costs.

[0161] Optionally, a second low-pass or high-pass filter film coated on the inclined surface of the third triangular prism filter provided in the notch opposite to the notch for the second common port is used for total internal reflection, i.e., the first second low-pass or high-pass filter 1002'-1.

[0162] above Figure 4 The WDM device shown is implemented based on a Z-Block structure. This application also provides a WDM device based on a thin-film filter (TFF).

[0163] One example is a schematic diagram of a TFF (Transient Flip Filter) used for band-stop filtering, as shown below. Figure 5 As shown.

[0164] The TFF includes four ports: port a, port b, port c, and port d.

[0165] Optionally, the TFF may include a sleeve and two fiber collimators;

[0166] The band-stop filter 1001 is fixed inside the TFF. Optionally, it can be located between the two fiber collimators of the TFF.

[0167] Taking a single multi-wavelength signal with wavelengths λ1 to λ6 as input at port a of the TFF, and the band-stop filter 1001 reflecting wavelength λ1 and transmitting other wavelengths as an example, port b outputs a single multi-wavelength signal with wavelength λ1, and port d outputs signals with wavelengths λ2 to λ6.

[0168] Optionally, the TFF can also perform wavelength division processing on another multi-wavelength signal. For example, if port c inputs a single multi-wavelength signal with wavelengths λ1 to λ6, then port d outputs a single multi-wavelength signal with wavelength λ1, and port b outputs a signal with wavelengths λ2 to λ6.

[0169] Based on such Figure 5 The TFF shown, and the WDM device provided in the embodiments of this application, are as follows: Figure 6 As shown.

[0170] The WDM device includes N band-stop TFF groups 101, corresponding to the aforementioned Figure 2 or Figure 3 The band-stop filter group 101 is included. Each TFF group includes M band-stop TFF1001, corresponding to the aforementioned... Figure 2 or Figure 3 The band-stop filter 1001 is used in this process.

[0171] The WDM device also includes a TFF group 102, such as a first low-pass or high-pass TFF group 102, corresponding to the aforementioned Figure 2 or Figure 3 The first low-pass or high-pass filter group 102 in the [structure / process]. This first low-pass or high-pass TFF group 102 includes M first low-pass or high-pass TFFs 1002, each corresponding to the aforementioned [specific type / component]. Figure 2 or Figure 3 The first low-pass or high-pass filter 1002 in the M first low-pass or high-pass TFF1002 is fixedly installed.

[0172] Optionally, the WDM device may further include a TFF group 102', such as a second low-pass or high-pass TFF group 102', respectively corresponding to the aforementioned Figure 2 or Figure 3 The second low-pass or high-pass filter group 102' in the process. This second low-pass or high-pass TFF group 102' includes M second low-pass or high-pass TFFs 1002', each corresponding to the aforementioned... Figure 2 or Figure 3 The first low-pass or high-pass filter 1002' in the middle, that is, the second low-pass or high-pass filter 1002' is fixed in the M second low-pass or high-pass TFF1002'.

[0173] The connection relationships of the TFFs included in this WDM device, such as Figure 6As shown, in each column of the N-channel band-stop TFF group 101, i.e., the v-th row, the port a of the band-stop TFF receives a signal with multiple wavelengths, for example, the multiple wavelengths include one or more combinations of λv, λv+N, ..., λv+(M-1)*N, v∈{1,2,...,N}, where M and N are integers greater than or equal to 2, and outputs a signal with multiple wavelengths from port b, for example, the multiple wavelengths include one or more combinations of λv, λv+1, λv+2, ..., λv+(N-1), v∈{1,2,...,N}. The port d of the v-th band-stop TFF is connected to the... The next band-stop TFF in the row of the v-th band-stop TFF, for example, if the v-th band-stop TFF is located in the u-th column, then the next band-stop TFF is the band-stop TFF in the (u+1)-th column. The ports a are connected to each other to input the wavelengths of λv, λv+N, ..., λv+(M-1)*N, v∈{1,2,...,N}, M and N are integers greater than or equal to 2, excluding the wavelengths located within the stopband range of the band-stop TFF in the v-th row and u-th column, for example, λv+(u-1)*N, u is an integer from 1 to M. Port b of the band-stop TFF in row v and column u is connected to port c of the band-stop TFF in row v+1 of the same column, so that the band-stop TFF in row N of column u outputs a signal with multiple wavelengths λv to λv+(N-1) to the first low-pass or high-pass TFF group 102. For example, it can be input to port a or port c of the first low-pass or high-pass TFF 1002 in the first low-pass or high-pass TFF group 102. For example, when u=1, port a of the first low-pass or high-pass TFF 1002 is used, and when u≠1, port c of the first low-pass or high-pass TFF 1002 is used. Port d of the u-th first low-pass or high-pass TFF1002 is connected to port a of the (u+1)-th first low-pass or high-pass TFF1002, so that port d of the last first low-pass or high-pass TFF1002, i.e., the M-th first low-pass or high-pass TFF1002 corresponding to the TFF that separates multiple wavelengths λv, λv+N, ..., λv+(M-1)*N, v∈{1,2,...,N}, outputs a signal with multiple wavelengths λ1 to λM*N at port d. Here, λ1 to λN are located in the passband range of the 1st first low-pass or high-pass TFF1002, and λ1+N to λN+N are located in the stopband range of the u-th first low-pass or high-pass TFF1002. λ1 to λN*u are located in the passband range of the u-th first low-pass or high-pass TFF1002, and λ1+N*u to λN+N*u are located in the stopband range of the u-th first low-pass or high-pass TFF1002.Similarly, λ1 to λN*(M-1) are located in the passband range of the Mth first low-pass or high-pass TFF1002, and from the Mth first low-pass or high-pass TFF1002, λ1+N*(M-1) to λN+N*(M-1) are located in the stopband range of the Mth first low-pass or high-pass TFF1002, so that the port d of the Mth first low-pass or high-pass TFF1002 outputs a signal with wavelengths λ1 to λN*M.

[0174] Optionally, when the WDM device includes the aforementioned second low-pass or high-pass TFF group 102', the port d of the Mth band-stop TFF 1001 of each of the N-channel band-stop TFF groups 101 of the WDM device can also input multi-wavelength signals, such as wavelengths λv, λv+N, ..., λv+(M-1)*N, v∈{1,2,...,N}, where M and N are integers greater than or equal to 2. The port c of each band-stop TFF in the N-channel band-stop TFF group is also used to output signals of the corresponding wavelength, that is, in the N-channel band-stop TFF group... Each band-stop TFF is also multiplexed for multiplexing and splitting processing in the opposite direction to the aforementioned, so that the first row of the u-th column of the band-stop TFF outputs a signal with multiple wavelengths λv to λv+(N-1) to the second low-pass or high-pass TFF group 102', for example, input to the port d or port b of the u-th second low-pass or high-pass TFF 1002' in the second low-pass or high-pass TFF group 102', for example, when u=M, port d of the second low-pass or high-pass TFF 1002', and when u≠M, port b of the second low-pass or high-pass TFF 1002'. Port a of the uth second low-pass or high-pass TFF1002' is connected to port d of the (u-1)th second low-pass or high-pass TFF1002', so that port a of the first second low-pass or high-pass TFF1002', that is, the first first low-pass or high-pass TFF1002' set with the first wavelength of the TFF that separates multiple wavelengths λv, λv+N, ..., λv+(M-1)*N, v∈{1,2,...,N}, outputs a signal with multiple wavelengths λ1 to λM*N.

[0175] By using the above TFF-based WDM devices, the processing cost of optical signals can be reduced, the insertion loss of links can be reduced, and the complexity of link configuration can be reduced, thereby reducing manual configuration costs.

[0176] The above are as follows Figures 2 to 6 The embodiments of the above are all based on band-stop filters to realize WDM devices. The embodiments of this application also provide a WDM device based on a band-pass filter.

[0177] like Figure 7 As shown, the WDM device may include:

[0178] At least two first incident ports 203, at least one combined branch structure and a first common port 204;

[0179] The at least one combined branch structure includes a first combined branch structure 201-1;

[0180] The first combining / splitting structure 201-1 includes two bandpass filters 2001, namely a first bandpass filter and a second bandpass filter, and two low-pass or high-pass filter structures or two total reflection structures, such as a first total reflection structure 2002 and a second total reflection structure 2002.

[0181] The bandpass filter is used to transmit wavelengths within a specific range and reflect wavelengths outside that specific range.

[0182] Optionally, the two bandpass filters 2001 are located diagonally opposite each other, and the two total internal reflection structures 2002 are located diagonally opposite each other.

[0183] Taking wavelengths λ1, λ2, λ4, and λ5 as an example, the first bandpass filter 2001 of the two bandpass filters 2001 is used to transmit one of wavelengths λ2 and λ5, such as λ2, and reflects the other as well as the incident wavelengths λ1 and λ4, where wavelengths λ1 and λ4 can come from the first incident port 203; the second bandpass filter 2001 of the two bandpass filters 2001 is used to transmit another wavelength of wavelengths λ2 and λ5 that is different from the wavelength transmitted by the first bandpass filter 2001, such as λ5, and reflects the wavelength transmitted by the first bandpass filter 2001, such as λ2, as well as wavelengths λ1 and λ4; the two total internal reflection structures 2002 are respectively used to reflect signals from the two bandpass filters 2001, so that signals with wavelengths λ1, λ2, λ4, and λ5 can be obtained at the first common port 204.

[0184] Optionally, wavelengths λ1, λ2, λ4, λ5 are the same as those in the aforementioned CWDM.

[0185] A more general description of this solution is provided below:

[0186] The at least two first incident ports include first incident port I 1,1 and the first incident port I 1,2 The first incident port I 1,1 The first input channel has two wavelengths, E. 1,1 Wavelength and E 1,2 The first input signal M1 with wavelength, and the first incident port I 1,2 The second input channel has two wavelengths, F. 1,1 Wavelength and F 1,2 The first input signal N1 with wavelength;

[0187] The two bandpass filters include a first bandpass filter 2001 and a second bandpass filter 2001;

[0188] The two total reflection structures include a first total reflection structure 2002 and a second total reflection structure 2002;

[0189] The first bandpass filter 2001 is used to transmit light from the first incident port I. 1,1 The Eth wave of the incident first path input signal M1 with two wavelengths 1,2 wavelength and reflect the Eth 1,1 wavelength;

[0190] The first bandpass filter 2001 is also used to reflect light from the first incident port I. 1,2 The Fth wave in the incident second path input signal N1 with two wavelengths 1,1 Wavelength and the Fth 1,2 wavelength;

[0191] The first total internal reflection structure 2002 is used to reflect the Eth element from the first bandpass filter. 1,1 wavelength;

[0192] The second total internal reflection structure 2002 is used to reflect the Eth element from the first bandpass filter. 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength;

[0193] The second bandpass filter 2001 is used to transmit the Eth element from the first total internal reflection structure. 1,1 wavelength and reflect the Eth 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength;

[0194] The first common port 204 is used to output a single-channel multi-wavelength signal Q1, the wavelength of which includes the Eth wavelength. 1,1 Wavelength, the Eth 1,2 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength.

[0195] Understandably, in the more general scheme described above, the Eth... 1,1 Wavelength and E 1,2 Wavelengths respectively correspond to, for example Figure 7 The wavelengths λ2 and λ5 in the Fth wavelength range 1,1 Wavelength and F 1,2 Wavelengths respectively correspond to, for example Figure 7Wavelengths λ1 and λ4. The first bandpass filter corresponds to... Figure 7 The bandpass filter in the upper left corner, the second bandpass filter corresponds to... Figure 7 The bandpass filter in the lower right corner.

[0196] The WDM device provided in the above embodiments can be used to combine two dual-wavelength signals, that is, to obtain a signal with four wavelengths, thereby reducing the processing cost of optical signals, reducing link insertion loss, and reducing the complexity of link configuration, thus reducing manual configuration costs.

[0197] Furthermore, the embodiments of this application are based on the above. Figure 7 Based on the WDM device shown, it can be further extended to combine three dual-wavelength signals into one six-wavelength signal.

[0198] like Figure 8 As shown, based on Figure 7 The WDM device may further include a second combining / splitting structure 201-2.

[0199] based on Figure 7 In a more general description, to describe the WDM device in a more general way,

[0200] The second combining / splitting structure 201-2 may include two bandpass filters and two total reflection structures;

[0201] The second combining / splitting structure includes two bandpass filters, namely a third bandpass filter and a fourth bandpass filter;

[0202] The second combining and splitting structure includes two total reflection structures, namely a third total reflection structure and a fourth total reflection structure;

[0203] The third bandpass filter is used to reflect light from the first incident port I. 1,3 The Gth wave of the incident third-path input signal C1 with two wavelengths 1,1 wavelength and transmission of the Gth 1,2 Wavelength; the Gth 1,2 The wavelength is located within the passband range of the third bandpass filter;

[0204] The third bandpass filter is also used to reflect the Eth bandpass filter from the second bandpass filter. 1,1 Wavelength, the Eth 1,2 Wavelength, the Fth 1,1 Wavelength and the Fth 1,2 wavelength;

[0205] The third total internal reflection structure is used to reflect the Gth wave from the third bandpass filter. 1,2Wavelength, the Eth 1,1 Wavelength, the Eth 1,2 Wavelength, the Fth 1,1 Wavelength and the Fth 1,2 wavelength;

[0206] The fourth total internal reflection structure is used to reflect the Gth wave from the third bandpass filter. 1,1 wavelength;

[0207] The fourth bandpass filter is used to transmit the Gth signal from the fourth total internal reflection structure. 1,1 wavelength and reflect the Gth from the third total internal reflection structure 1,2 Wavelength, the Eth 1,2 Wavelength, the Eth 1,1 Wavelength, Fth 1,1 Wavelength and F 1,2 wavelength;

[0208] The single-channel multi-wavelength signal Q1 output by the first common port also includes the Gth... 1,1 Wavelength and the Gth 1,2 wavelength.

[0209] It is understandable that the third path described above has two wavelengths in the input signal C1, specifically the Gth wavelength. 1,1 Wavelength and Gth 1,2 Wavelengths respectively correspond to Figure 8 The wavelengths λ3 and λ6 are shown. Figure 8 In the first combining / splitting structure 201-1, the first bandpass filter is the upper left bandpass filter, which transmits wavelength λ5 and reflects wavelengths λ1, λ2, and λ4. The second bandpass filter in the first combining / splitting structure 201-1 is the lower right bandpass filter, which transmits wavelength λ2 and reflects wavelengths λ1, λ4, and λ5. In the second combining / splitting structure 201-2, the third bandpass filter is the upper left bandpass filter, which transmits wavelength λ6 and reflects wavelengths λ1, λ2, λ4, λ5, and λ3. The fourth bandpass filter in the second combining / splitting structure 201-2 is the lower right bandpass filter, which transmits wavelength λ3 and reflects wavelengths λ1, λ2, λ4, λ5, and λ6, thereby obtaining signals with wavelengths λ1 to λ6. Thus, the first common port 204 can output the signals with wavelengths λ1 to λ6 obtained by the fourth bandpass filter. It is understood that... Figure 8 The example provided is a specific case. The passband range of a bandpass filter can also be set in other ways, such as according to the wavelength to be processed, which is not limited here.

[0210] The WDM device provided in the above embodiments can be used to combine three dual-wavelength signals, that is, to obtain a single signal with six wavelengths, thereby further reducing the processing cost of optical signals.

[0211] Furthermore, the embodiments of this application are based on the above. Figure 7 Based on the WDM device shown, a dual-density WDM device is also provided.

[0212] like Figure 9 As shown, this WDM device is based on... Figure 7 The WDM device shown includes a third combination / splitter structure 201-3, at least two second incident ports 203', and a second common port 204'.

[0213] The third combining / splitting structure 201-3 includes two bandpass filters, such as the fifth bandpass filter and the sixth bandpass filter, and also includes two low-pass or high-pass filters or two total reflection structures, such as the fifth total reflection structure and the sixth total reflection structure.

[0214] The second bandpass filter 2001 of the first combining and splitting structure 201-1 is also used to receive signals with wavelengths λ2 and λ5 from the second incident port 203'. The wavelengths λ1 and λ4 input to the first bandpass filter 2001 of the first combining and splitting structure 201 come from the sixth bandpass filter 2001 of the second combining and splitting structure 201.

[0215] The sixth bandpass filter 2001 of the third combiner / splitter structure 201-3 is also used to input signals with wavelengths λ1 and λ4 from the second incident port 203', and the fifth bandpass filter 2001 is also used to input signals with wavelengths λ1 and λ4 from the first incident port 203. The fifth and sixth bandpass filters 2001 are used to transmit one of wavelengths λ1 and λ4 respectively; for example, the fifth bandpass filter 2001 transmits wavelength λ1, and the sixth bandpass filter 2001 transmits wavelength λ4, or vice versa. The two total internal reflection structures in the second combiner / splitter structure 201 are used to reflect all the input signals. Thus, the fifth bandpass filter in the second combiner / splitter structure is also used to output signals with wavelengths λ1, λ2, λ4, and λ5 to the second common port 204'.

[0216] Similarly, this application also provides a more general description, as follows:

[0217] Based on such Figure 7 A more general description as described in, such as Figure 9 As shown, the at least one combined splitter structure in the WDM device may further include a third combined splitter structure;

[0218] The third combining and splitting structure includes two bandpass filters and two total reflection structures;

[0219] The third combining and splitting structure includes two bandpass filters, namely a fifth bandpass filter and a sixth bandpass filter;

[0220] The third combining and splitting structure includes two total reflection structures, namely a fifth total reflection structure and a sixth total reflection structure;

[0221] The fifth bandpass filter is used to transmit light from the first incident port I. 1,2 The incident Fth 1,2 wavelength, and reflect the Fth wave. 1,1 wavelength;

[0222] The fifth total internal reflection structure is used to reflect the Fth wave from the fifth bandpass filter. 1,2 wavelength;

[0223] The sixth total internal reflection structure is used to reflect the Fth wave from the fifth bandpass filter. 1,1 wavelength;

[0224] The sixth bandpass filter is used to transmit the Fth wave from the sixth total internal reflection structure. 1,1 wavelength and reflect the Fth total internal reflection structure 1,2 wavelength;

[0225] The first bandpass filter is used to receive the Fth bandpass from the sixth bandpass filter. 1,1 Wavelength and the Fth 1,2 Wavelength signals;

[0226] Second incident port I 2,1 The first input channel has two wavelengths, E. 2,1 Wavelength and E 2,2 The second input signal M2 with wavelength, and the second incident port I 2,2 The second input channel has two wavelengths, F. 2,1 Wavelength and F 2,2 The second input signal N2 has a wavelength of [wavelength].

[0227] The second bandpass filter is also used to transmit light from the second incident port I. 2,1 The incident Eth 2,1 wavelength and reflect the Eth 2,2 wavelength;

[0228] The second total internal reflection structure is also used to reflect the Eth wave from the second bandpass filter. 2,1 wavelength;

[0229] The first total internal reflection structure is also used to reflect the Eth wave from the second bandpass filter. 2,2 wavelength;

[0230] The first bandpass filter is also used to transmit the Eth element from the first total internal reflection structure. 2,2 The wavelength is reflected from the second bandpass filter. 2,1 wavelength;

[0231] The at least one combined branch structure further includes a third combined branch structure;

[0232] The third combining and splitting structure includes two bandpass filters and two total reflection structures;

[0233] The third combining and splitting structure includes two bandpass filters, namely a fifth bandpass filter and a sixth bandpass filter;

[0234] The third combining and splitting structure includes two total reflection structures, namely a fifth total reflection structure and a sixth total reflection structure;

[0235] The sixth bandpass filter is used to transmit light from the second incident port I. 2,2 The incident Fth 2,1 wavelength and reflect the Fth 2,2 Wavelength and the Eth wavelength from the first bandpass filter 2,2 Wavelength and the Eth 2,1 wavelength;

[0236] The sixth total internal reflection structure is used to reflect the Fth wave from the sixth bandpass filter. 2,2 wavelength;

[0237] The fifth total internal reflection structure is used to reflect the Fth wave from the sixth bandpass filter. 2,1 Wavelength, the Eth 2,2 Wavelength and the Eth 2,1 wavelength;

[0238] The fifth bandpass filter is used to transmit the Fth wave from the sixth total internal reflection structure. 2,2 wavelength, and reflect the Fth total reflection structure from the fifth total reflection structure. 2,1 Wavelength, the Eth 2,2 Wavelength and the Eth 2,1 wavelength;

[0239] The second common port is used to output a single-channel multi-wavelength signal Q2, the wavelength of which includes the Eth wavelength. 2,1 Wavelength, the Eth 2,2 Wavelength, Fth 2,1 Wavelength and F 2,2 wavelength.

[0240] Understandably, in the more general schemes described above, the Eth... 1,1Wavelength and E 1,2 Wavelengths respectively correspond to, for example Figure 9 The wavelengths λ2 and λ5 in the Fth wavelength range 1,1 Wavelength and F 1,2 Wavelengths respectively correspond to, for example Figure 9 Wavelengths λ1 and λ4. The first bandpass filter corresponds to... Figure 9 The bandpass filter in the upper left corner of the first combining / splitting structure 201-1, and the corresponding second bandpass filter are as follows: Figure 9 The bandpass filter in the lower right corner of the first combining / splitting structure 201-1. The fifth bandpass filter corresponds to... Figure 9 The bandpass filter in the upper left corner of the third combiner / splitter structure 201-3, and the corresponding sixth bandpass filter are as follows: Figure 9 The bandpass filter in the lower right corner of the third-stage merging and splitting structure 201-3.

[0241] The WDM device provided in the above embodiments can realize the merging of two dual-wavelength signals, that is, to obtain one signal with four wavelengths, and further realize the merging of two dual-density dual-wavelength signals, that is, to obtain two signals with four wavelengths, thereby further reducing the processing cost of optical signals.

[0242] Understandably, based on the aforementioned... Figures 7 to 9 The WDM device shown in any of the above can further include more combining / splitting structures and corresponding incident ports, thereby supporting the combining of more dual-wavelength signals, as well as the combining of more dual-density dual-wavelength signals. Specific solutions will not be elaborated here.

[0243] The WDM devices based on bandpass filters described above can also be implemented based on TFF.

[0244] like Figure 10 The diagram shown is a schematic of the structure of a TFF that implements bandpass filtering.

[0245] He Ru Figure 5 The illustrated scheme is similar, except that the band-stop filter within the TFF is replaced with a band-pass filter 2001. Thus, taking port a as the input wavelength as λ1 to λ6, and the passband of the band-pass filter including wavelength λ1 but excluding other wavelengths, based on the characteristics of the band-pass filter, port b of the TFF outputs wavelengths λ2 to λ6, and port d outputs wavelength λ1. If port c of the TFF inputs wavelengths λ1 to λ6, then port d outputs wavelengths λ2 to λ6, and port b outputs wavelength λ1.

[0246] Based on such Figure 10 The TFF mentioned above, in this application embodiment, can provide a WDM device based on TFF.

[0247] like Figure 11The diagram shown is a schematic structural diagram of a WDM device based on a bandpass TFF.

[0248] This WDM device can achieve the following: Figure 9 The function of the WDM device shown.

[0249] This WDM device can merge two dual-wavelength signals into one four-wavelength signal, or merge two dual-density dual-wavelength signals, thus obtaining two four-wavelength signals.

[0250] As can be seen, this WDM device includes four bandpass TFFs, where every two bandpass TFFs form a [missing information - likely a specific configuration]. Figure 7 Or such as Figure 9 The combined / splitter structure is shown below. For example, as... Figure 11 The bottom two of the four bandpass TFFs in the diagram can form, for example: Figure 7 Or such as Figure 9 The first combiner / splitter structure 201-1 shown can be configured with two bandpass TFFs to form a third combiner / splitter structure 201-3 as shown in Figure 9. The third combiner / splitter structure 201-3 is optional.

[0251] In the first combining / splitting structure 201-1, the upper bandpass TFF, i.e., the first bandpass TFF (corresponding to the first bandpass filter), transmits wavelength λ2 from the input wavelengths λ2 and λ5 at port a to port d, and reflects wavelengths λ1 and λ4 from the input wavelengths λ1 and λ4 at port c to port d, and reflects wavelength λ5 from the input wavelengths λ2 and λ5 at port a to port b. Port b is connected to port a of the lower bandpass TFF, i.e., the second bandpass TFF (corresponding to the second bandpass filter). Port d is connected to port c of the second bandpass TFF. The second bandpass TFF transmits wavelength λ5 to port d and reflects wavelengths λ1, λ2, and λ4 from port c to port d, thereby obtaining a signal with wavelengths λ1, λ2, λ4, and λ5 output from port d. The first common port 204 outputs a signal with wavelengths λ1, λ2, λ4, and λ5 from port d of the second bandpass TFF.

[0252] Optionally, in the third combining / splitting structure 201-3, the upper bandpass TFF, i.e., the fifth bandpass TFF (corresponding to the fifth bandpass filter), transmits wavelength λ1 from the input wavelength λ1 and λ4 at port c to port b, and reflects wavelength λ4 from the input wavelength λ1 and λ4 at port c to port d. Port b is connected to port a of the lower bandpass TFF, i.e., the sixth bandpass TFF (corresponding to the sixth bandpass filter), and port d is connected to port c of the sixth bandpass TFF. The sixth bandpass TFF transmits wavelength λ4 to port b and reflects wavelength λ1 from port a to port b, thereby obtaining a signal with wavelengths λ1 and λ4 output from port b. Port b of the sixth bandpass TFF is connected to port c of the first bandpass TFF, inputting the signal with wavelengths λ1 and λ4 into the first bandpass TFF.

[0253] Optionally, port b of the second bandpass TFF can also input signals with wavelengths λ2 and λ5, and port d of the sixth bandpass TFF can also input signals with wavelengths λ1 and λ4. Thus, port a of the fifth bandpass TFF can also output signals with wavelengths λ1, λ2, λ4 and λ5, thereby obtaining a second signal with four wavelengths.

[0254] Understandably, due to the structural symmetry of TFFs, the connections of the above bandpass TFFs can be varied, for example, as... Figure 11 The TFF connection shown can be varied as follows: Figure 12 The connection shown indicates that port b of the sixth bandpass TFF can be connected to port a of the first bandpass TFF, while port c of the first bandpass TFF is used to input signals with wavelengths λ2 and λ5, and port b of the second bandpass TFF is used to output signals with wavelengths λ1, λ2, λ4, and λ5. Optionally, in the case of a dual-density WDM, port d of the second bandpass TFF can also be used to input signals with wavelengths λ2 and λ5.

[0255] Optional, and as above Figure 11 Similar in structure, a WDM device that combines three dual-wavelength signals into one six-wavelength signal can also be provided. Furthermore, a dual-density WDM device that combines three dual-wavelength signals into one six-wavelength signal can also be provided, that is, a WDM device that obtains two six-wavelength signals.

[0256] Optionally, a structural diagram is shown below. Figure 13 As shown, for a detailed description, please refer to the following: Figure 11 As shown, a combined / splitter structure has been added, which includes... Figure 13 The bottom two bandpass TFFs are used to input signals with wavelengths λ3 and λ6, and combine these wavelengths λ3 and λ6 with the wavelengths λ1, λ2, λ4 and λ5 input to the combiner / splitter structure to obtain signals with wavelengths λ1 to λ6.

[0257] This application also provides a WDM device based on a band-stop filter, the structure of which is as follows: Figure 7 As shown. That is, as Figure 7 The structure shown can also be used to combine two signals with dual wavelengths using band-stop filters. In the first combining / splitting structure, the filter in the upper left corner is the first band-stop filter, and the filter in the lower right corner is the second band-stop filter. The first and second band-stop filters reflect one and the other wavelengths λ2 and λ5, respectively; for example, the first band-stop filter reflects wavelength λ2, and the second band-stop filter reflects wavelength λ5. Both the first and second band-stop filters transmit wavelengths λ1 and λ4. Thus, the second band-stop filter can also output signals with wavelengths λ1, λ2, λ4, and λ5.

[0258] Correspondingly, such as Figure 8 He Ru Figure 9 The structures shown are also applicable to band-stop filters. Simply change the wavelengths in the passband to wavelengths in the stopband, and vice versa.

[0259] Correspondingly, WDM devices based on band-stop filters can also be based on band-stop TFFs, i.e. Figure 5 The TFF shown is used to implement this.

[0260] like Figure 14 The diagram shown is a schematic representation of a dual-density WDM device based on a band-stop TFF. The second incident port 203' and the second common port 204 are both optional.

[0261] It is understandable that the structure based on the band-stop TFF, such as the dual-density WDM device based on the band-stop TFF shown in 14, can be changed to other structures to achieve the functions of the aforementioned WDM device based on the band-stop filter, and is not limited here.

[0262] It is understood that the Z-Block structure or TFF structure mentioned above are merely examples, and the WDM device provided in the embodiments of this application can also be implemented in other ways, such as arrayed waveguide grating (AWG), interleaver (ITL), reconfigurable optical add / drop multiplexer (ROADM), etc., which are not limited here.

[0263] Optionally, the total internal reflection structure in this embodiment can be implemented using optical fiber.

[0264] Based on the above structure, embodiments of this application also provide a method for fabricating a WDM device.

[0265] The fabrication method includes obtaining the corresponding WDM device based on a filter, Z-block, or TFF as described in the previous embodiments.

[0266] The specific descriptions of each component in the Z-block, the specific TFFs in the TFF, such as their functions, connections, or one or more settings, or the descriptions of each filter, can all refer to the descriptions in any of the foregoing embodiments, and will not be repeated here.

[0267] Furthermore, based on the WDM devices provided in the above embodiments, this application embodiment may also provide a transmitter and / or a receiver.

[0268] The transmitting end uses a WDM device provided in the aforementioned embodiments to combine optical waves, and the receiving end uses a WDM device provided in the aforementioned embodiments to separate optical waves.

[0269] The aforementioned sending end can be an access network device, a core network device, a separate device in the access network device, such as a BBU or RRU, a CU node or a DU node, or a separate device in the core network device, etc., which are not limited here.

[0270] The aforementioned receiving end can be an access network device, a core network device, a separate device in the access network device, such as a BBU or RRU, a CU node or a DU node, or a separate device in the core network device, etc., which are not limited here.

[0271] This application also provides a communication system, including the transmitting end and / or receiving end in the foregoing embodiments.

[0272] The various embodiments in this application can be used independently or in combination, and no limitation is made here.

[0273] Furthermore, various aspects or features of this application can be implemented as methods, apparatus, or articles of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" as used herein encompasses a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROMs), cards, sticks, or key drives, etc.). Additionally, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0274] It should be understood that in the embodiments shown above, the terms "first" and "second" are merely for the purpose of distinguishing different objects and should not constitute any limitation on this application.

[0275] It should also be understood that "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one" refers to one or more; "at least one of A and B," similar to "A and / or B," describes the relationship between related objects, indicating that three relationships can exist. For example, at least one of A and B can represent: A alone, A and B simultaneously, or B alone.

[0276] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0277] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0278] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0279] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0280] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0281] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0282] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wavelength division multiplexing (WDM) device, characterized in that, The device includes at least two four-port thin-film filter TFFs, the at least two four-port TFFs including a first TFF and a second TFF (201-1); the four ports include port a, port b, port c and port d; each TFF includes a sleeve and two fiber collimators; The first bandpass filter is fixed inside the first TFF and located between the two fiber collimators of the first TFF; the second bandpass filter is fixed inside the second TFF and located between the two fiber collimators of the second TFF; A signal 1 with a first wavelength (λ2) and a second wavelength (λ5) is input to port a of the first TFF. The first wavelength is located in the passband range of the first TFF, and the second wavelength is located in the stopband range of the first TFF. The signal 1-1 with the first wavelength is output from port d of the first TFF, and the signal 1-2 with the second wavelength is output from port b of the first TFF. The first TFF inputs a signal 2 with a third wavelength (λ1) and a fourth wavelength (λ4) at port c, both of which are located within the stopband of the first TFF. The signal 2 with the third wavelength and the fourth wavelength is output from port d of the first TFF. Port b of the first TFF is connected to port a of the second TFF, and port d of the first TFF is connected to port c of the second TFF; The second wavelength is located in the passband range of the second TFF, and the first wavelength, the third wavelength and the fourth wavelength are all located in the stopband range of the second TFF. The signal 1-1 with the first wavelength, the signal 1-2 with the second wavelength and the signal 2 with the third wavelength and the fourth wavelength are all output from port d of the second TFF and combined into a signal with 4 wavelengths.

2. The WDM device according to claim 1, characterized in that, The at least two four-port TFFs also include a third TFF and a fourth TFF (201-3). The third bandpass filter is fixed inside the third TFF and located between the two fiber collimators of the third TFF; The fourth bandpass filter is fixed inside the fourth TFF and located between the two fiber collimators of the fourth TFF; Port c of the first TFF is connected to port d of the fourth TFF; Port b of the third TFF is connected to port a of the fourth TFF, and port d of the third TFF is connected to port c of the fourth TFF. The signal 2, having the third wavelength (λ1) and the fourth wavelength (λ4), is input via port a of the third TFF; The third wavelength is located within the stopband of the third TFF and within the passband of the fourth TFF; The fourth wavelength is located within the passband and stopband of the third TFF; The third wavelength signal 2 1. Output from port d of the third TFF; The fourth wavelength signal 2 2. Output from port b of the third TFF; The signal 2, having the third wavelength and the fourth wavelength, is output from port d of the fourth TFF.

3. The WDM device according to claim 2, characterized in that, A signal 3 having a first wavelength (λ2) and a second wavelength (λ5) is input via port b of the second TFF; Signal 4, having a third wavelength (λ1) and a fourth wavelength (λ4), is input via port d of the fourth TFF; The signal 3 having the second wavelength and the signal 4 having the third wavelength and the fourth wavelength are both output from port a of the third TFF and combined into a signal with 4 wavelengths.

4. The WDM device according to claim 1, characterized in that, The at least two four-port thin-film filters also include a third TFF and a fourth TFF (201-3). The third bandpass filter is fixed inside the third TFF and located between the two fiber collimators of the third TFF; The fourth bandpass filter is fixed inside the fourth TFF and located between the two fiber collimators of the fourth TFF; Port a of the first TFF is connected to port d of the fourth TFF; Port b of the third TFF is connected to port a of the fourth TFF, and port d of the third TFF is connected to port c of the fourth TFF. The signal 2, having the third wavelength (λ1) and the fourth wavelength (λ4), is input via port c of the third TFF; The third wavelength is located within the passband of the third TFF and within the stopband of the fourth TFF; The fourth wavelength is located within the stopband range of the third TFF and within the passband range of the fourth TFF; The signal 1 of the first wavelength 1. Output from port b of the third TFF; The signal 1 of the second wavelength 2. Output from port d of the third TFF; The signal 2, having the third wavelength and the fourth wavelength, is output from port b of the fourth TFF.

5. The WDM device according to claim 4, characterized in that, A signal 3 having a first wavelength (λ2) and a second wavelength (λ5) is input via port d of the second TFF; Signal 4, having a third wavelength (λ1) and a fourth wavelength (λ4), is input via port d of the fourth TFF; The signal 3 having the second wavelength and the signal 4 having the third wavelength and the fourth wavelength are both output from port a of the third TFF and combined into a signal with 4 wavelengths.

6. A wavelength division multiplexing (WDM) device, characterized in that, The device includes at least two four-port thin-film filter TFFs, the at least two four-port TFFs including a first TFF and a second TFF (201-1); the four ports include port a, port b, port c and port d; each TFF includes a sleeve and two fiber collimators; The first band-stop filter is fixed inside the first TFF and located between the two fiber collimators of the first TFF; the second band-stop filter is fixed inside the second TFF and located between the two fiber collimators of the second TFF; A signal 1 with a first wavelength (λ2) and a second wavelength (λ5) is input into port a of the first TFF. The first wavelength is located in the stopband range of the first TFF, and the second wavelength is located in the passband range of the first TFF. The signal 1-1 with the first wavelength is output from port b of the first TFF, and the signal 1-2 with the second wavelength is output from port d of the first TFF. The first TFF inputs a signal 2 with a third wavelength (λ1) and a fourth wavelength (λ4) at port c, both of which are located within the stopband of the first TFF. The signal 2 with the third wavelength and the fourth wavelength is output from port b of the first TFF. Port b of the first TFF is connected to port a of the second TFF, and port d of the first TFF is connected to port c of the second TFF; The second wavelength is located in the stopband range of the second TFF, and the first wavelength, the third wavelength and the fourth wavelength are all located in the passband range of the second TFF. The signal 1-1 with the first wavelength, the signal 1-2 with the second wavelength and the signal 2 with the third wavelength and the fourth wavelength are all output from port d of the second TFF and combined into a signal with 4 wavelengths.

7. The WDM device according to claim 6, characterized in that, The at least two four-port thin-film filters also include a third TFF and a fourth TFF (201-3). The third band-stop filter is fixed inside the third TFF and located between the two fiber collimators of the third TFF; The fourth band-stop filter is fixed inside the fourth TFF and located between the two fiber collimators of the fourth TFF; Port c of the first TFF is connected to port d of the fourth TFF; Port b of the third TFF is connected to port a of the fourth TFF, and port d of the third TFF is connected to port c of the fourth TFF. The signal 2, having the third wavelength (λ1) and the fourth wavelength (λ4), is input via port a of the third TFF; The third wavelength is located within the stopband of the third TFF and within the passband of the fourth TFF; The fourth wavelength is located within the passband and stopband of the third TFF; The third wavelength signal 2 1. Output from port d of the third TFF; The fourth wavelength signal 2 2. Output from port b of the third TFF; The signal 2, having the third wavelength and the fourth wavelength, is output from port d of the fourth TFF.

8. The WDM device according to claim 7, characterized in that, A signal 3 having a first wavelength (λ2) and a second wavelength (λ5) is input via port b of the second TFF; Signal 4, having a third wavelength (λ1) and a fourth wavelength (λ4), is input via port b of the fourth TFF; The signal 3 having the second wavelength and the signal 4 having the third wavelength and the fourth wavelength are both output from port c of the third TFF and combined into a signal with 4 wavelengths.

9. A communication device, characterized in that, Includes the WDM device as described in any one of claims 1-8.

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