Three-transmitting and three-receiving COMBO PON optical device

Abstract

The invention relates to a three-transmitting and three-receiving COMBO PON optical device which comprises a device body, the device body is composed of a transmitting part assembly and a receiving part assembly, one side of an inner cavity of the transmitting part assembly is sequentially provided with 45 optical filters I, II and III, the other side of the inner cavity of the transmitting part assembly is correspondingly provided with lasers I, II and III, and the optical filters and the lasers are arranged at the same angle. The receiving part assembly comprises a first detector, a second detector, a third detector and an adapter, the first detector and the third detector are arranged along a center line, the second detector is located on one side of the center line, a first prism, a second prism and a band-pass optical filter are sequentially arranged at the position of the center line, and the first prism, the second prism and the band-pass optical filter are used for demultiplexing and receiving downlink signals; through a total reflection prism and band-pass optical filter combined structure, the optical signal separation precision and reflection efficiency are improved, and the adapter adopts a standard optical fiber interface to realize efficient coupling with an external network. The method has the effects of realizing high-precision division multiplexing of multi-wavelength uplink and downlink signals of the PON system, low insertion loss and high stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical communication devices, in particular to a three-transmission and three-reception COMBO PON optical device. BACKGROUND

[0002] With the development of passive optical network (PON) technology, in order to meet the demand for high-speed access, the industry gradually evolves from traditional GPON and XG-PON to Combo PON system supporting higher bandwidth and multi-service carrying capacity. Combo PON technology supports multiple PON standards in the same optical module, realizes multiplexing and demultiplexing of uplink and downlink signals, has the advantages of high bandwidth utilization, strong system compatibility, low deployment cost, etc. The mainstream three-transmission and three-reception 50G Combo PON OLT optical device on the market usually adopts a multi-wavelength combination structure with a transmission wavelength of 1342nm, 1490nm and 1577nm, and a receiving wavelength of 1310nm, 1296nm and 1270nm, to realize multi-standard coexistence and high-speed data transmission.

[0003] The existing three-transmission and three-reception Combo PON device generally adopts a BOX plus coaxial (BOX + COAX) structure to realize the airtight packaging of the optical device. The transmission optical path part is usually packaged in a small BOX cavity to integrate multiple lasers and optical filters; and the receiving optical path part generally adopts a TO packaging form to integrate multiple photodetectors to realize the reception and conversion of downlink signals of different wavelengths. In order to realize multi-wavelength separation, the existing technical solutions mostly adopt a pure optical filter structure, which separates optical signals of different wavelengths by setting multiple optical filters with different angles.

[0004] The existing structure has obvious deficiencies in the implementation process. Referring to Figure 12 、 Figure 13 , the pure optical filter demultiplexing scheme usually needs to use up to 9 optical filters, and some of the optical filters need to be set at an angle of 8° or 13° to meet the reflection and transmission path requirements of specific wavelengths, resulting in complex optical path design and high alignment accuracy requirements. Secondly, due to the use of multiple optical filters, the optical path length is relatively long, which causes the overall device size to be too large, making it difficult to meet the size requirements of compact packaging structures such as SFP-DD packaging. In addition, the multi-optical filter structure has high assembly process difficulty in the actual patching and optical path coupling process, which easily causes increased optical loss and poor assembly consistency, making it difficult to realize stable mass production.

[0005] In view of the above related art, the inventors believe that the existing three-transmission and three-reception Combo PON OLT optical device still has a large room for improvement in terms of structural compactness, optical design complexity, and manufacturing process feasibility. How to optimize the optical path design, reduce the number of optical elements, and shorten the overall length of the device while maintaining high demultiplexing accuracy and low insertion loss has become a technical problem that technicians in the field need to solve. SUMMARY

[0006] To improve the above technical problems, the present application provides a three-transmission and three-reception COMBO PON optical device.

[0007] The three-transmission and three-reception COMBO PON optical device provided by the present application adopts the following technical scheme: A three-transmission and three-reception COMBO PON optical device, comprising a device body, the device body 10 comprising a transmission component assembly and a receiving component assembly; A 45º optical filter one, a 45º optical filter two, and a 45º optical filter three are arranged from top to bottom on one side of the main cavity of the transmission component assembly, and the 45º optical filter one, the 45º optical filter two, and the 45º optical filter three are arranged in the same angle and state; a laser one, a laser two, and a laser three are arranged from top to bottom on the other side of the main cavity, and the laser one, the laser two, and the laser three are arranged in the same angle and state; The receiving component assembly comprises a detector one, a detector two, a detector three, and an adapter, the detector one is located at the upper end of the receiving component assembly, the detector three is located at the lower end of the receiving component assembly, and the center lines of the detector one and the detector three are consistent; The detector two is located on one side of the center lines of the detector one and the detector three; The center lines of the detector one and the detector three are respectively provided with a prism one and a prism two from bottom to top, the prism one is provided with an optical filter one at the lower end, and the prism one is provided with an optical filter three at the upper end, and the optical filter three is located at the middle position of the prism one and the prism two; The prism two is provided with an optical filter six at the upper end, an optical filter four is arranged on the side close to the detector two of the prism two, an optical filter five is arranged on the side away from the detector two of the prism two, and an optical filter two is arranged on the side away from the adapter of the prism two.

[0008] By adopting the above technical scheme, the symmetrical arrangement structure of three groups of lasers and three 45º filters in the transmitting component assembly enables efficient multiplexing output of each wavelength optical signal under the same incidence angle condition, thereby reducing optical path deviation, improving multi-wavelength coupling accuracy, and the angle setting of the 45º filter ensures the path consistency and direction stability of the reflected and transmitted light beams, achieving collinear output of multi-wavelength light beams in a limited cavity space, greatly improving the compactness and light energy utilization of the transmitting unit, the receiving component assembly arranges the detector one and the detector three along the center line, and sequentially sets the prism one and the prism two at both ends of the center line, thereby achieving downlink signal light splitting and guiding, the light splitting structure composed of each prism and multiple bandpass filters can separate the composite incident light to the corresponding detector channel with high precision according to the transmission and reflection characteristics of different wavelengths, the layered configuration of the filter one to the filter six effectively controls the propagation path and wavelength selectivity of the light beam, so that the optical signal is incident to the corresponding detector at the optimal angle after multiple reflections and transmissions, improving the signal separation accuracy and receiving sensitivity, the combination of the filter and the prism reduces the number of required filters, simplifies the optical path structure, shortens the overall optical path length, makes the overall size of the device smaller, and is easy to package into a compact structure module such as SFP-DD, reduces the filter mounting and coupling process difficulty, reduces the optical loss caused by assembly error, improves the consistency and yield of batch production, and through the optical path optimization configuration of the transmitting and receiving ends, efficient multiplexing, low insertion loss and high isolation of uplink and downlink multi-wavelength signals are realized, the overall structure is compact and stable, and can meet the application requirements of new generation PON system for high bandwidth, high integration and high reliability.

[0009] Optionally, the 45º filter one, the 45º filter two and the 45º filter three are respectively used for separating or combining different wavelength optical signals, preferably corresponding to 1310 nm, 1490 nm and 1550 nm three kinds of wavelength signals.

[0010] By adopting the above technical scheme, different wavelength optical signals can be efficiently separated or combined in the same device, wherein the 45º filter one, two and three are selectively reflected and transmitted for 1310 nm, 1490 nm and 1550 nm wavelengths, so that multi-wavelength signals can be accurately multiplexed and separated in the coaxial path, which significantly improves the integration and signal isolation of the optical path, reduces the insertion loss and crosstalk, and ensures the transmission stability and system communication performance of the uplink and downlink signals.

[0011] Optionally, the laser one, the laser two and the laser three are respectively arranged corresponding to the filter one, the filter two and the filter three, for transmitting optical signals of different wavelengths to realize multi-wavelength multiplexing transmission.

[0012] By adopting the technical scheme, the laser one, two and three work in cooperation with the corresponding optical filters, simultaneously emit optical signals of different wavelengths, realize multiplexed output of multiple wavelengths, transmit multiple channels of data in the same optical path, make the coupling efficiency of the optical signals higher, reduce the interference and power loss between wavelengths, improve the transmission capacity and spectral efficiency of the system, meet the demand of multiple wavelength high-speed communication in the PON system, and improve the integration and stability of the overall device.

[0013] Optionally, the prism one and the prism two are both made of full reflection glass material, and the reflection surfaces thereof are coated to improve the reflection efficiency of optical signals and reduce signal loss.

[0014] By adopting the technical scheme, the prism one and the prism two are made of full reflection glass material and are coated, the reflection efficiency and direction accuracy of optical signals are improved, the loss of optical energy in the reflection process is reduced, the transmission intensity and stability of optical signals in the receiving optical path are effectively improved, the consistency and high coupling efficiency of multiple wavelength signals in the wave division and guiding process are ensured, the optical transmission performance of low insertion loss and high signal-to-noise ratio is realized, and the optical stability and reliability of the overall device are enhanced.

[0015] Optionally, the optical filter one, the optical filter two, the optical filter three, the optical filter four, the optical filter five and the optical filter six are all bandpass optical filters, the center wavelengths of which correspond to the emission wavelengths and the receiving wavelengths one by one, and are used for selectively transmitting or reflecting optical signals of specific wave bands.

[0016] By adopting the technical scheme, the six bandpass optical filters can realize accurate selective transmission or reflection of optical signals of different wavelengths, ensure that the emission wavelengths and the receiving wavelengths correspond to each other, effectively reduce the crosstalk between wavelengths, improve the separation accuracy of optical signals, enable the uplink and downlink multiple wavelength optical signals to be independently transmitted and stably received in the same device, and thus improve the transmission efficiency, signal-to-noise ratio and overall reliability of the COMBO PON optical device.

[0017] Optionally, the adapter is a standard SC / APC or LC / APC optical fiber interface, which is used for reliable connection with an external optical fiber communication network to realize input and output coupling of optical signals.

[0018] By adopting the technical scheme, the adapter provides a standard SC / APC or LC / APC optical fiber interface to realize reliable connection and efficient coupling of the device and the external optical fiber communication network, ensure stable input and output of the uplink and downlink optical signals, reduce connection loss and reflection, improve the overall transmission efficiency and reliability of the system, facilitate quick installation, maintenance and compatibility with the existing optical network of the optical device, and meet the application demand of high density and compactness of the FTTx access network.

[0019] Optionally, the probe one, the probe two and the probe three correspond to different wavelengths of downlink received signals, preferably using InGaAs PIN photodiode structure to improve the receiving sensitivity.

[0020] By using the above technical scheme, the probe one, the probe two and the probe three correspond to different wavelengths of downlink received signals, realizing efficient separation and reception of multi-wavelength optical signals, using InGaAs PIN photodiode structure to significantly improve the photoelectric conversion efficiency and receiving sensitivity, reduce noise interference, ensure reliable reception of signals under low power conditions, and realize accurate wave separation of downlink signals through the cooperation of multiple probes, improve the signal quality and communication stability of the PON system, and be suitable for high-speed and high-density optical access network.

[0021] Optionally, the transmitting component assembly and the receiving component assembly of the main body cavity are partitioned by an isolation cavity structure to reduce optical crosstalk between the transmitting end and the receiving end.

[0022] By using the above technical scheme, the isolation cavity structure is arranged between the transmitting component assembly and the receiving component assembly, effectively isolating the interference between the transmitting light path and the receiving light path, reducing optical crosstalk, ensuring independent transmission and high fidelity of uplink and downlink signals, reducing the influence of reflected light on the receiving probe through the isolation structure, improving the signal receiving accuracy and system stability, optimizing the overall performance of the PON optical device, and improving the reliability and transmission quality of the optical communication system.

[0023] Optionally, the transmitting component assembly and the receiving component assembly are fixed through coaxial alignment structure, so that the optical axis coincidence degree is controlled within ±0.1°, to ensure high coupling efficiency and low insertion loss.

[0024] By using the above technical scheme, the coupling efficiency of optical signals is significantly improved, the optical loss is reduced, efficient optical energy transmission is realized, accurate alignment ensures the stability and reliability of multi-wavelength optical signals in the multiplexing and demultiplexing process, reduces the insertion loss and signal attenuation, improves the transmission performance and system stability of the entire COMBO PON optical device, and meets the requirements of high-speed optical communication.

[0025] Optionally, the device body shell is made of metal shielding material, and a heat conduction channel is arranged inside to reduce the working temperature rise of the laser and improve the overall stability and life of the device.

[0026] By using the above technical scheme, the heat generated by the laser is effectively dissipated, the working temperature rise is reduced, the laser and optical elements are kept running at a stable temperature, the overall thermal stability and performance reliability of the device are improved, and the service life of the optical device is prolonged. The metal shielding can also suppress electromagnetic interference, ensuring the stability and communication quality of optical signal transmission.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: The emission component assembly adopts a symmetrical arrangement structure of three groups of lasers and three 45º filters, enabling different wavelength optical signals to be efficiently multiplexed and output under the same incident angle condition, reducing optical path deviation, improving multi-wavelength coupling accuracy, realizing collinear output of multi-wavelength beams in a limited cavity space, and improving the compactness and optical energy utilization of the emission unit; The receiving component assembly arranges detector one and detector three along the center line, and sets prism one and prism two and multi-layer bandpass filters, to realize high-precision wave division and guidance of downlink signals, and the layered configuration of the filters effectively controls the optical beam propagation path and wavelength selectivity, improving signal separation accuracy and receiving sensitivity; Through the optical path combination of prisms and bandpass filters, the number of filters required is reduced, the optical path structure is simplified, the optical path length is shortened, the overall size of the device is smaller, it is convenient to package into a compact structure module such as SFP-DD, the mounting and coupling process difficulty is reduced, and the batch production consistency and yield are improved; The uplink and downlink multi-wavelength signals realize efficient demultiplexing, low insertion loss and high isolation, ensuring the stability of optical signals in the emission and reception process, and improving the system transmission efficiency and communication quality; The 45º filters realize selective reflection and transmission for 1310 nm, 1490 nm and 1550 nm wavelengths, enabling accurate multiplexing and wave division of multi-wavelength signals in the same coaxial path, improving optical path integration and signal isolation, and reducing crosstalk and insertion loss; The lasers and filters are correspondingly arranged to realize multi-wavelength multiplexing output, improve coupling efficiency, reduce wavelength interference and power loss, and improve system transmission capacity and spectral utilization; The full reflection prism material and coating treatment improve the reflection efficiency and direction accuracy of optical signals, reduce energy loss, enhance the transmission intensity and stability of the receiving optical path, realize low insertion loss and high signal-to-noise ratio; The bandpass filters one to six ensure that the emission and reception wavelengths correspond, reduce wavelength crosstalk, improve optical signal separation accuracy, enable independent transmission and stable reception of multi-wavelength optical signals, improve transmission efficiency and system reliability; The adapter adopts standard SC / APC or LC / APC interfaces to realize reliable connection and efficient coupling with external fiber optic networks, reduce connection loss and reflection, facilitate installation and maintenance, and be compatible with FTTx access networks; The emission and reception end isolation cavity structure reduces optical crosstalk, ensures independent transmission and high fidelity of uplink and downlink signals, and improves reception accuracy and system stability; The coaxial alignment structure ensures that the optical axis coincidence degree is within ±0.1°, improves coupling efficiency, reduces insertion loss, and ensures the stability and reliability of multi-wavelength signal multiplexing and wave division; The metal shielding shell and the heat conducting channel effectively reduce the temperature rise of the laser, improve the thermal stability and reliability of the device, prolong the service life, and inhibit electromagnetic interference to ensure the quality of optical signal transmission. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application.

[0029] Figure 2 is a schematic diagram of a transmitting component assembly in Figure 1 .

[0030] Figure 3 is a schematic diagram of a receiving component assembly in Figure 1 .

[0031] Figure 4 is a schematic diagram of a 1342nm laser transmitting optical path diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application.

[0032] Figure 5 is a schematic diagram of a 1577nm laser transmitting optical path diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application.

[0033] Figure 6 is a schematic diagram of a 490nm laser transmitting optical path diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application.

[0034] Figure 7 is a schematic diagram of a 1270nm laser receiving optical path diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application.

[0035] Figure 8 is a schematic diagram of a 1286nm laser receiving optical path diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application. Figure 1 .

[0036] Figure 9 is a schematic diagram of a 1286nm laser receiving optical path diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application.

[0037] Figure 10 is a schematic diagram of a 1310nm laser receiving optical path diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application. Figure 1 .

[0038] Figure 11 is a schematic diagram of a 1310nm laser receiving optical path diagram of a COMBO PON optical device of three transmitters and three receivers of Embodiment Three of the present application. Figure 2 .

[0039] Figure 12Prior art schematic Figure 1 .

[0040] Figure 13 Prior art schematic Figure 2 .

[0041] BRIEF DESCRIPTION OF DRAWINGS: 10, device body; 1, transmitting component assembly; 101, 45º filter one; 102, 45º filter two; 103, 45º filter three; 104, laser one; 105, laser two; 106, laser three; 107, main body; 2, detector one; 3, detector two; 4, detector three; 5, adapter; 6, receiving part assembly; 601, prism one; 602, prism two; 603, filter one; 604, filter two; 605, filter three; 606, filter four; 607, filter five; 608, filter six. DETAILED DESCRIPTION

[0042] The following description will be made in conjunction with the accompanying drawings Figures 1-11 The application is further described in detail.

[0043] The embodiment of the application discloses a three-transmitting and three-receiving COMBO PON optical device. Referring to Figures 1-3 , comprising a device body 10, the device body 10 comprising a transmitting component assembly 1 and a receiving part assembly 6; The 45º filter one 101, the 45º filter two 102 and the 45º filter three 103 are arranged on one side of the inner cavity of the main body 107 of the transmitting component assembly 1 from top to bottom, the 45º filter one 101 transmits 1342 nm and reflects 1490 nm and 1577 nm, the 45º filter two 102 transmits 1490 nm and reflects 1577 nm, and the 45º filter three 103 reflects 1490 nm, the 45º filter one 101, the 45º filter two 102 and the 45º filter three 103 are arranged and installed in the same angle and state, the laser one 104, the laser two 105 and the laser three 106 are arranged on the other side of the inner cavity of the main body 107 from top to bottom, the laser one 104, the laser two 105 and the laser three 106 are installed in the same angle and state position, each group of lasers corresponds to a piece of 45º filter (1342 nm, 1490 nm, 1577 nm), through the transmission / reflection characteristics of the filter, different wavelength optical signals are efficiently multiplexed and output in the same optical path, the technical function of multiplexing multiple wavelength optical signals is realized, the 45º filters and the lasers are arranged in the same angle and are symmetrical, the stability of the light beam direction is ensured, the optical path deviation is reduced, the stability and the coupling precision of the optical signal are improved, and through the collinear design of the three groups of lasers and the three pieces of filters, the multiple wavelength light beams are realized to be output in the same line in the limited cavity, space is saved, and the compactness of the transmitting end is improved; The receiving part assembly 6 comprises the probe one 2, the probe two 3, the probe three 4 and the adapter 5, the probe one 2 is located at the upper end of the receiving part assembly 6, the probe three 4 is located at the lower end of the receiving part assembly 6, the center lines of the probe one 2 and the probe three 4 are consistent, the probe two 3 is located at one side of the center lines of the probe one 2 and the probe three 4, the probe adopts InGaAs PIN photodiode, combined with the selective transmission / reflection of the optical filter, the low-noise and high-sensitivity optical signal reception is realized, and the probe one and the probe three are arranged on the center line, and the probe two is arranged on one side, combined with the filter / prism combination, the different wavelength channels are effectively isolated, and the uplink and downlink signal interference is reduced. The prism one 601 and the prism two 602 are respectively arranged at the center line positions of the probe one 2 and the probe three 4 from bottom to top, the optical filter one 603 is arranged at the lower end of the prism one 601, the optical filter one 603 transmits 1270nm and reflects 1286nm-1310nm, the optical filter three 605 is arranged at the upper end of the prism one 601, the optical filter three 605 transmits 1286nm-1310nm and reflects 1270nm, the optical filter three 605 is located at the middle position of the prism one 601 and the prism two 602, the optical filter six 608 is arranged at the upper end of the prism two 602, the optical filter six 608 transmits 1286nm and reflects 1310nm, the optical filter four 606 is arranged at the side of the prism two 602 close to the probe two 3, the optical filter four 606 transmits 1310nm and reflects 1286nm, the optical filter five 607 is arranged at the side of the prism two 602 away from the probe two 3, the optical filter five 607 reflects 1310nm&1286nm, the optical filter two 604 is arranged at the side of the prism two 602 away from the adapter 5, the optical filter two 604 transmits 1342nm-1577nm and reflects 1270nm-1310nm, the prism one 601 and the prism two 602 respectively match the multi-layer band-pass filter, the high-precision separation of the optical signals of different wavelengths (1270nm-1342nm, 1286nm-1310nm) is realized, the prism+filter combination reduces the number of required filters, shortens the optical path length, makes the overall size of the device smaller, and facilitates packaging into the SFP-DD module. The isolation cavity structure effectively blocks the interference of the transmitting end optical path on the receiving end, ensures the independent transmission of the uplink and downlink signals, has low crosstalk and high isolation, the coaxial alignment structure ensures that the optical axes coincide within ±0.1°, improves the optical signal transmission efficiency, reduces the optical power loss, and the metal shielding shell+internal heat conduction channel reduces the temperature rise of the laser, suppresses electromagnetic interference, prolongs the service life of the device, and improves the system stability.

[0044] Reference Figure 4 , Figure 4is the 1342nm laser emitting light path diagram, after the 1342nm laser diode emits laser, it is converted into parallel light through collimating lens, directly transmits through 45-degree filter sheet one 603, the filter sheet can transmit 1342nm, reflect 1577nm and 1490nm wavelength laser, emits from the center of light outlet, converts into linearly polarized light through isolator, completely transmits through PBS prism one 601, is coupled into the adapter with converging C-lens.

[0045] Referring to Figure 5 , Figure 5 is the 1577nm laser emitting light path diagram, after the 1577nm laser diode emits laser, it is converted into parallel light through collimating lens, is reflected at 45-degree filter sheet two 604, the filter sheet can reflect 1577nm, transmit 1490nm, laser is reflected at 45-degree filter sheet one 603, emits from the center of isolator, converts into linearly polarized light, completely transmits through PBS prism one 601, is coupled into the adapter with converging C-lens.

[0046] Referring to Figure 6 , Figure 6 is the 1490nm laser emitting light path diagram, after the 1490nm laser diode emits laser, it is converted into parallel light through collimating lens, is reflected at 45-degree filter sheet three 605, the filter sheet can reflect 1490nm, laser transmits upwards through 45-degree filter sheet two 604, is reflected at 45-degree filter sheet one 603, emits from the center of isolator, converts into linearly polarized light, completely transmits through PBS prism one 601, is coupled into the adapter with converging C-lens.

[0047] Referring to Figure 7 , Figure 7 is the 1270nm laser receiving light path diagram, after 1270nm laser is incident from outside, it is converted into parallel light through the C-lens of adapter, directly strikes on PBS prism one 601, is divided into two mutually perpendicular polarized lights according to the polarization direction, is divided into transmitted light and reflected light, wherein the transmitted light is reflected by filter sheet two 604, changes 90° in polarization direction after passing through quarter-wave plate twice, and reaches PBS prism one 601 again, is reflected, and then transmits downwards through filter sheet one 603; the reflected light is reflected at filter sheet three 605, changes 90° in polarization direction after passing through quarter-wave plate twice, transmits through PBS prism one 601, and transmits through filter sheet one 603. The final reflected light and transmitted light are all received and coupled at the "1270nm detector".

[0048] Referring to Figure 8 , Figure 9 , Figure 8 and Figure 9is 1286nm laser receiving optical path diagram, in 1286nm laser incident to PBS prism one 601, same into two polarized direction perpendicular to each other's reflected light and transmitted light, wherein the reflected light passes through the filter three 605; transmitted light passes through PBS prism one 601, at the filter two 604, after two wave plates, the polarization direction changes 90°, return to PBS prism one 601 place and reflect, shoot to filter one 603, and reflect again at filter one 603, two times through wave plate, the polarization direction changes 90° again, return and pass through PBS prism, through filter two 604; That is, the polarization direction of the two 1286nm light can pass through filter three 605 to PBS prism two 602, then again into two polarized direction perpendicular to each other's reflected light and transmitted light, transmitted light directly through filter six 608, reflected light at filter four 606, two times through quarter wave plate, the polarization direction changes 90°, after transmitting through PBS prism two 602, at filter five 607, reflect again, two times through quarter wave plate, the polarization direction changes 90° again, reflect at PBS prism two 602, through filter 6, that is, transmitted light and reflected light are received and coupled in "1286nm detector".

[0049] Referring to Figure 10 , Figure 11 , Figure 10 and Figure 11 is 1310nm laser receiving optical path diagram, 1310nm laser in PBS prism 1 optical path is same with 1286nm, incident to PBS prism two 602, 1310nm laser same into polarized direction perpendicular to each other's reflected light and transmitted light, reflected light directly through filter four 606; transmitted light at filter six 608, after two quarter wave plates, the polarization direction changes 90°, reflect at PBS prism two 602, to filter five 607, reflect again, two times through quarter wave plate, the polarization direction changes 90° again, transmit at PBS prism, and through filter four 606, that is, transmitted light and reflected light are received and coupled in "1310nm detector".

[0050] Example 1 This embodiment discloses a three-transmitting and three-receiving COMBO PON optical device. Referring to Figures 1-3, including a device body 10, the device body 10 including a transmitting component assembly 1 and a receiving component assembly 6, the main body 107 of the transmitting component assembly 1 having a cavity with a first side from top to bottom provided with a 45º filter one 101, a 45º filter two 102 and a 45º filter three 103, wherein the 45º filter one 101 transmits a 1342 nm optical signal and reflects 1490 nm and 1577 nm optical signals; the 45º filter two 102 transmits a 1490 nm optical signal and reflects a 1577 nm optical signal; the 45º filter three 103 reflects a 1490 nm optical signal, and the three filters are installed at the same angle and state, and a second side of the cavity of the main body 107 is provided from top to bottom with a laser one 104, a laser two 105 and a laser three 106, which are installed correspondingly with the corresponding filters one by one, to realize efficient multiplexing output of multiple wavelength optical signals in the same optical path; Figure 4 A 1342 nm laser emitting optical path is shown: after the laser 104 emits laser, the parallel light is converted by a collimating lens, passes through the 45º filter one 101, is converted into linearly polarized light by an isolator, and then passes through the PBS prism one 601, and finally is coupled to the adapter 5 with a converging C-lens, to realize efficient output of optical signals, Figure 5 A 1577 nm optical path is shown, Figure 6 A 1490 nm optical path is shown, which realizes collinear output of three wavelength optical signals through filter reflection / transmission and PBS prism coupling; The receiving component assembly 6 includes a detector one 2, a detector two 3, a detector three 4 and an adapter 5, the detector one and the detector three are arranged along the center line, the detector two is arranged offset, the prism one 601 is combined with the prism two 602 and the multi-layer filter to realize high-precision separation and reception of 1270 nm, 1286 nm and 1310 nm wavelength optical signals, all the detectors use InGaAs PIN photodiode structure to improve the receiving sensitivity; the isolation cavity structure effectively blocks the interference of the transmitting end optical path on the receiving end, realizes low crosstalk and high isolation degree of the uplink and downlink signals, the coaxial alignment structure ensures that the optical axes coincide within ±0.1°, improves the optical coupling efficiency and reduces the insertion loss. The device shell is made of metal shielding material and is provided with a heat conduction channel, which reduces the working temperature rise of the laser, suppresses electromagnetic interference, improves the system stability and the service life of the device.

[0051] The embodiment 1 realizes the technical effects of transmitting end multiple wavelength multiplexing, receiving end multiple wavelength high-precision separation, compact packaging, low crosstalk, high optical coupling efficiency and thermal stability.

[0052] Embodiment 2 The embodiment is further optimized on the basis of embodiment 1, the wavelength layout of the emission optical path, respectively for 1342nm, 1490nm and 1577nm multi-wavelength multiplexing, the angle of the emission end laser and the filter is consistent, ensure the stability of the light beam direction, and adopt the collinear optical path design, realize the collinear output of multi-wavelength optical signal in the limited cavity space, improve the optical energy utilization rate and compactness of the emission end; In the receiving part component 6, the prism one 601 and the prism two 602 are combined with the filter to realize high-precision separation of 1270nm, 1286nm, 1310nm wavelength optical signal, combined with polarization beam splitting and quarter-wave plate adjustment, to ensure that optical signals of different polarization directions can be accurately coupled to the corresponding detector, improving the receiving sensitivity and wave separation precision; Through the isolation cavity structure and coaxial alignment structure, the cross talk from the emission end to the receiving end is reduced, the optical axis coincidence degree is controlled within ±0.1°, the optical signal coupling efficiency is improved and the optical loss is reduced. The metal shielding shell and the internal heat conduction channel ensure the temperature stability of the laser, prolong the service life of the device.

[0053] Embodiment 2 realizes optical path collineation, high-precision receiving and multi-wavelength multiplexing / wave separation optimization, while ensuring system stability and compact packaging performance.

[0054] Embodiment 3 This embodiment further optimizes the material and coating treatment of optical elements on the efficiency of optical signal, prism one 601 and prism two 602 are made of full reflection glass material, and the reflecting surface is coated to improve the reflection efficiency of optical signal and reduce the optical loss, filter one 603 to filter six 608 adopt multi-layer band-pass filter, the center wavelength corresponds to the emission and receiving wavelength, realize the selective transmission and reflection of specific wavelength optical signal; The emission end laser is combined with the filter, and through transmission / reflection, the 1342nm, 1490nm, 1577nm optical signal is multiplexed and output in the same optical path, ensuring stable and collinear output of the light beam, and the receiving end optical path realizes high-precision wave separation of multi-wavelength optical signal through PBS prism+filter+quarter-wave plate combination, ensuring that each wavelength optical signal is coupled to the corresponding detector without cross talk, improving the receiving sensitivity and system stability; The isolation cavity and coaxial alignment structure reduce the interference between uplink and downlink optical paths, improve the coupling efficiency, the device shell adopts metal shielding material and internal heat conduction channel design, realizes heat management and electromagnetic interference suppression, ensures the long-term stable work of the device.

[0055] Embodiment 3 realizes the optimization of optical material, the improvement of reflection efficiency, the high-precision multiplexing and wave separation of optical signal, while ensuring the thermal stability and compact packaging characteristics of the device.

[0056] Embodiment 4 The embodiment is based on embodiments 1-3, and the optical path design of the receiving end is optimized, so that the 1270 nm, 1286 nm, 1310 nm and other wavelength optical signals realize multiple reflection and transmission in the PBS prism one 601 and the prism two 602, the polarization direction is adjusted through the quarter-wave plate, and finally coupled to the corresponding detector with high precision, realizing the full polarization reception of the optical signal, improving the receiving sensitivity and signal-to-noise ratio, and the combination of the filter one 603 to the filter six 608 reduces the number of required filters, shortens the optical path length, and makes the overall size of the device smaller, facilitating packaging into compact modules such as SFP-DD. The isolation cavity structure ensures effective isolation of the transmitting end optical path and the receiving end optical path, low crosstalk and high isolation. Coaxial alignment ensures that the optical axis coincides to ±0.1°, improves the optical coupling efficiency and system reliability.

[0057] The technical effects of embodiment 4 include accurate reception of multiple polarization direction optical signals, compact optical path, low crosstalk and high optical coupling efficiency, meeting the requirements of high-speed PON optical access network for multiple wavelengths, high integration and high reliability.

[0058] Embodiment 5 The embodiment further optimizes the comprehensive performance of the system, including collinear multiplexing of the transmitting end multiple wavelength optical signals, high precision wave division of the receiving end multiple wavelength optical signals, polarization light control, low crosstalk of the isolation cavity, coaxial optical axis alignment and thermal management design, the transmitting end lasers 104, 105, 106 are respectively corresponding to the 45º filters 101, 102, 103, and the transmission / reflection combination realizes multiple wavelength multiplexing output; the receiving end PBS prism one 601 and prism two 602 combined with filters 603~608 realize accurate wave division of multiple wavelengths, and polarization light adjustment ensures the receiving efficiency; the isolation cavity and the metal shielding shell realize optical interference blocking and thermal management.

[0059] Embodiment 5 realizes multiple wavelength efficient multiplexing and wave division, low insertion loss, high optical coupling efficiency, compact optical path, thermal stability and system reliability, and is suitable for SFP-DD small modules and high-speed FTTx access network.

[0060] The implementation principle of the COMBO PON optical device with three transmitters and three receivers according to an embodiment of the present application is as follows: three groups of lasers (1342 nm, 1490 nm, and 1577 nm) are arranged in line with corresponding 45º filters at the transmitting end, the transmission / reflection characteristics of the filters are used to multiplex different wavelength optical signals in the same optical path, the direction of the optical beam is ensured to be stable, the optical path deviation is reduced, and the multi-wavelength light is output in line in the limited cavity space, thereby saving space and improving compactness; the center lines of the detector 2, the detector 3, and the detector 4 are arranged and offset at the receiving end, and the prism 1 601, the prism 2 602, and the multi-layer band-pass filter combination are combined to realize high-precision separation of 1270 nm, 1286 nm, and 1310 nm wavelength optical signals; the PBS prism and the quarter-wave plate are used to adjust the polarization direction, so that optical signals with different polarization directions can be accurately coupled to the corresponding detector, the receiving sensitivity and the signal-to-noise ratio are improved, the isolation cavity structure effectively blocks the interference of the transmitting end optical path on the receiving end, realizes independent transmission of the uplink and downlink signals, and ensures low crosstalk and high isolation; the coaxial alignment structure ensures that the optical axis coincidence degree is within ±0.1°, improves the optical coupling efficiency, reduces the optical power loss, the metal shielding shell is combined with the internal heat conduction channel design, effectively reduces the temperature rise of the laser, suppresses electromagnetic interference, prolongs the service life of the device, and maintains long-term stable operation of the system, and through the combination of various technical measures such as multi-wavelength multiplexing at the transmitting end, high-precision wave separation at the receiving end, polarization light control, low crosstalk of the isolation cavity, compact packaging, and heat management, the technical effect of efficient and stable transmission of optical signals is realized.

[0061] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A three-transmit three-receive COMBO PON optical device, characterized by: It comprises a device body (10), the device body (10) comprises a transmitting component assembly (1) and a receiving part assembly (6); The inner cavity of the main body (107) of the transmitting component assembly (1) is provided with a 45º filter one (101), a 45º filter two (102) and a 45º filter three (103) from top to bottom on one side, the 45º filter one (101), the 45º filter two (102) and the 45º filter three (103) are installed in the same angle and state, the inner cavity of the main body (107) is provided with a laser one (104), a laser two (105) and a laser three (106) from top to bottom on the other side, the laser one (104), the laser two (105) and the laser three (106) are installed in the same angle and state position; The receiving part assembly (6) comprises a detector one (2), a detector two (3), a detector three (4) and an adapter (5), the detector one (2) is located at the upper end of the receiving part assembly (6), the detector three (4) is located at the lower end of the receiving part assembly (6), the center line of the detector one (2) is consistent with that of the detector three (4); The detector two (3) is located on one side of the center line of the detector one (2) and the detector three (4); The center line position of the detector one (2) and the detector three (4) is respectively provided with a prism one (601) and a prism two (602) from bottom to top, the lower end of the prism one (601) is provided with a filter one (603), the upper end of the prism one (601) is provided with a filter three (605), the filter three (605) is located at the middle position of the prism one (601) and the prism two (602); The upper end side of the prism two (602) is provided with a filter six (608), the side close to the detector two (3) of the prism two (602) is provided with a filter four (606), the side away from the detector two (3) of the prism two (602) is provided with a filter five (607), and the side away from the adapter (5) of the prism two (602) is provided with a filter two (604).

2. The three-transmit-three-receive COMBO PON optical device of claim 1, wherein: The 45º filter one (101), the 45º filter two (102) and the 45º filter three (103) are respectively used for separating or combining different wavelength optical signals, and preferably correspond to 1310 nm, 1490 nm and 1550 nm three kinds of wavelength signals.

3. The optical device of claim 2, wherein: The laser one (104), the laser two (105) and the laser three (106) are respectively arranged corresponding to the filter one (101), the filter two (102) and the filter three (103), and are used for emitting different wavelength optical signals to realize multi-wavelength multiplexing transmission.

4. The optical device of claim 1, wherein: The prism one (601) and the prism two (602) are both made of full reflection glass material, and the reflection surface thereof is treated by coating to improve the reflection efficiency of optical signals and reduce signal loss.

5. The optical device of claim 1, wherein: The filter one (603), filter two (604), filter three (605), filter four (606), filter five (607) and filter six (608) are all band-pass filters, the center wavelength of which corresponds to the emission wavelength and the receiving wavelength one by one, for selectively transmitting or reflecting light signals of specific waveband.

6. The optical device of claim 1, wherein: The adapter (5) is a standard SC / APC or LC / APC optical fiber interface, for reliable connection with external optical fiber communication network, realizing input and output coupling of optical signals.

7. The optical device of claim 1, wherein: The probe one (2), probe two (3) and probe three (4) correspond to downlink receiving signals of different wavelengths respectively, preferably adopting InGaAs PIN photodiode structure to improve receiving sensitivity.

8. The optical device of claim 1, wherein: The emission component assembly (1) and the receiving component assembly (6) in the inner cavity of the main body (107) are divided by an isolation cavity structure, for reducing optical crosstalk between the emission end and the receiving end.

9. The optical device of claim 1, wherein: The emission component assembly (1) and the receiving component assembly (6) are fixed by coaxial alignment structure, so that the coincidence degree of optical axes is controlled within ±0.1°, to ensure high coupling efficiency and low insertion loss.

10. The optical device of claim 1, wherein: The device body (10) shell is made of metal shielding material, and a heat conduction channel is arranged inside, for reducing temperature rise of the laser and improving overall stability and life of the device.

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