A device and method for compensating for spectrum imbalance of transmitting end signal in optical module

Abstract

The present invention relates to the field of optical communication technology, and provides a device and method for compensating for the spectrum imbalance of a transmitting end signal in an optical module. A spectrum scanning device in the device scans the spectrum of an optical signal output by a photoelectric modulation unit, and provides scanning data to a compensation parameter calculation module; the compensation parameter calculation module obtains the transfer function of the transmission and modulation of the transmitting end electrical signal according to the scanning data, and calculates the compensation parameters of the signal spectrum imbalance; the compensation parameter writing module writes the compensation parameters into a filtering unit; the signal filtering unit filters the transmitting end electrical signal according to the written compensation parameters, and realizes pre-compensation for the spectrum imbalance of the transmitting end signal. The present invention realizes the equalization of signals of different frequencies, and achieves the purpose of compensating for spectrum imbalance.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to a device and method for compensating for spectrum imbalance of a transmitting end signal in an optical module. Background Art

[0002] As the signal rate of the optical module increases, the spectrum width of the high-speed electrical signal inside the optical module also increases. Due to the low-pass characteristics of the transmission channel, the loss of the high-frequency component of the signal during the transmission process is higher than that of the low-frequency component, resulting in the imbalance of different frequencies of the signal. In high-speed optical modules, the attenuation of the high-frequency component of the signal is particularly serious. The high-frequency fading of the signal spectrum at the transmitting end greatly reduces the signal bandwidth, thereby introducing inter-symbol crosstalk, greatly affecting the signal quality, and causing the transmission performance of the optical module to deteriorate. In addition, at the transmitting end of the optical module, the spectrum characteristics of the electrical chip and optical devices, the PCB high-speed routing design, etc. will affect the attenuation of the high-frequency signal. Therefore, compensating for the spectrum imbalance of the optical module transmitting end signal is crucial to ensure the performance of the optical module transmitting end.

[0003] In view of this, overcoming the defects of the prior art is an urgent problem to be solved in the field of this technology. Summary of the invention

[0004] The technical problem to be solved by the present invention is to solve the problem of signal spectrum imbalance caused by the spectrum characteristics of the transmitting end signal in the optical module.

[0005] The present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a device for compensating for spectrum imbalance of a transmitting end signal in an optical module, comprising an optical modulation unit, a spectrum scanning device, a compensation parameter calculation module, a compensation parameter writing module, and a signal filtering unit, specifically:

[0007] The spectrum scanning device scans the spectrum of the optical signal output by the photoelectric modulation unit, and provides the scanning data to the compensation parameter calculation module;

[0008] The compensation parameter calculation module obtains the transfer function of the transmission and modulation of the transmitting end electrical signal according to the scanning data, and calculates the compensation parameter of the signal spectrum imbalance;

[0009] The compensation parameter writing module writes the compensation parameter into the filtering unit;

[0010] The signal filtering unit filters the transmitting end electrical signal according to the written compensation parameters to achieve pre-compensation for the imbalance of the transmitting end signal spectrum.

[0011] Preferably, the transfer function of the transmission and modulation of the transmitting end electrical signal is obtained as follows:

[0012] Based on the collected scanning data, the optical signal spectrum is moved to the baseband, and the electro-optical transfer function of the signal is for:

[0013] ;

[0014] in, is the optical signal spectrum, is the center frequency of the spectrum, is the ideal electrical signal spectrum.

[0015] Preferably, in the ideal electrical signal spectrum When it is a gate function, the normalized optical signal spectrum is used as the normalized photoelectric transfer function, and the collected spectral data is normalized to obtain the normalized transfer function H(x).

[0016] Preferably, a compensation parameter of the signal spectrum imbalance is calculated, wherein the spectrum function C(x) of the compensation parameter is:

[0017] ;

[0018] Where BW is the optical spectrum bandwidth, and the corresponding electrical signal spectrum is ;

[0019] The compensation parameter spectrum function is discretized to obtain the compensation parameter that can be written into the filter unit.

[0020] Preferably, the processing process among the spectrum scanning device, the compensation parameter calculation module, the compensation parameter writing module and the signal filtering unit is repeated multiple times until the spectrum imbalance compensation parameters of each high-speed signal in the optical module are obtained and solidified into the optical module.

[0021] In a second aspect, the present invention provides a method for compensating for spectrum imbalance of a transmitting end signal in an optical module, comprising:

[0022] Setting up a high-speed radio frequency signal link from the input RF signal to the optical module, modulating it on the optical signal through the optical module transmitting end;

[0023] Scan the spectrum of the optical signal output by the optical module transmitting end, and collect the scanning data of the optical signal spectrum;

[0024] According to the scanning data of the optical signal spectrum, it is moved to the baseband and normalized to obtain the transfer function H(x) of the electrical signal transmission and modulation at the transmitting end. The function value reflects the attenuation of different frequencies of the electrical signal, and the corresponding compensation parameter C(x) is calculated. The compensation parameter C(x) enables the attenuation of the high-frequency signal in the module to be pre-added to the low-frequency signal, thereby achieving the balance of the full-band signal.

[0025] The RF signal input to the module is filtered according to the compensation parameters, and the signal spectrum is preprocessed, thereby compensating for the high-frequency damage of the signal.

[0026] Preferably, obtaining the transfer function of the transmission and modulation of the transmitting end electrical signal specifically includes:

[0027] According to the collected scanning data, the normalized electro-optic transfer function H(x) is obtained after normalization processing.

[0028] Preferably, the electro-optical transfer function H(x) is specifically:

[0029] Based on the collected scanning data, the optical signal spectrum is moved to the baseband, and the electro-optical transfer function of the signal is for:

[0030] ;

[0031] in, is the optical signal spectrum, is the center frequency of the spectrum, is an ideal electrical signal spectrum; for the electro-optical transfer function The electro-optic transfer function H(x) is obtained by normalization.

[0032] Preferably, the spectrum function C(x) of the compensation parameter is:

[0033] ;

[0034] Where f0 is the center frequency of the spectrum, BW is the optical spectrum bandwidth, and x is the frequency of the current signal;

[0035] The compensation parameter spectrum function is discretized to obtain the compensation parameter that can be written into the filter unit.

[0036] Preferably, the above operation is repeated until the high-frequency damage of each high-speed radio frequency signal is compensated, and the compensation parameters are solidified into the optical module.

[0037] In a third aspect, the present invention further provides a device for compensating for an imbalanced spectrum of a transmitting end signal in an optical module, which is used to implement the method for compensating for an imbalanced spectrum of a transmitting end signal in an optical module in the second aspect, and the device comprises:

[0038] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor to execute the method for compensating for spectrum imbalance of a transmitting end signal in an optical module according to the second aspect.

[0039] In a fourth aspect, the present invention further provides a non-volatile computer storage medium storing computer executable instructions, which are executed by one or more processors to complete the method for compensating for spectrum imbalance of a transmitting end signal in an optical module according to the second aspect.

[0040] The present invention detects the spectrum data of the optical signal at the transmitting end of the optical module through a spectrum scanning device, thereby obtaining the attenuation caused by the transmission and modulation of the transmitting end signal in the optical module, and obtains the compensation parameters based on the data calculation, which are written into the signal filtering unit by the compensation parameter writing device, thereby realizing the balance of signals of different frequencies and achieving the purpose of compensating for spectrum imbalance. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a schematic diagram of the structure of a device for compensating for spectrum imbalance of a transmitting end signal in an optical module provided by an embodiment of the present invention;

[0043] Figure 2 It is a schematic diagram of a normalized transfer function of an optical module transmitting end provided by an embodiment of the present invention;

[0044] Figure 3 It is a flowchart of a method for compensating for spectrum imbalance of a transmitting end signal in an optical module provided by an embodiment of the present invention;

[0045] Figure 4 The present invention provides a flow chart for controlling and realizing the imbalance compensation of the spectrum of the transmitting end signal. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0048] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Embodiment 1:

[0050] Embodiment 1 of the present invention provides a device for compensating for spectrum imbalance of a transmitting end signal in an optical module, comprising an optical modulation unit, a spectrum scanning device, a compensation parameter calculation module, a compensation parameter writing module, and a signal filtering unit, specifically:

[0051] The spectrum scanning device scans the spectrum of the optical signal output by the photoelectric modulation unit, and provides the scanning data to the compensation parameter calculation module;

[0052] The compensation parameter calculation module obtains the transfer function of the transmission and modulation of the transmitting end electrical signal according to the scanning data, and calculates the compensation parameter of the signal spectrum imbalance;

[0053] The compensation parameter writing module writes the compensation parameter into the filtering unit;

[0054] The signal filtering unit filters the transmitting end electrical signal according to the written compensation parameters to achieve pre-compensation for the imbalance of the transmitting end signal spectrum.

[0055] The embodiment of the present invention detects the spectrum data of the optical signal at the transmitting end of the optical module through a spectrum scanning device, thereby obtaining the attenuation caused by the transmission and modulation of the transmitting signal in the optical module, and obtains the compensation parameters based on the data calculation, which are written into the signal filtering unit by the compensation parameter writing device, thereby realizing the balance of signals of different frequencies and achieving the purpose of compensating for spectrum imbalance.

[0056] In the embodiment of the present invention, a preferred implementation method is also provided for obtaining the transfer function of the transmission and modulation of the transmitting end electrical signal, specifically:

[0057] Based on the collected scanning data, the optical signal spectrum is moved to the baseband, and the electro-optical transfer function of the signal is for:

[0058] ;

[0059] in, is the optical signal spectrum, is the center frequency of the spectrum, is the ideal electrical signal spectrum.

[0060] Furthermore, in the ideal electrical signal spectrum When it is a gate function, the normalized optical signal spectrum is used as the normalized photoelectric transfer function, and the collected spectral data is normalized to obtain the normalized transfer function H(x).

[0061] In the embodiment of the present invention, the compensation parameter of the signal spectrum imbalance is calculated, wherein the spectrum function C(x) of the compensation parameter is:

[0062] ;

[0063] Where BW is the optical spectrum bandwidth, and the corresponding electrical signal spectrum is ;

[0064] The compensation parameter spectrum function is discretized to obtain the compensation parameter that can be written into the filter unit.

[0065] Typically, based on the device proposed in the embodiment of the present invention, the processing process among the spectrum scanning device, the compensation parameter calculation module, the compensation parameter writing module, and the signal filtering unit is repeated many times until the spectrum imbalance compensation parameters of each high-speed signal in the optical module are obtained and solidified into the optical module.

[0066] Embodiment 2:

[0067] The present invention provides a method for compensating for the imbalance of the spectrum of the transmitting end signal in an optical module. The corresponding method can be implemented based on the device proposed in Example 1, and can also be completed by other feasible device structures. Its implementation basis should not be directly limited to the device proposed in Example 1. Figure 3 As shown, the method includes:

[0068] In step 201, a high-speed radio frequency signal link is set up from an input RF signal to an optical module, and the input RF signal is modulated on an optical signal by the optical module transmitter.

[0069] In step 202, the spectrum of the optical signal output by the optical module transmitting end is scanned to collect scanning data of the spectrum of the optical signal.

[0070] In step 203, the scanned data of the optical signal spectrum is moved to the baseband and normalized to obtain the transfer function H(x) of the transmission and modulation of the transmitting end electrical signal. The function value reflects the attenuation of different frequencies of the electrical signal, and the corresponding compensation parameter C(x) is calculated.

[0071] The compensation parameter C(x) enables the attenuation of high-frequency signals in the module to be added to low-frequency signals in advance, thereby achieving equalization of full-band signals.

[0072] Preferably, the spectrum function C(x) of the compensation parameter is:

[0073] ;

[0074] Where f0 is the center frequency of the spectrum, BW is the optical spectrum bandwidth, and x is the frequency of the current signal;

[0075] The compensation parameter spectrum function is discretized to obtain the compensation parameter that can be written into the filter unit.

[0076] In step 204, the RF signal input to the module is filtered according to the compensation parameters, and the signal spectrum is preprocessed, thereby compensating for high-frequency damage to the signal.

[0077] The embodiment of the present invention detects the spectrum data of the optical signal at the transmitting end of the optical module through a spectrum scanning device, thereby obtaining the attenuation caused by the transmission and modulation of the transmitting signal in the optical module, and obtains the compensation parameters based on the data calculation, which are written into the signal filtering unit by the compensation parameter writing device, thereby realizing the balance of signals of different frequencies and achieving the purpose of compensating for spectrum imbalance.

[0078] The electro-optical transfer function H(x) is obtained as follows:

[0079] Based on the collected scanning data, the optical signal spectrum is moved to the baseband, and the electro-optical transfer function of the signal is for:

[0080] ;

[0081] in, is the optical signal spectrum, is the center frequency of the spectrum, is an ideal electrical signal spectrum; for the electro-optical transfer function The electro-optic transfer function H(x) is obtained by normalization.

[0082] The above-mentioned steps 201 to 204 are repeated repeatedly until the high-frequency damage of each high-speed radio frequency signal is compensated, and the compensation parameters are solidified into the optical module.

[0083] Embodiment 3:

[0084] Compared with Example 2, this embodiment of the present invention describes the method process of the present invention from another description perspective. Many extended descriptions in Example 2 are applicable to this embodiment of the present invention, such as Figure 4The figure shows a flowchart of the scheme for compensating the high-frequency damage of the transmitting end signal. The main steps are as follows:

[0085] In step 301, a high-speed radio frequency signal link is set from an input RF signal to an optical module.

[0086] In step 302, it is modulated on an optical signal through an optical module.

[0087] In step 303, the scanning accuracy and range of the spectrum scanning device are set, the spectrum of the optical signal output by the optical module transmitting end is scanned, and the spectrum data of the optical signal is collected.

[0088] In step 304, the compensation parameter calculation module processes the received optical signal spectrum data to obtain the electro-optical transfer function of the high-frequency signal transmission and modulation at the transmitting end, and normalizes the transfer function, such as Figure 2 The figure shows a schematic diagram of the normalized transfer function. According to the filter design requirements, the corresponding compensation parameters are calculated.

[0089] In step 305, the compensation parameter writing module receives the compensation parameters from the compensation parameter calculation module and writes them into the filter unit in the module.

[0090] In step 306, the filter unit performs filtering processing on the high-speed electrical signal input to the module according to the compensation parameters to compensate for high-frequency damage of the signal.

[0091] In step 307, the above operations are repeated until the high-frequency damage of each high-speed radio frequency signal is compensated, and the compensation parameters are fixed in the optical module.

[0092] The embodiment of the present invention detects the spectrum data of the optical signal at the transmitting end of the optical module through a spectrum scanning device, thereby obtaining the attenuation caused by the transmission and modulation of the transmitting signal in the optical module, and obtains the compensation parameters based on the data calculation, which are written into the signal filtering unit by the compensation parameter writing device, thereby realizing the balance of signals of different frequencies and achieving the purpose of compensating for spectrum imbalance.

[0093] It is worth noting that the information interaction, execution process, etc. between the modules and units within the above-mentioned devices and systems are based on the same concept as the processing method embodiment of the present invention. The specific contents can be found in the description of the method embodiment of the present invention and will not be repeated here.

[0094] A person skilled in the art may understand that all or part of the steps in the various methods of the embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the storage medium may include: a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for compensating for spectrum imbalance of a transmitting end signal in an optical module, characterized in that: include: Step 1 sets up a high-speed radio frequency signal link from an input RF signal to an optical module, and modulates it on an optical signal through the optical module transmitter; Step 2: Scanning the spectrum of the optical signal output by the optical module transmitting end to collect scanning data of the optical signal spectrum; Step 3: Move the scanned data of the optical signal spectrum to the baseband and perform normalization processing to obtain the transfer function H(x) of the transmission and modulation of the transmitting end electrical signal. The function value reflects the attenuation of different frequencies of the electrical signal, and the corresponding compensation parameter C(x) is calculated. The compensation parameter C(x) enables the attenuation of the high-frequency signal in the module to be pre-added to the low-frequency signal, thereby achieving the balance of the full-band signal. Step 4: filter the RF signal input to the module according to the compensation parameters and pre-process the signal spectrum, thereby compensating for high-frequency damage to the signal; Repeat steps 1 to 4 above until the high-frequency damage of each high-speed RF signal is compensated and the compensation parameters are fixed in the optical module. The transfer function H(x) of the transmitting end electrical signal transmission and modulation is specifically: Based on the collected scanning data, the optical signal spectrum is moved to the baseband, and the electro-optical transfer function of the signal is for: ； in, is the optical signal spectrum, is the center frequency of the spectrum, is an ideal electrical signal spectrum; for the electro-optical transfer function Normalizing to obtain the transfer function H(x) of the transmission and modulation of the transmitting end electrical signal; The spectrum function C(x) of the compensation parameter is: ； Where BW is the optical spectrum bandwidth, and x is the frequency of the current signal; The compensation parameter spectrum function is discretized to obtain the compensation parameter that can be written into the filter unit.

2. A device for compensating for spectrum imbalance of a transmitting end signal in an optical module, characterized in that: It includes a light modulation unit, a spectrum scanning device, a compensation parameter calculation module, a compensation parameter writing module, and a signal filtering unit. Specifically: The spectrum scanning device scans the spectrum of the optical signal output by the photoelectric modulation unit, and provides the scanning data to the compensation parameter calculation module; The compensation parameter calculation module obtains the transfer function of the transmission and modulation of the transmitting end electrical signal according to the scanning data, and calculates the compensation parameter of the signal spectrum imbalance; The compensation parameter writing module writes the compensation parameter into the filtering unit; The signal filtering unit filters the transmitting end electrical signal according to the written compensation parameters to achieve pre-compensation for the imbalance of the transmitting end signal spectrum; Repeating the processing process among the spectrum scanning device, the compensation parameter calculation module, the compensation parameter writing module, and the signal filtering unit repeatedly until the spectrum imbalance compensation parameter of each high-speed signal in the optical module is obtained and solidified into the optical module; The transfer function of the transmission and modulation of the transmitting end electrical signal is specifically: Based on the collected scanning data, the optical signal spectrum is moved to the baseband, and the electro-optical transfer function of the signal is for: ； in, is the optical signal spectrum, is the center frequency of the spectrum, is the ideal electrical signal spectrum; In the ideal electrical signal spectrum When it is a gate function, the normalized optical signal spectrum is used as the normalized photoelectric transfer function, and the collected spectral data is normalized to obtain the normalized transmission and modulation transfer function H(x) of the transmitting end electrical signal; Calculate the compensation parameter of the signal spectrum imbalance, where the spectrum function C(x) of the compensation parameter is: ； Where BW is the optical spectrum bandwidth, and the corresponding electrical signal spectrum is ; The compensation parameter spectrum function is discretized to obtain the compensation parameter that can be written into the filter unit.

Images