CN110391845A - Optical transceiver, optical transceiver module and optical communication system - Google Patents
Optical transceiver, optical transceiver module and optical communication system Download PDFInfo
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- CN110391845A CN110391845A CN201910673608.3A CN201910673608A CN110391845A CN 110391845 A CN110391845 A CN 110391845A CN 201910673608 A CN201910673608 A CN 201910673608A CN 110391845 A CN110391845 A CN 110391845A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 351
- 238000004891 communication Methods 0.000 title claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 238000011084 recovery Methods 0.000 claims description 50
- 239000013307 optical fiber Substances 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 claims description 15
- 238000003745 diagnosis Methods 0.000 claims description 11
- 239000000523 sample Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 7
- 238000013154 diagnostic monitoring Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 abstract description 2
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 230000011514 reflex Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000002457 bidirectional effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
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- 230000010287 polarization Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
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- 230000001960 triggered effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4274—Electrical aspects
- G02B6/428—Electrical aspects containing printed circuit boards [PCB]
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4298—Coupling light guides with opto-electronic elements coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
This application involves a kind of optical transceiver, optical transceiver module and optical communication system, one of optical transceiver, including FP laser, detector, wavelength-division multiplex optical filter and circuit board；Circuit board is separately connected FP laser and detector；Wavelength-division multiplex optical filter is set to the infall of the transmitting optical path of FP laser and the receiving light path of detector；The first electric signal triggering FP laser from circuit board generates the first optical signal, and transmitting optical path in the first optical signal edge exports after penetrating wavelength-division multiplex optical filter；Second optical signal is transferred to wavelength-division multiplex optical filter along receiving light path；Wavelength-division multiplex optical filter reflexes to the second optical signal at detector；Second optical signal is converted to the second electric signal by detector, and by the second electric signal transmission to circuit board.The application realizes the 5G optic communication of single fiber bi-directional, and avoids in 5G forward pass, and dropout caused by causing receiving end to be saturated since optical power is excessively high improves the reliability of 5G communication.
Description
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to an optical transceiver, an optical transceiver module, and an optical communication system.
Background
With the development of Communication Technology, 5G Communication (the fifth Generation Mobile Communication Technology) has emerged. The receiving end and the transmitting end of the 25Gbps single-fiber bidirectional optical module applied to the 5G wireless fronthaul respectively adopt a DFB (Distributed feedback laser) and a PIN receiver (photodiode receiver), the wavelengths of the DFB and the PIN receiver are respectively 1270nm (nanometer) of the transmitting end and 1330nm of the receiving end, and 1330nm of the transmitting end and the receiving end are 1270nm of the transmitting end, and the DFB and the PIN receiver are used in combination, so that the 5G wireless fronthaul signal is received and transmitted.
However, in the implementation process, the inventor finds that at least the following problems exist in the conventional technology: when the current optical transceiver transmits 5G signals, signal loss is easy to occur.
Disclosure of Invention
In view of the above, it is desirable to provide an optical transceiver, an optical transceiver module, and an optical communication system that can avoid loss of signals when transmitting 5G signals.
In order to achieve the above object, an embodiment of the present application provides an optical transceiver including an FP laser, a detector, a wavelength division multiplexing filter, and a circuit board; the circuit board is respectively connected with the FP laser and the detector; the wavelength division multiplexing filter is arranged at the intersection of the transmitting light path of the FP laser and the receiving light path of the detector;
triggering the FP laser by a first electric signal from the circuit board to generate a first optical signal, and outputting the first optical signal after the first optical signal penetrates through the wavelength division multiplexing optical filter along an emission optical path;
the second optical signal is transmitted to the wavelength division multiplexing optical filter along the receiving optical path; the wavelength division multiplexing optical filter reflects the second optical signal to a detector; the detector converts the second optical signal into a second electric signal and transmits the second electric signal to the circuit board;
the first electrical signal, the second electrical signal, the first optical signal and the second optical signal are all 5G signals.
In one embodiment, the circuit board comprises a control circuit, a digital diagnosis monitoring circuit, a laser driving circuit, a first clock data recovery circuit and a second clock data recovery circuit which are connected with an external electric signal processing circuit;
the control circuit is respectively connected with the digital diagnosis monitoring circuit, the laser driving circuit, the first clock data recovery circuit and the second clock data recovery circuit;
the first clock data recovery circuit is connected with the laser driving circuit; the laser driving circuit is connected with the FP laser; the second clock data recovery circuit is connected to the detector.
In one embodiment, the circuit board further comprises a transimpedance amplifier and a limiting amplifier;
the second clock data recovery circuit is connected with the detector through the limiting amplifier and the trans-impedance amplifier in sequence.
In one embodiment, the optical transceiver further comprises a monitor photodiode connected to the circuit board.
In one embodiment, the circuit board further comprises a power management circuit;
the power management circuit is respectively connected with the control circuit, the digital diagnosis monitoring circuit, the laser driving circuit, the first clock data recovery circuit and the second clock data recovery circuit.
In one embodiment, the FP laser rate includes 25Gbps or more than 25 Gbps;
the first optical signal and the second optical signal have different wavelengths.
In one embodiment, the first optical signal has a wavelength of 1310 nm and the second optical signal has a wavelength of 1550 nm;
or,
the first optical signal has a wavelength of 1550 nm and the second optical signal has a wavelength of 1310 nm.
In one embodiment, the probe is a PIN probe.
The embodiment of the application provides an optical transceiver module, which comprises a base, an optical fiber adapter and the optical transceiver of any one of the embodiments;
the base comprises a cavity, a first opening arranged along a first optical axis, a second opening arranged along a second optical axis, and a third opening arranged along the first optical axis or the second optical axis; the first opening, the second opening and the third opening are all used for communicating the chamber with the outside;
the FP laser is arranged at the first opening; the detector is arranged at the second opening; the fiber adapter is arranged at the third opening; the wavelength division multiplexing optical filter is arranged in the cavity and is positioned at the intersection of the first optical axis and the second optical axis.
In one embodiment, the wavelength division multiplexing filter is fixed in the cavity and forms an included angle with the first optical axis, wherein the included angle is a preset angle.
Embodiments of the present application further provide a communication system comprising an optical fiber, and a plurality of optical transceivers according to any of claims 1 to 7; the optical fibers are respectively connected with the optical transceivers.
In one embodiment, the number of optical transceivers is two;
the wavelength of a first optical signal emitted by any FP laser is 1310 nanometers; the wavelength of a first optical signal emitted by the other FP laser is 1550 nanometers;
the wavelength of the second optical signal received by any detector is 1550 nanometers; the wavelength of the first optical signal received by the other detector is 1310 nm.
One of the above technical solutions has the following advantages and beneficial effects:
the circuit board is respectively connected with the FP laser and the detector, and the wavelength division multiplexing optical filter is arranged at the intersection of the transmitting optical path of the FP laser and the receiving optical path of the detector, so that the first electric signal can trigger the FP laser to generate a first optical signal, and the first optical signal is output after penetrating through the wavelength division multiplexing optical filter along the transmitting optical path, thereby realizing the output of the 5G uplink optical signal; meanwhile, a second optical signal is transmitted to the wavelength division multiplexing optical filter along the receiving optical path, the wavelength division multiplexing optical filter reflects the second optical signal to the detector, the second optical signal is converted into a second electrical signal through the detector, and the second electrical signal is transmitted to the circuit board, so that the 5G downlink optical signal is received, single-fiber bidirectional 5G optical communication is realized, signal loss caused by receiving end saturation due to overhigh optical power in 5G fronthaul is avoided, and the reliability of the 5G communication is improved.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.
FIG. 1 is a schematic block diagram of an optical transceiver in one embodiment;
FIG. 2 is a block diagram of a first circuit connection of a circuit board in one embodiment;
FIG. 3 is a second circuit connection block diagram of a circuit board in one embodiment;
FIG. 4 is a third circuit connection block diagram of a circuit board in one embodiment;
FIG. 5 is a first schematic block diagram of an optical transceiver module in one embodiment;
FIG. 6 is a second schematic block diagram of an optical transceiver module in one embodiment;
fig. 7 is a schematic block diagram of an optical communication system in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "disposed on," "disposed on," and the like are used herein for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
At present, a DFB laser is used at a receiving end of a single-fiber bidirectional optical module applied to 5G communication, a PIN detector is used at the receiving end, and 5G communication can be realized through wavelengths of 1270nm and 1330nm by designing internal structures of the optical module corresponding to the DFB laser and the PIN detector.
However, since the communication frequency used in 5G communication is very high, it is determined that the arrangement density of 5G base stations is large, the transmission distance between most 5G optical modules is less than or equal to 2 km, and when a DFB laser is used for 5G communication, the receiving end of the optical module is easily saturated due to excessive optical power, so that the 5G signal is lost.
Further, to prevent the emitted optical signal from entering the DFB laser to generate signal crosstalk, an optical isolator is required in the optical module. When the polarization directions of the DFB laser chip and the optical isolator are consistent, the optical power insertion loss is minimum, so that the polarization direction of the optical module after the isolator is assembled needs to be strictly controlled in the packaging of the optical module, and the assembly difficulty of the optical module is increased. Meanwhile, the price of the isolator is expensive, and if a DFB laser scheme is adopted, the cost of the optical module is high. Meanwhile, the internal structure and the manufacturing process of a laser chip of the DFB laser are complex, and the difficulty of a coating process in a post process is high, so that the yield of the DFB laser is low in the production process. Meanwhile, the DFB laser has a slow growth speed and a long processing period, which results in high cost of the DFB laser.
The optical transceiver in this application includes FP laser instrument, detector and wavelength division multiplexing filter, has realized the two-way 5G optical communication of single fiber, avoids in the 5G fronthaul, because the optical power is too high causes the signal loss that the receiving terminal saturation leads to, has improved the reliability of 5G communication. Meanwhile, the cost can be reduced through the optical transceiver shown in the application.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, an optical transceiver is provided, comprising an FP laser 110, a detector 120, a wavelength division multiplexing filter 130, and a circuit board; the circuit board is respectively connected with the FP laser 110 and the detector 120; the wavelength division multiplexing filter 130 is arranged at the intersection of the transmitting light path of the FP laser 110 and the receiving light path of the detector 120;
a first electric signal from the circuit board triggers the FP laser 110 to generate a first optical signal, and the first optical signal is output after passing through the wavelength division multiplexing optical filter 130 along the emission optical path;
the second optical signal is transmitted to the wavelength division multiplexing optical filter 130 along the receiving optical path; the wavelength division multiplexing filter 130 reflects the second optical signal to the detector 120; the detector 120 converts the second optical signal into a second electrical signal and transmits the second electrical signal to the circuit board;
the first electrical signal, the second electrical signal, the first optical signal and the second optical signal are all 5G signals.
Specifically, the optical transceiver is used to implement an electrical-to-optical conversion and an optical-to-electrical conversion, that is, to convert an electrical signal into an optical signal and transmit the optical signal to the optical fiber along a transmitting optical path, and transmit the optical signal transmitted by the optical fiber along a receiving optical path, and convert the received optical signal into an electrical signal through the detector 120. For convenience of description, the "upstream signal" in this application refers to a signal transmitted from the optical transceiver to the outside, and the "downstream signal" refers to a signal received from the optical transceiver to the outside. For example, "upstream optical signal" indicates an optical signal transmitted to the outside by the optical transceiver, "downstream optical signal" indicates an optical signal transmitted to the outside by the optical transceiver, "upstream electrical signal" indicates an electrical signal transmitted to the outside by the optical transceiver, and "downstream electrical signal" indicates an electrical signal transmitted to the outside by the optical transceiver.
The wavelength division multiplexing filter 130 is configured to transmit the first optical signal and the second optical signal along different optical paths, where transmission tracks of the first optical signal and the second optical signal after passing through the wavelength division multiplexing filter 130 are different. The wavelength division multiplexing filter 130 may transmit light of a specific wavelength and reflect light of other wavelengths, so that the light of the specific wavelength and the light of other wavelengths may be transmitted along different transmission traces. In this embodiment, the wavelength division multiplexing filter 130 is used to transmit the first optical signal along the transmitting optical path and reflect the second optical signal along the receiving optical path.
The wavelength division multiplexing filter 130 is disposed at the intersection of the transmitting optical path and the receiving optical path, wherein a transmitting optical path may be formed among the FP laser 110, the wavelength division multiplexing filter 130 and the optical fiber, so that the first optical signal generated by the FP laser 110 may be conducted into the optical fiber. The first electrical signal from the circuit board triggers the FP laser 110 to generate a first optical signal, and the first optical signal is output along the emission optical path after passing through the wavelength division multiplexing filter 130.
A receiving optical path may be formed between the detector 120, the wavelength division multiplexing filter 130 and the optical fiber, so that the second optical signal transmitted by the optical fiber may be conducted to the detector 120. The second optical signal is transmitted to the wavelength division multiplexing filter 130 along the receiving optical path, the wavelength division multiplexing filter 130 reflects the second optical signal to the detector 120, and the detector 120 converts the second optical signal into a second electrical signal and transmits the second electrical signal to the circuit board.
The wavelength division multiplexing filter 130 may form an included angle with the emission optical path, so as to reflect the second optical signal and enable the reflected second optical signal to reach the detector 120. In one example, the emission light path may be a directed line segment pointing from the FP laser 110 to the optical fiber, and the wavelength division multiplexing filter 130 may form an angle of 45 degrees with the emission light path; or the wavelength division multiplexing filter 130 may form an angle of 135 degrees with the emission light path.
The circuit board is respectively connected with the FP laser 110 and the detector 120, so that a first electric signal can be generated, the FP laser 110 is triggered by the first electric signal to generate a first optical signal, and the transmission of downlink signals is realized; meanwhile, the second electrical signal transmitted by the detector 120 may also be received, so as to implement transmission of the uplink signal.
The FP laser 110, that is, the fabry-perot laser is used to generate the downlink optical signal, the structure is simpler than that of the DFB, specifically, the wafer growth and processing process of the FP laser 110 is simpler than that of the DFB laser, so that the yield of the FP laser 110 is higher than that of the DFB laser, and the cost of the FP laser 110 is lower than that of the DFB laser. Meanwhile, when the FP laser 110 is used in an application scene within 2 kilometers of a short distance, the optical power is low, and the risk of signal loss caused by saturation of a receiving end in the application scene within 2 kilometers of 5G wireless forward transmission can be effectively avoided. Meanwhile, the reflected light in the optical path is very small, and the coating film of the FP laser 110 itself has the radiation-resistant capability, so that an optical isolator does not need to be added in the optical transceiver, thereby reducing the assembly process and the overall cost.
In the optical transceiver, the circuit board is respectively connected to the FP laser 110 and the detector 120, and the wavelength division multiplexing filter 130 is disposed at the intersection of the transmitting optical path of the FP laser 110 and the receiving optical path of the detector 120, so that the first electrical signal can trigger the FP laser 110 to generate the first optical signal, and the first optical signal is output after passing through the wavelength division multiplexing filter 130 along the transmitting optical path, thereby outputting the 5G uplink optical signal; meanwhile, the second optical signal is transmitted to the wavelength division multiplexing optical filter 130 along the receiving optical path, the wavelength division multiplexing optical filter 130 reflects the second optical signal to the detector 120, the second optical signal is converted into a second electrical signal through the detector 120, and the second electrical signal is transmitted to the circuit board, so that the 5G downlink optical signal is received, single-fiber bidirectional 5G optical communication is realized, signal loss caused by receiving end saturation due to overhigh optical power in 5G fronthaul is avoided, and the reliability of the 5G communication is improved.
In one embodiment, an optical transceiver is provided that includes an FP laser 110, a detector 120, a wavelength division multiplexing filter 130, and a circuit board; the circuit board is respectively connected with the FP laser 110 and the detector 120; the wavelength division multiplexing filter 130 is arranged at the intersection of the transmitting light path of the FP laser 110 and the receiving light path of the detector 120;
a first electric signal from the circuit board triggers the FP laser 110 to generate a first optical signal, and the first optical signal is output after passing through the wavelength division multiplexing optical filter 130 along the emission optical path;
the second optical signal is transmitted to the wavelength division multiplexing optical filter 130 along the receiving optical path; the wavelength division multiplexing filter 130 reflects the second optical signal to the detector 120; the detector 120 converts the second optical signal into a second electrical signal and transmits the second electrical signal to the circuit board;
the first electrical signal, the second electrical signal, the first optical signal and the second optical signal are all 5G signals.
As shown in fig. 2, the circuit board includes a control circuit 210, a digital diagnosis monitoring circuit 220, a laser driving circuit 230, and a first clock data recovery circuit 240 and a second clock data recovery circuit 250, which are used to connect with an external electrical signal processing circuit;
the control circuit 210 is respectively connected with the digital diagnosis monitoring circuit 220, the laser driving circuit 230, the first clock data recovery circuit 240 and the second clock data recovery circuit 250;
the first clock data recovery circuit 240 is connected with the laser driving circuit 230; the laser driving circuit 230 is connected with the FP laser 110; the second clock data recovery circuit 250 is connected to the detector 120.
Specifically, the circuit board includes a control circuit 210, a digital diagnostic monitoring circuit 220, a laser driving circuit 230, a first clock data recovery circuit 240, and a second clock data recovery circuit 250. The digital diagnostic monitoring circuit 220 has a monitoring function, and can monitor characteristic parameters of the optical transceiver in real time, for example, the temperature, the supply voltage, the bias current, the transmitting power, the receiving power, and the like of the optical transceiver can be reported in real time, and meanwhile, the digital diagnostic monitoring circuit 220 also has a diagnostic function, and can know whether the optical transceiver is in a normal working state or not by judging and processing the characteristic parameters of the optical transceiver, so as to diagnose the optical transceiver.
The clock data recovery circuit is used for extracting the input signal to obtain a clock signal and determining the phase relation between the clock signal and the data signal. By connecting the first clock data recovery circuit 240 to the laser driver circuit 230, the first electrical signal can be extracted by the first clock data recovery circuit 240, the phase relationship between the clock signal and the data signal in the first electrical signal can be determined, the first electrical signal can be converted into the first optical signal by the laser driver circuit 230 and the FP laser 110, and the first optical signal can be output.
By connecting the second clock data recovery circuit 250 to the detector 120, after the detector 120 converts the second optical signal into the second electrical signal, the second electrical signal can be extracted by the second clock data recovery circuit 250, and the phase relationship between the clock signal and the data signal in the second electrical signal can be determined.
Further, the first clock data recovery circuit 240 and the second clock data recovery circuit 250 are used to connect to external electrical signal processing circuits, in one example, both the first clock data recovery circuit 240 and the second clock data recovery circuit 250 may be used to connect to a 25G (gigabit) electrical port.
In one embodiment, the circuit board may further include power management circuitry;
the power management circuit is respectively connected with the control circuit, the digital diagnosis monitoring circuit, the laser driving circuit, the first clock data recovery circuit and the second clock data recovery circuit.
Specifically, the power management circuit is used to provide operating voltages for the various devices in the optical transceiver.
In one embodiment, as shown in fig. 3, the circuit board further includes a transimpedance amplifier and a limiting amplifier;
the second clock data recovery circuit 250 is connected to the detector 120 sequentially through the limiting amplifier and the transimpedance amplifier.
In one embodiment, the optical transceiver further comprises a monitor photodiode connected to the circuit board.
In one embodiment, the FP laser 110 rate includes 25Gbps or more than 25 Gbps;
the first optical signal and the second optical signal have different wavelengths.
The FP laser 110 rate includes, but is not limited to, an operating rate, a transmission rate, and/or a modulation rate, among others.
Specifically, the operating rate of the FP laser 110 includes 25Gbps (gigabits per second), i.e., the operating rate of the FP laser 110 may be 25Gbps or more than 25 Gbps. In addition, the wavelengths of the first optical signal and the second optical signal are different, further, the wavelength of the first optical signal may be a specific wavelength, that is, the wavelength division multiplexing filter 130 may transmit the first optical signal, and the wavelength of the second optical signal may be other wavelengths, that is, the wavelength division multiplexing filter 130 may reflect the second optical signal, so as to ensure that the first optical signal may pass through the wavelength division multiplexing filter 130 along the transmission optical path and reach the optical fiber, and ensure that the second optical signal may be reflected to the detector 120 along the reception optical path.
In one embodiment, the first optical signal has a wavelength of 1310 nanometers and the second optical signal has a wavelength of 1550 nanometers;
or,
the first optical signal has a wavelength of 1550 nm and the second optical signal has a wavelength of 1310 nm.
Specifically, the wavelengths of the first optical signal and the second optical signal are different, further, the wavelength of the first optical signal may be 1310 nm, the wavelength of the second optical signal may be 1550 nm, that is, the wavelength of the downlink signal may be 1310 nm, and the wavelength of the uplink signal may be 1550 nm; or the wavelength of the first optical signal may be 1550 nm, and the wavelength of the second optical signal may be 1310 nm, that is, the wavelength of the downlink signal may be 1550 nm, and the wavelength of the uplink signal may be 1310 nm.
The wavelength interval of 240 nm is provided between the optical signal with the wavelength of 1310 nm and the optical signal with the wavelength of 1550 nm, when the wavelength interval is larger, the reflectivity of the wavelength division multiplexing filter 130 in the optical transceiver is larger, for example, the reflectivity of the wavelength division multiplexing filter 130 can be larger than 99.5%, when the optical signal reaches the wavelength division multiplexing filter 130 through the optical fiber and then is transmitted to the detector 120, the optical power loss can be reduced, so that the receiving sensitivity of the optical transceiver can be improved, and the overall performance of the optical transceiver can be improved while the cost of the optical transceiver is reduced.
In one embodiment, probe 120 is a PIN probe.
Specifically, by selecting a PIN (PN photodiode) detector, the cost of the optical transceiver can be reduced.
To facilitate understanding of the solution of the present application, a circuit board is described below by way of a specific example, and as shown in fig. 4, there is provided a circuit board in an optical transceiver, including a power supply circuit, a control circuit 210, a digital diagnostic monitoring circuit 220, a first clock data recovery circuit 240, a second clock data recovery circuit 250, a laser driving circuit 230, an FP laser 110, a monitor photodiode, a limiting amplifier, a transimpedance amplifier, and a PIN detector 120.
Specifically, the control circuit 210 is connected to the power supply circuit, the digital diagnosis monitoring circuit 220, the first clock data recovery circuit 240, the second clock data recovery circuit 250, the laser driving circuit 230, the FP laser 110, the monitoring photodiode, the limiting amplifier, the transimpedance amplifier, and the PIN detector 120, respectively;
the power supply circuit is respectively connected with the digital diagnosis monitoring circuit 220, the first clock data recovery circuit 240, the second clock data recovery circuit 250, the laser driving circuit 230, the FP laser 110, the monitoring photodiode, the limiting amplifier, the trans-impedance amplifier and the PIN detector 120;
the first clock data recovery circuit 240 is respectively connected with the 25G electric port and the laser driving circuit 230; the laser driving circuit 230 is respectively connected with the FP laser 110 and the monitoring photodiode; the monitor photodiode is connected to the FP laser 110.
The detector 120 is connected with the transimpedance amplifier; the trans-impedance amplifier is connected with the limiting amplifier; the limiting amplifier is connected to the second clock data recovery circuit 250.
In the optical transceiver, the control circuit 210 is connected to the digital diagnosis monitoring circuit 220, the laser driving circuit 230, the first clock data recovery circuit 240 and the second clock data recovery circuit 250, respectively, and the first clock data recovery circuit 240 is connected to the laser driving circuit 230; the laser driving circuit 230 is connected to the FP laser 110, and the second clock data recovery circuit 250 is connected to the detector 120, so that the phase relationship between the clock signal and the data signal can be determined, and the optical transceiver can be monitored and diagnosed, thereby improving the reliability of 5G communication.
In one embodiment, an optical transceiver module is provided, comprising a base 510, a fiber adapter 520, and the optical transceiver of any of the above embodiments;
the base 510 includes a chamber 530, a first opening disposed along a first optical axis, a second opening disposed along a second optical axis, and a third opening disposed along the first optical axis or the second optical axis; the first opening, the second opening and the third opening are all used for communicating the cavity 530 with the outside;
the FP laser 540 is disposed at the first opening; the probe 550 is disposed at the second opening; the fiber optic adapter 520 is disposed at the third opening; a wavelength division multiplexing filter 560 is disposed within the chamber 530 at the intersection of the first and second optical axes.
The first optical axis may be a horizontal optical axis of the optical transceiver module, and the second optical axis may be a vertical optical axis of the optical transceiver module.
Specifically, the base 510 includes a chamber 530, a first opening, a second opening, and a third opening. The first opening is arranged along the first optical axis, the second opening is arranged along the second optical axis, and the third opening is arranged along the first optical axis or the second optical axis. The third opening is arranged along the first optical axis, and the centers of the first opening and the third opening are aligned with each other; or the third opening is arranged along the second optical axis, and the centers of the second opening and the third opening are aligned with each other.
The cavity is communicated with the first opening, the second opening and the third opening. As shown in FIG. 5, FP laser 540 is positioned in the first opening, probe 550 is positioned in the second opening, and fiber optic adapter 520 is positioned in the third opening. Alternatively, the probe 550 is disposed in the first opening, the FP laser 540 is disposed in the second opening, and the fiber adapter 520 is disposed in the third opening; or the fiber optic adapter 520 is disposed in the first opening, the detector 550 is disposed in the second opening, and the FP laser 540 is disposed in the third opening; alternatively, as shown in FIG. 6, the fiber optic adapter 520 is disposed in the first opening, the FP laser 540 is disposed in the second opening, and the detector 550 is disposed in the third opening.
The wavelength division multiplexing filter 560 is disposed in the chamber 530 and located at the intersection of the first optical axis and the second optical axis, that is, the center of the wavelength division multiplexing filter 560 is located at the intersection of the first optical axis and the second optical axis.
In one embodiment, the wavelength division multiplexing filter 560 is fixed in the chamber 530 and forms a predetermined angle with the first optical axis.
Specifically, a wavelength division multiplexing filter 560 is secured within the chamber 530. In one example, a support body may be disposed in the chamber 530, and the support body has a slope with a predetermined angle, and the wavelength division multiplexing filter 560 is disposed on the slope, so that the wavelength division multiplexing filter 560 is fixed in the chamber 530 and forms an angle with the first optical axis. In another example, the wavelength division multiplexing filter 560 may be fixed in the chamber 530 by an adhesive and form an angle of a predetermined angle with the first optical axis.
Further, the angle of the included angle formed between the wavelength division multiplexing filter 560 and the first optical axis can be determined according to the arrangement positions of the FP laser 540, the detector 550 and the optical fiber. As shown in fig. 5, when the first opening and the third opening are disposed along the first optical axis and the second opening is disposed along the second optical axis, if the first optical axis is a directed line segment of the first opening pointing to the third opening, the wavelength division multiplexing filter 560 may form an included angle of 45 degrees with the first optical axis. As shown in fig. 6, when the first opening is disposed along the first optical axis and the second opening and the third opening are disposed along the second optical axis, if the first optical axis is a directed line segment of the first opening pointing to the third opening, the wavelength division multiplexing filter 560 may form an included angle of 135 degrees with the first optical axis.
In one embodiment, as shown in fig. 7, there is provided an optical communication system comprising an optical fiber, and a plurality of the optical transceivers of any of the above embodiments; the optical fibers are respectively connected with the optical transceivers.
The single fiber bidirectional optical signal transmission is realized, that is, the optical signals in two receiving and transmitting directions can be transmitted in one optical fiber at the same time, so that the optical fiber resource can be saved. The first optical signal transmitted by the same optical transceiver and the received second optical signal have different wavelengths.
In one embodiment, the number of optical transceivers is two;
the wavelength of a first optical signal emitted by any FP laser is 1310 nanometers; the wavelength of a first optical signal emitted by the other FP laser is 1550 nanometers;
the wavelength of the second optical signal received by any detector is 1550 nanometers; the wavelength of the first optical signal received by the other detector is 1310 nm.
Specifically, two optical transceivers, namely a first optical transceiver and a second optical transceiver, are included in the same optical communication system. The FP laser of the first optical transceiver may generate a first optical signal having a wavelength of 1310 nm, the detector may receive a second optical signal having a wavelength of 1550 nm, the FP laser of the second optical transceiver may generate a first optical signal having a wavelength of 1550 nm, and the detector may receive a second optical signal having a wavelength of 1310 nm.
Or the FP laser of the first optical transceiver may generate a first optical signal with a wavelength of 1550 nm, the detector may receive a second optical signal with a wavelength of 1310 nm, the FP laser of the second optical transceiver may generate a first optical signal with a wavelength of 1310 nm, and the detector may receive a second optical signal with a wavelength of 1550 nm.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. An optical transceiver, comprising an FP laser, a detector, a wavelength division multiplexing filter and a circuit board; the circuit board is respectively connected with the FP laser and the detector; the wavelength division multiplexing optical filter is arranged at the intersection of the transmitting light path of the FP laser and the receiving light path of the detector;
triggering the FP laser to generate a first optical signal by a first electric signal from the circuit board, wherein the first optical signal is output after penetrating through the wavelength division multiplexing optical filter along the emission light path;
the second optical signal is transmitted to the wavelength division multiplexing optical filter along the receiving optical path; the wavelength division multiplexing optical filter reflects the second optical signal to the detector; the detector converts the second optical signal into a second electrical signal and transmits the second electrical signal to the circuit board;
wherein the first electrical signal, the second electrical signal, the first optical signal and the second optical signal are all 5G signals.
2. The optical transceiver of claim 1, wherein the circuit board comprises a control circuit, a digital diagnostic monitoring circuit, a laser driver circuit, and a first clock data recovery circuit and a second clock data recovery circuit, each for connecting to an external electrical signal processing circuit;
the control circuit is respectively connected with the digital diagnosis monitoring circuit, the laser driving circuit, the first clock data recovery circuit and the second clock data recovery circuit;
the first clock data recovery circuit is connected with the laser driving circuit; the laser driving circuit is connected with the FP laser; the second clock data recovery circuit is connected with the detector.
3. The optical transceiver of claim 2, wherein the circuit board further comprises a transimpedance amplifier and a limiting amplifier;
the second clock data recovery circuit is connected with the detector through the limiting amplifier and the trans-impedance amplifier in sequence.
4. The optical transceiver of claim 1, further comprising a monitor photodiode coupled to the circuit board.
5. The optical transceiver of claim 2, wherein the circuit board further comprises a power management circuit;
the power management circuit is respectively connected with the control circuit, the digital diagnosis monitoring circuit, the laser driving circuit, the first clock data recovery circuit and the second clock data recovery circuit.
6. The optical transceiver of any of claims 1 to 5, wherein the FP laser has a rate that includes 25Gbps or more;
the first optical signal and the second optical signal have different wavelengths.
7. The optical transceiver of claim 6, wherein the first optical signal has a wavelength of 1310 nm and the second optical signal has a wavelength of 1550 nm;
or,
the first optical signal has a wavelength of 1550 nm and the second optical signal has a wavelength of 1310 nm.
8. The optical transceiver of any one of claims 1 to 5, wherein the probe is a PIN probe.
9. An optical transceiver module comprising a base, a fiber adapter and the optical transceiver of any of claims 1-8;
the base comprises a chamber, a first opening arranged along a first optical axis, a second opening arranged along a second optical axis, and a third opening arranged along the first optical axis or the second optical axis; the first opening, the second opening and the third opening are all used for communicating the chamber with the outside;
the FP laser is arranged at the first opening; the detector is arranged at the second opening; the fiber optic adapter is disposed at the third opening; the wavelength division multiplexing optical filter is arranged in the cavity and is positioned at the intersection of the first optical axis and the second optical axis.
10. The optical transceiver module of claim 9, wherein the wavelength division multiplexing filter is fixed in the cavity and forms a predetermined angle with the first optical axis.
11. An optical communication system comprising an optical fiber, and a plurality of optical transceivers according to any one of claims 1 to 8; the optical fibers are respectively connected with the optical transceivers.
12. The optical communication system of claim 11, wherein the number of the optical transceivers is two;
the wavelength of the first optical signal emitted by any FP laser is 1310 nanometers; the wavelength of the first optical signal emitted by the other FP laser is 1550 nanometers;
the wavelength of the second optical signal received by any one of the detectors is 1550 nanometers; the wavelength of the first optical signal received by the other detector is 1310 nanometers.
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