CN109061814B - Single-fiber bidirectional transceiver based on circulator - Google Patents

Single-fiber bidirectional transceiver based on circulator Download PDF

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Publication number
CN109061814B
CN109061814B CN201811020457.3A CN201811020457A CN109061814B CN 109061814 B CN109061814 B CN 109061814B CN 201811020457 A CN201811020457 A CN 201811020457A CN 109061814 B CN109061814 B CN 109061814B
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circulator
optical
transmitter
receiver
light
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CN109061814A (en
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邓磊
徐红春
肖清明
刘成刚
宋旭宇
李建
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Wuhan Telecommunication Devices Co Ltd
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Wuhan Telecommunication Devices Co Ltd
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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
    • G02B6/4287—Optical modules with tapping or launching means through the surface of the waveguide
    • 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
    • G02B6/4213—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being polarisation selective optical elements
    • 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
    • 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
    • H04B10/2589—Bidirectional transmission
    • 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)
  • Semiconductor Lasers (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

The invention relates to the technical field of optical communication, in particular to a circulator-based single-fiber bidirectional transceiver, which comprises a packaging tube body, a transmitter, a receiver, an optical interface and an optical circulator, wherein the transmitter and the receiver are packaged in the packaging tube body; the TEC is arranged in the emitter and used for adjusting the working temperature of the laser in the emitter so as to adjust the central wavelength of the outgoing light. The circulator is used as a light splitting element to connect the transmitting end, the receiving end and the optical interface, so that the device is simple in process, low in requirement on position precision and easy to produce in batches; meanwhile, the working temperature of the laser is adjusted through the TEC, so that the accurate control of the light emitting wavelength of the emitter is realized, a single device is used for realizing a multi-wave function, and the replaceability of the device is improved.

Description

Single-fiber bidirectional transceiver based on circulator
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of optical communication, in particular to a single-fiber bidirectional transceiver based on a circulator.
[ background of the invention ]
A single-fiber Bidirectional component (BOSA, abbreviated as Bidirectional Optical Subassembly) is a photoelectric conversion device integrating transmission and reception, and adopts a single Optical fiber to realize a data Bidirectional transmission function, and is a core device of modern Optical communication.
A common single-fiber bidirectional component is generally in a TO-CAN package form as shown in fig. 1, and is composed of a single-channel transmitter 01, a single-channel receiver 02, an optical filter 03, an optical interface 04 with an integrated pin, and a round and square tube 05. However, when the optical filter is used as a light splitting element, the requirement on position accuracy is high, the processing technology is complex, and batch production is not easy to realize; due TO the influence of the high-frequency performance of the TO-CAN base, the single-channel transmission rate of the packaged device is difficult TO be higher than 25 Gbps. In addition, as the TO-CAN packaging type TEC is not matched temporarily on the market at present, the TO-CAN packaging emitter is not provided with a built-in TEC, the central wavelength of emitted light CAN drift due TO temperature instability, crosstalk is generated among different channels, and the wavelength of the emitter is difficult TO be accurately controlled. In order to avoid the drift of the central wavelength of emitted light caused by temperature runaway, only a CWDM chip scheme is often adopted, and the design can not meet the requirements of a 5G transmission network on device performance and transmission distance. Meanwhile, because the wavelength of the transmitter is fixed, the devices must be used in a matched mode, the devices do not have good replaceability, the networking cost is increased, and the communication capacity of optical fiber wavelength division multiplexing is reduced.
In view of the above, it is an urgent problem in the art to overcome the above-mentioned drawbacks of the prior art.
[ summary of the invention ]
The technical problems to be solved by the invention are as follows:
the optical filter is used as a light splitting element in a single-fiber bidirectional component which is commonly used at present, the requirement on position precision is high, the process is complex, batch production is not easy TO realize, a TO-CAN packaged emitter does not have a built-in TEC, the central wavelength of emitted light CAN drift due TO temperature instability, and the wavelength of the emitter is difficult TO control.
The invention achieves the above purpose by the following technical scheme:
the invention provides a circulator-based single-fiber bidirectional transceiver, which comprises a packaging tube body 1, a transmitter 2, a receiver 3, an optical interface 4 and an optical circulator 5, wherein the transmitter 2 and the receiver 3 are packaged in the packaging tube body 1, the optical circulator 5 is fixed with the packaging tube body 1, and the optical circulator 5 is used for connecting the transmitter 2, the receiver 3 and the optical interface 4, so that an optical signal of the transmitter 2 is coupled into the optical interface 4 after passing through the optical circulator 5, and an optical signal of the optical interface 4 is coupled into the receiver 3 after passing through the optical circulator 5; the TEC 6 is arranged in the emitter 2 and used for adjusting the working temperature of the laser and further adjusting the light-emitting center wavelength of the emitting end.
Preferably, the optical circulator 5 includes a first polarization beam splitter 51, a faraday rotator 52, a half-wave plate 53 and a second polarization beam splitter 54 connected in sequence; the first polarization beam splitter 51 is configured to perform polarization beam splitting on an optical signal generated by the transmitting end, and the second polarization beam splitter 54 is configured to perform polarization beam splitting on an optical signal entering from the optical interface 4.
Preferably, a film system structure is laid on the surface of the first polarization beam splitter 51, so that the transmittance of the first polarization beam splitter 51 for short wave is lower than that for long wave in the wavelength range of the outgoing light from the emission end; wherein, in the short-wave range, the transmittance increases with increasing wavelength; in the long wavelength range, the transmittance is higher than 50%.
Preferably, the film structure is made of Ti with high refractive index2O5With low refractive index SiO2Forming a cross plating layer; the number of the laying layers of the two materials in the film system structure and the laying thickness of each layer are obtained through simulation calculation.
Preferably, the optical circulator 5 is fixed on the package tube 1 by means of gluing or laser welding.
Preferably, the transmitter 2 and the receiver 3 are packaged inside the package body 1 in the form of a BOX package or a TO package.
Preferably, the transmitter 2 and the receiver 3 use optoelectronic chips satisfying a linear modulation scheme to support a PAM4 modulation scheme.
Preferably, the transmitter 2 uses a laser chip in the form of a DML or EML modulation.
Preferably, the transmitter 2 uses a LAN-WDM, CWDM or DWDM laser chip.
Preferably, the optical interface 4 is in the form of a pigtail or an integral pin.
The invention has the beneficial effects that:
the single-fiber bidirectional transceiver based on the circulator provided by the invention uses the circulator as a light splitting element to connect the transmitting end, the receiving end and the optical interface, has simple bonding of devices and low requirement on position precision, is easy for batch production, and can realize the transmission and the reception of optical signals with the same central wavelength or different central wavelengths; meanwhile, the transmitting end can be provided with a TEC (thermoelectric cooler) to adjust the working temperature of the laser, so that the wavelength of light emitted by the transmitting end can be accurately controlled, a single device is used for realizing a multi-wave function, and the replaceability of the device is improved; the transmittance design is carried out on the polarization beam splitter of the optical circulator, so that the phenomena of overlarge emergent light and eye pattern cracking of the laser at low temperature are improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a conventional single-fiber bidirectional transceiver device using an optical filter as a light splitting element;
fig. 2 is a schematic structural diagram of a circulator-based single-fiber bidirectional transceiver according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an optical circulator provided by an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an optical circulator provided in an embodiment of the present invention;
FIG. 5 is a diagram of a transmission spectrum of a first polarization beam splitter in an optical circulator according to an embodiment of the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention 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 invention and are not intended to limit the invention.
In the description of the present invention, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The invention will be described in detail below with reference to the figures and examples.
The embodiment of the invention provides a circulator-based single-fiber bidirectional transceiver, which comprises a packaging tube body 1, a transmitter 2, a receiver 3, an optical interface 4 and an optical circulator 5, wherein the transmitter 2 and the receiver 3 are packaged in the packaging tube body 1, the optical circulator 5 is fixed with the packaging tube body 1, and the optical interface 4 is arranged on the packaging tube body 1 and is connected with an external optical fiber; the transmitter 2 shares the optical interface 4 with the receiver 3. The optical circulator 5 is used for connecting the transmitter 2, the receiver 3 and the optical interface 4, so that an outgoing optical signal of the transmitter 2 is coupled into the optical interface 4 after passing through the optical circulator 5, and an incoming optical signal of the optical interface 4 is coupled into the receiver 3 after passing through the optical circulator 5. In the embodiment of the invention, the TEC 6 is designed and installed in the emitter 2, the working temperature of the laser is adjusted through the TEC 6, and the light-emitting central wavelength of the laser at the emitting end is adjusted.
Compared with the traditional optical filter scheme, the optical circulator 5 is used as a light splitting element, the connection process is simple, the requirement on position precision is low, batch production is easy, and the transmission and the reception of optical signals with the same central wavelength or different central wavelengths can be realized. The transmitter 2 and the receiver 3 share the optical interface 4, so that the number of optical fibers in an optical transceiving system is greatly reduced, the system structure is simplified, and the method is particularly suitable for application scenes of limited optical fiber resources and LAN-WDM and DWDM dense wavelength division multiplexing technologies. By arranging the TEC, the light-emitting center wavelength of the emitter can be accurately adjusted, a multi-wave function can be realized by using a single device, and the replaceability of the device is improved. Meanwhile, the size of the device meets the standard packaging requirements of a small high-speed optical module QSFP28 or CSFP and the like popular in the industry, and high-bandwidth and low-cost transmission can be realized.
The following describes the structure of each part of the single-fiber bidirectional transceiver according to this embodiment in detail with reference to the accompanying drawings. The packaging tube body 1 is a commonly used round and square tube body; the transmitter 2 and the receiver 3 may be in the form of a BOX package or a TO package, and are packaged inside the package body 1, and the TO package is taken as an example in fig. 2; the optical interface 4 may be in the form of a pigtail or an integrated pin, which is illustrated in fig. 2 as an example.
With continued reference to fig. 2, the optical circulator 5 is located between the transmitter 2 and the optical interface 4, and the receiver 3 is located on the upper side of the optical circulator 5. The single-fiber bidirectional transceiver further comprises a circulator base 7, and the optical circulator 5 is fixed with the packaging pipe body 1 after being bonded on the circulator base 7 in the installation and manufacturing process, specifically can be fixed in a gluing or laser welding mode and by mechanical matching. The single-fiber bidirectional transceiver further comprises a collimating lens 8, a first converging lens 9 and a second converging lens 10, for the transmitting end, the laser in the transmitter 2 generates an optical signal, the optical signal is divergent light, the divergent light passes through the collimating lens 8 and is adjusted into collimated light, passes through the optical circulator 5 and then reaches the first converging lens 9, the collimated light is adjusted into convergent light, and the convergent light is finally coupled into the optical interface 4 for output and received by an optical fiber at the output end; for the receiving end, an optical signal is input through the optical interface 4 by an optical fiber, is converted into collimated light through the first converging lens 9, and reaches the second converging lens 10 after passing through the optical circulator 5, so that the optical signal is converged and coupled into the receiver 3.
The emitter 2 can specifically adopt a laser in a DML or EML modulation mode, wherein the DML is a direct modulation laser, and the EML is an electric absorption modulation laser; meanwhile, the transmitter 2 and the receiver 3 can also use photoelectric chips meeting the linear modulation mode to support the PAM4 modulation mode, and the transmission rate of 25G or 10G photoelectric devices can be doubled by combining the PAM4 technology, so that the transmission of high-speed optical signals is realized, and the optical fiber communication capacity is improved. In the embodiment of the present invention, the optical signals at the transmitting end and the receiving end may be two wavelength signals with a predetermined wavelength interval, or may be signals with the same wavelength. The wavelength interval can be adjusted according to application requirements, and when the wavelength interval is zero, the single-fiber bidirectional transceiver is a single-wavelength single-fiber bidirectional transceiver. Then, from the perspective of wavelength density, the transmitter 2 may specifically employ a LAN-WDM laser chip, a CWDM laser chip, or a DWDM laser chip, where the wavelength interval corresponding to the LAN-WDM laser is 5nm, the wavelength interval corresponding to the CWDM laser chip may reach 20nm, and the wavelength interval corresponding to the DWDM laser chip is 0.4nm, 0.8nm, or 1.6 nm.
Referring to fig. 3 and 4, the optical circulator 5 includes a first polarization beam splitter 51, a faraday rotator 52, a half-wave plate 53, and a second polarization beam splitter 54 sequentially connected from left to right, where TX denotes a transmitter, RX denotes a receiver, and COM denotes an optical interface. For the transmitting end, when light is transmitted from TX through the optical circulator 5, the first polarization beam splitter 51 performs polarization beam splitting on the optical signal from the transmitting end, and splits the optical signal into two beams of polarized light in parallel direction (P light) and polarized light in vertical direction (S light); the P light is reflected and the S light is transmitted, and then enters the faraday rotator 52 and the half-wave plate 53, the polarization state changes, the P light becomes the S light, and the S light becomes the P light. At the second polarization beam splitter 54, the P light and the S light are output by COM after being combined; if the optical signal transmitted by the TX is linearly polarized light and the polarization direction is consistent with the P light or the S light of the polarization beam splitter prism, only one optical path route is taken. For the receiving end, an optical signal enters from the COM end, the second polarization beam splitter 54 performs polarization beam splitting on the optical signal entering from the COM end to split the optical signal into P light and S light, the P light enters the half-wave plate 53 and the faraday rotator 52 after being reflected and transmitted, the polarization state does not change, and the P light and the S light enter the RX port after being combined at the first polarization beam splitter 51.
As shown in fig. 4, the faraday rotator 52 is disposed in a magnetic block 55, the polarization direction of the faraday rotator 52 is rotated by 45 degrees, and the polarization rotation direction is determined by the magnetic field direction of the magnetic block 55. In order to prevent the optical signal emitted by the laser from being reflected back to the emitting end and causing damage to the laser, the first polarization splitting plate 51 may be deflected at a certain angle with respect to the optical path direction of the emitted optical signal, as shown in fig. 4. The angle is usually designed to be 4 ° or 8 °, so as to improve the protection effect on the laser at the emitting end against return loss.
In a specific embodiment, taking a single-fiber bidirectional BOSA device based on a PAM4 modulation method and having a transmission rate of 50Gbps as an example, the transmitter 2 is in a ceramic tube-shell airtight packaging form, a chip is a single-channel 25G EML chip, the operating current of the chip is generally 30mA-100mA, and the central wavelength is 1552.5 nm. Because the threshold current of the laser is gradually increased along with the increase of the temperature of the chip, the threshold current of the laser is only about 10mA under the normal-temperature working condition; while at an operating temperature of 50 c the threshold current of the laser is increased to around 25 mA. The working waveband of the chip is in C waveband, the application environment is 50GHz, and the wavelength interval of the transmitting and receiving light is 0.4 nm. The receiver 3 adopts a TO-CAN packaging form, the chip is a single-channel 25G PIN chip, the response wavelength is 1200nm-1600nm, the matched transimpedance amplifier is a linear amplifier chip and supports a PAM4 modulation format.
In general, the typical operating temperature of a laser is 50 ℃, and the center wavelength of the output light wave is 1552.5 nm. In order to realize the wavelength adjustability of the laser chip at the transmitting end, the TEC 6 is used for adjusting the working temperature of the laser chip in the transmitter 2, and the temperature is controlled to be 20-65 ℃. In this embodiment, when the operating temperature is set to 50 ℃, the wavelength of light emitted from the laser chip is 1552.5nm, the bias current is about 50mA, and the relationship between the wavelength of the center of light emitted from the laser chip and the temperature is λ ═ λ0+0.08(T-50), where λ0The chip was operated at a center wavelength of 50 c. Therefore, the TEC 6 is used for adjusting the working temperature of the laser to 20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃ and 65 ℃ respectively, so that the optical signal with the central wavelength of 1550.1nm-1553.7nm and the wavelength interval of 0.45nm can be obtained. Therefore, the accurate control of the light-emitting wavelength of the emitter 2 is realized, the multi-wave function can be realized by using a single device, and the replaceability of the device is improved.
When the working temperature of the laser is continuously increased, the emergent light power is gradually reduced under the same bias current. For this reason, when the operating temperature of the laser is adjusted, it is necessary to continuously adjust the bias current of the laser at the same time. In general, the emergent power is reduced by 1dBm to 1.5dBm when the working temperature is increased by 5 ℃, which means that the current needs to be adjusted up to 5mA to 10 mA. The optimal working current of the laser is generally 30mA-100mA, and the current is lower than 30mA, and the emergent eye pattern is seriously cracked; if the current is too high, the eye pattern is not good and the protocol requirements cannot be met because the emergent light power is too high. When the working temperature of the laser chip is 40-65 ℃, the bias current of the laser can be adjusted between 30mA-80mA, and the light intensity meeting the protocol requirement is further obtained. When the working temperature is 20-40 ℃, if the bias current is not reduced, the receiving end eye diagram is poor due to overlarge light emitting power; if the bias current is reduced, the operating current will be less than 30mA and the exit eye pattern will crack. Therefore, when the working temperature is 40-65 ℃, the emergent light power can be adjusted by adjusting the current; when the working temperature is 20-40 ℃, the required light output power is difficult to obtain by adjusting the current.
In this embodiment, in order to solve the problems of excessive laser output power and eye pattern cracking at the receiving end at low temperature (20-40 ℃), a film system structure is laid on the surface of the first polarization beam splitter 51, so that the first polarization beam splitter 51 is designed to have a low short-wave transmittance and a high long-wave transmittance in the wavelength range of the output light at the transmitting end; wherein, in the short-wave range, the transmittance increases with increasing wavelength; in the long wavelength range, the transmittance is higher than 50%. The method specifically comprises the following steps: the light emitting power meeting the requirements is difficult to obtain by adjusting the current in a low temperature range (20-40 ℃), the light emitting wavelength in the low temperature range is shorter and is classified as short wave, the light signal transmittance in the short wave range needs to be designed to be lower, and the shorter the wavelength is, the lower the transmittance is; the light emitting wavelength in the high temperature range (40-65 ℃) is longer, the light emitting wavelength is classified into long wave, the light signal transmittance in the long wave range needs to be designed to be higher, and the transmission curve is shown in figure 5, so that the problem of overlarge light emitting power at low temperature is solved. Wherein, the abscissa in fig. 5 represents the wavelength range, and the ordinate represents the transmittance at the corresponding wavelength, as can be seen from fig. 5, the transmittance of the corresponding 1550.1nm optical signal at 20 ℃ is not more than 50%, and the light output power of the adjustable laser is about 0dbm at this time; from 20 ℃ to 40 ℃, the light-emitting wavelength is gradually increased from 1550.1nm to 1552.5nm, and the corresponding light signal transmittance is gradually increased; the corresponding 1553.7nm optical filter has a transmittance of 99% at 65 ℃ and an optical power of about 0 dbm.
To achieve the above transmission effect, the film system structure is laid on the surface of the first polarization beam splitter 51, and the film system structure is made of Ti with high refractive index2O5With low refractive index SiO2And forming a crossed coating. Wherein, the material with high refractive index Ti2O5Refractive index n ofH2.06, low refractive index material SiO2Refractive index n ofL1.45. In this embodiment, according to the transmission curve shown in fig. 5, through computer simulation and calculation, the film system structure meeting the transmission curve in fig. 5 is designed to be a/(HL)6H2LH (LH)6l (HL)7H2LH (LH)7l (HL)7H2LH (LH)7l (HL)6H2LH (LH) 6/G. Wherein, the laying layer number and each laying thickness of the two materials in the film system structure are obtained by simulation calculation, in the embodiment, Ti2O5And SiO2There were 88 layers laid co-crosswise, and the thickness of each layer was determined by computer simulation design. The channel loss of the light-emitting optical filter obtained by the method is less than 0.3dbm, the channel width is 3nm, the central wavelength is 1552.5nm, and the central wavelength insertion loss is-0.11 db; meets the requirement index of the 50GHz optical filter.
The wavelength value, the temperature value and the specific transmittance value used in the embodiment of the present invention are examples for convenience of description, and are not intended to limit the present invention.
In summary, compared with the conventional single-fiber bidirectional device, the circulator-based single-fiber bidirectional transceiver provided by the embodiment of the invention has the following advantages: compared with the conventional optical filter scheme, the circulator is used as a light splitting element, the device is simple to bond, the requirement on position precision is low, the coupling tolerance is large, and batch production is easy; the emitter and the receiver share one optical interface, and the emitter, the receiver and the optical interface are connected through the optical circulator, so that the emission and the reception of optical signals with the same central wavelength or different central wavelengths can be realized, the process is simpler, and the system structure is simplified; the working temperature of the laser is adjusted through the TEC, and the light-emitting center wavelength of the laser is adjusted, so that the light-emitting center wavelength of the emitter can be accurately adjusted, a single device is used for realizing a multi-wave function, and the replaceability of the device is improved; the polarization beam splitter on the optical circulator near one end of the emitter is designed to have low short wave direction transmittance and high long wave direction transmittance, so that the phenomena of overlarge emergent light and eye pattern cracking of the laser at low temperature are improved; the transmitter and the receiver can use photoelectric chips satisfying a linear modulation mode and support a PAM4 modulation mode.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. A circulator-based single-fiber bidirectional transceiver is characterized by comprising a packaging tube body (1), a transmitter (2), a receiver (3), an optical interface (4) and an optical circulator (5), wherein the transmitter (2) and the receiver (3) are packaged in the packaging tube body (1), the optical circulator (5) is fixed with the packaging tube body (1), the optical circulator (5) is used for connecting the transmitter (2), the receiver (3) and the optical interface (4), so that an outgoing light signal of the transmitter (2) is coupled into the optical interface (4) after passing through the optical circulator (5), and an incoming light signal of the optical interface (4) is coupled into the receiver (3) after passing through the optical circulator (5); the TEC (6) is arranged in the emitter (2) and used for adjusting the working temperature of the laser and further adjusting the light-emitting center wavelength of the emitting end;
the optical circulator (5) comprises a first polarization beam splitter (51), a Faraday rotator (52), a half-wave plate (53) and a second polarization beam splitter (54) which are sequentially connected; wherein, the surface of the first polarization beam splitter (51) is paved with a film system structure which is composed of Ti2O5And SiO2The cross-plating layer is formed such that the first polarization splitting sheet (51) has a transmittance for short wavelengths lower than that for long wavelengths in the wavelength range of outgoing light from the emission end, and the transmittance increases with increasing wavelength in the short wavelength range.
2. Circulator-based bidirectional fiber transceiver according to claim 1, characterized in that the optical circulator (5) is fixed to the package body (1) by means of gluing or laser welding.
3. Circulator-based bi-directional transceiver according TO claim 1, characterized in that the transmitter (2) and the receiver (3) are in the form of a BOX package or TO package, packaged inside the package body (1).
4. The circulator-based single-fiber bidirectional transceiver of claim 1, wherein the transmitter (2) and the receiver (3) use optoelectronic chips satisfying a linear modulation scheme to support a PAM4 modulation scheme.
5. The circulator-based single-fiber bidirectional transceiver of claim 1, wherein the transmitter (2) uses a laser chip in DML or EML modulation.
6. The circulator-based single-fiber bidirectional transceiver of claim 1, wherein the transmitter (2) uses a LAN-WDM, CWDM, or DWDM laser chip.
7. Circulator-based bi-directional transceiver according to claim 1, characterized in that the optical interface (4) takes the form of a pigtail or an integral pin.
CN201811020457.3A 2018-09-03 2018-09-03 Single-fiber bidirectional transceiver based on circulator Active CN109061814B (en)

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