WO2015184593A1

WO2015184593A1 - Transmitter and optical signal transmission method

Info

Publication number: WO2015184593A1
Application number: PCT/CN2014/079125
Authority: WO
Inventors: 廖振兴; 徐成植; 程宁; 卫国; 周敏
Original assignee: 华为技术有限公司
Priority date: 2014-06-04
Filing date: 2014-06-04
Publication date: 2015-12-10
Also published as: CN105409143B; CN105409143A

Abstract

A transmitter and optical signal transmission method; the transmitter (200) comprises first lasers (210), N first FP lasers (220), N first optical signal detection units (230) and N first adjustment units (240); the first laser (210) is used to transmit a first optical signal; each of the first FP lasers (220) is used to receive the first optical signal, and transmit a first excitation optical signal according to the first optical signal; each of the first optical signal detection units (230) is used to detect the first excitation optical signal transmitted by the corresponding first FP laser (220), and determines whether the corresponding first FP laser (220) works in an injection locked state optimized area; each of the first adjustment units (240) is used to adjust the current working parameter of the corresponding first FP laser (220) when the corresponding first FP laser (220) is not working in an injection locked state optimized area. The transmitter can transmit an optical signal having small dispersion cost.

Description

Transmitter and method for transmitting optical signals

Embodiments of the present invention relate to the field of communications and, more particularly, to a transmitter and a method for transmitting an optical signal. Background technique

Passive Optical Network (PON) is a strong competitor for the next generation of broadband access networks. At present, with the rapid development of various broadband services, such as video conferencing, 3D TV, mobile backhaul, interactive games, etc., the demand for access bandwidth is increasing, which leads to the continuous transmission rate of the PON system. improve. However, for a high transmission rate PON system, even a transmission distance of 20 km will cause a significant dispersion cost, resulting in deterioration of the transmission signal quality and a decrease in system reception sensitivity.

The dispersion cost transmitted in the PON system is closely related to the modulation mode of the transmitting end. The frequency of the optical signal caused by different modulation modes is different, which will directly lead to different dispersion costs. At present, the PON system mainly takes two modulation modes: external modulation and direct modulation. External modulation refers to directly injecting the output light of the laser into an external modulator. For example, an Electro-absorption Modulated Laser (EML), the modulation signal controls the external modulator, and the acousto-optic and electro-optical effects of the modulator are used to make it The parameters such as the intensity of the output light vary with the modulation signal. At this time, since the laser operates in a static DC state, the frequency of the output signal is small and the transmission performance is high. Direct modulation refers to modulating the output signal of a semiconductor laser by changing the injection current, for example, a Directly Modulated Laser (DML), which is simple in structure, easy to implement, and low in cost. However, the modulation current causes a change in the refractive index of the active layer of the semiconductor, causing the phase of the light to be modulated, thereby widening the operating frequency, that is, there is a large frequency 啁啾, and as the modulation rate is increased, the apology becomes more serious. .

Currently, the optical module uses the EML on the optical line terminal (OLT) side of the 10-Gigabit-capable Passive Optical Network (XG-PON). For optical modules with modulation rates of 10G and above, EML clearly solves the problem of signal distortion caused by dispersion, but EML is expensive and introduces large insertion loss (about 6 ~ 8dB), which also leads to Module power consumption is high; and EML module power consumption is too high, which further causes the port density of OLT to be difficult to increase, and indirectly increases the design. Backup cost. Compared with EML, DML has obvious advantages in cost, insertion loss and power consumption, but traditional DML cannot be directly used as a transmitter of optical modules in high-speed OLT, and dispersion must be eliminated by certain dispersion suppression or dispersion compensation techniques. The resulting transmission dispersion penalty.

In summary, how to find an optical transmitter with low cost, low power consumption, high port density and high transmission rate is an urgent problem to be solved in the current high-rate PON system. Summary of the invention

Embodiments of the present invention provide a transmitter and a method for transmitting an optical signal capable of emitting an optical signal having a smaller dispersion cost.

In a first aspect, an embodiment of the present invention provides a transmitter, including: a first laser, N first Fabry-Perot FP lasers, N first optical signal detecting units, and N first adjusting units, The N first optical signal detecting units are in one-to-one correspondence with the N first adjusting units and the N first FP lasers, and N is an integer greater than or equal to 1, wherein the first laser is used to emit a single wavelength a first optical signal; each of the first FP lasers for receiving the first optical signal from the first laser, and transmitting a first excitation optical signal according to the received first optical signal; each of the first The optical signal detecting unit is configured to detect a first excitation light signal emitted by the first FP laser corresponding to the first optical signal detecting unit, and detect the first excitation light signal according to the corresponding first FP laser As a result, determining whether the corresponding first FP laser operates in an injection locking state optimization interval; each of the first adjustment units is configured to: if the first light corresponding to the first adjustment unit The detecting unit detects that the first FP laser corresponding to the first adjusting unit is not operating in the injection locking state optimization interval, and adjusts a current operating parameter of the corresponding first FP laser such that the corresponding first FP The laser operates in the injection lock state optimization interval.

In a first possible implementation manner, the first optical signal detecting unit includes: an optical band pass filter, configured to filter the received first excitation optical signal to obtain a first excitation in a preset passband The optical signal is used to perform photoelectric detection on the first excitation light signal filtered by the optical band pass filter.

In combination with the foregoing possible implementation manner, in a second possible implementation, the N first FP lasers are specifically multiple first FP lasers, and the transmitter further includes: a first optical power splitter, configured to The first optical signal emitted by the first laser is divided into N first optical signals; each of the first FP lasers is specifically configured to receive a first optical signal of the N first optical signals.

In combination with the above possible implementation manners, in a third possible implementation manner, the transmitter is further included The method includes: at least one second optical power splitter and at least one second FP laser, wherein each of the second optical power splitters is configured to output a first FP laser of the N first FP lasers An excitation light signal is divided into a plurality of first excitation light signals; each of the second FP lasers is configured to receive a first excitation light signal of the plurality of first laser signals, and according to the received first excitation The optical signal emits a second excitation light signal.

In conjunction with the foregoing possible implementation manners, in a fourth possible implementation, the first excitation optical signal received by each of the second optical power splitters is an unmodulated direct current optical signal.

In combination with the foregoing possible implementation manner, in a fifth possible implementation, the transmitter further includes: at least one second optical signal detecting unit and at least one second adjusting unit, the at least one second optical signal detecting unit and the The at least one second adjusting unit and the at least one second FP laser are in one-to-one correspondence, wherein

Each of the second optical signal detecting units is configured to detect a second excitation light signal emitted by the second FP laser corresponding to the second optical signal detecting unit, and determine, according to the detection result, whether the corresponding second FP laser is Working in the injection locking state optimization interval; each of the second adjusting units is configured to adjust the corresponding second FP laser if the second FP laser corresponding to the second adjusting unit does not operate in the injection locking state optimization interval The current operating parameters are such that the corresponding second FP laser is in the injection lock optimization interval.

In combination with the foregoing possible implementation manners, in the sixth possible implementation, each of the first optical signal detecting units is specifically configured to detect at least one of the following parameters of the first excitation optical signal: the optical power and the extinction ratio; Each of the first optical signal detecting units is further configured to: when detecting that the first excitation light signal meets at least one of the following conditions, determining that the corresponding first FP laser is not operating at the annotation threshold and the extinction ratio The absolute value of the difference of the preset extinction ratio is greater than the second preset threshold.

In conjunction with the above possible implementations, in a seventh possible implementation, the current operational parameter includes at least one of the following parameters: operating temperature and bias current.

In combination with the above possible implementation manners, in an eighth possible implementation manner, the first laser is a distributed feedback laser.

In a second aspect, a method for emitting an optical signal is provided, comprising: generating a first optical signal having a single wavelength; and each of the N first Fabry-Perot FP lasers based on the first optical signal The first FP laser generates a first excitation light signal, N is an integer greater than or equal to 1; detecting a first excitation light signal generated by the N first FP lasers, and according to the pair of the first excitations The detection result of the optical signal determines whether the N first FP lasers are operating in the injection locking state optimization interval; if the first FP laser is not operating in the injection locking state optimization interval, adjusting the first operation of the injection locking state optimization interval The current operating parameters of an FP laser are such that the first FP laser that is not operating in the injection locking state optimization interval operates in the injection locking state optimization interval.

In a first possible implementation manner, the detecting the first excitation light signal generated by the N first FP lasers includes: filtering, for each of the N first excitation light signals, Obtaining N first excitation light signals in a preset passband; and performing photodetection on the N first excitation light signals in the preset passband.

In combination with the foregoing possible implementation manner, in a second possible implementation, the generating, by the first FP laser, the first excitation light signal according to the first optical signal, the method includes: The first optical signal is divided into a plurality of first optical signals; each first FP laser generates a first excitation optical signal according to one of the plurality of first optical signals.

In combination with the foregoing possible implementation manner, in a third possible implementation manner, the method further includes: splitting part or all of the first excitation light signals of the N first excitation light signals to obtain a multipath An excitation light signal; each of the at least one second FP laser generates a second excitation light signal according to a first excitation light signal of the plurality of first excitation light signals; Detecting at least one second excitation light signal generated by the FP laser, and determining, according to the detection result of the at least one second excitation light signal, whether the at least one second FP laser operates in an injection locking state optimization interval; The FP laser does not operate in the injection locking state optimization interval, and adjusts the current operating parameter of the second FP laser that is not operating in the injection locking state optimization interval, so that the second FP laser that is not operating in the injection locking state optimization interval operates in the injection Lock state optimization interval.

In combination with the foregoing possible implementation manner, in a fourth possible implementation, the split first excitation optical signal is a direct current unmodulated optical signal; and each second FP laser of the at least one second FP laser Generating a second excitation light signal according to a first excitation light signal of the plurality of first excitation light signals, comprising: generating, by each of the second FP lasers, a second excitation light signal according to the DC unmodulated optical signal .

In combination with the foregoing possible implementation manners, in the fifth possible implementation, the detecting the first excitation light signal generated by the N first FP lasers includes: detecting the following parameters of the N first excitation light signals At least one of: the optical power and the extinction ratio; according to the N first excitation lights The detection result of the signal determines whether the N first FP lasers are operating in the injection locking state optimization interval, and the method includes: if the first excitation light signal satisfies at least one of the following preset conditions, determining that the generation meets the preset condition The first FP laser of the first excitation light signal is not operating in the injection locking state optimization interval: the absolute value of the difference between the output power and the preset output power is greater than the difference between the first preset threshold and the extinction ratio and the preset extinction ratio The absolute value of the value is greater than the second predetermined threshold.

In conjunction with the above possible implementations, in a sixth possible implementation, the current operational parameter includes at least one of the following parameters: operating temperature and bias current.

The transmitter and the method for transmitting an optical signal according to the foregoing technical solution, the first optical signal having a single wavelength is transmitted by the first laser and the first optical signal is transmitted to the first FP laser, if The wavelength of the first optical signal is near a longitudinal mode peak of the first FP laser, and the first FP laser enters an injection locking state and emits an excitation light signal having the same wavelength as the first optical signal; further, the light The signal detecting unit detects the excitation light signal emitted by the first FP laser to determine whether the first FP laser operates in an injection locking state optimization interval, if the optical signal detecting unit detects that the first FP laser is not working in the injection locking In the state optimization interval, the adjustment unit adjusts the operating parameters of the first FP laser so that the first FP laser can operate in the injection locking state optimization interval, thereby enabling the transmitter to have good performance, for example, a small frequency.啾, large modulation bandwidth, etc.; in addition, due to the emission Low costs preclude the use of FP laser, the power consumption is small, and therefore, the transmitter is applicable to the PON system of high transfer rate. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention or the description of the prior art will be briefly described below. Obviously, the drawings described below are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

FIG. 1 is a schematic structural diagram of a passive optical network system according to an embodiment of the present invention.

2 is a schematic block diagram of a transmitter in accordance with an embodiment of the present invention.

3 is another schematic block diagram of a transmitter in accordance with an embodiment of the present invention.

4 is still another schematic block diagram of a transmitter in accordance with an embodiment of the present invention.

FIG. 5 is a schematic flow chart of a method for transmitting an optical signal according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without making creative labor are within the scope of the present invention.

1 is a schematic structural diagram of a PON system of a passive optical network according to an embodiment of the present invention. As shown in FIG. 1, the PON system 10 may include at least one optical line terminal (OLT) 11, and an optical distribution. An Optical Distribution Network (ODN) 12 and a plurality of Optical Network Units (ONUs) 13; wherein each of the at least one OLT can manage at least one ONU, but the embodiment of the present invention is not limited thereto.

In the PON system, the direction from the OLT 11 to the ONU 13 is defined as the downlink direction, and the direction from the ONU 13 to the OLT 11 is defined as the uplink direction. In the downlink direction, the OLT 11 broadcasts the downlink data to the plurality of ONUs 13 managed by the OLT 11 by using a Time Division Multiplexing (TDM) method, and each of the ONUs 13 receives only the data carrying the identifier thereof; A plurality of ONUs 13 communicate with the OLT 11 in a manner of Time Division Multiple Access (TDMA), and each ONU 13 transmits uplink data in strict accordance with the time slot allocated by the OLT 11. With the above mechanism, the downlink optical signal sent by the OLT 11 is a continuous optical signal; and the upstream optical signal sent by the ONU 13 is a burst optical signal.

The PON system 10 may be a communication network system that does not require any active devices to implement data distribution between the OLT 11 and the ONU 13, for example, in a particular embodiment, data distribution between the OLT 11 and the ONU 13 may be through an ODN. A passive optical device (such as a splitter) in 12 is implemented. Moreover, the passive optical network system 10 can be an Asynchronous Transfer Mode Passive Optical Network (ATM PON) system or a Broadband Passive Optical Network (Bandwidth Passive Optical Network) defined by the ITU-T G.983 standard. , BPON) system, Gigabit Passive Optical Network (GPON) system defined by ITU-T G.984 standard, Ethernet Passive Optical Network (EPON) defined by IEEE 802.3ah standard, or next generation without Source Optical Network (NGPON), such as XGPON or 10G EPON. The entire contents of the various passive optical network systems defined by the above standards are incorporated herein by reference.

The OLT 11 is usually located in a central office (CO), and can manage at least one ONU 13 in a unified manner and transfer data between the ONU 13 and an upper layer network. Specifically, the OLT 11 can serve as the ONU 13 and the upper layer network (such as the Internet, public switched telephone network (Public) The medium between the Switched Telephone Network (PSTN) forwards the data received from the upper layer network to the ONU 13, and forwards the data received from the ONU 13 to the upper layer network. The specific configuration of the OLT 11 may vary depending on the particular type of the PON system 10. For example, in one embodiment, the OLT 11 may include a transmitter and a receiver for transmitting downlinks to the ONU 13. The continuous optical signal is used by the receiver to receive an uplink burst optical signal from the ONU 13. The downlink optical signal and the uplink optical signal may be transmitted through the ODN 12, but the embodiment of the present invention is not limited thereto.

The ONU 13 can be distributed in a user-side location (such as a customer premises;). The ONU 13 may be a network device for communicating with the OLT 11 and the user, in particular, the ONU 13 may serve as a medium between the OLT 11 and the user, for example, the ONU 13 may receive data from the OLT 11. Forwarded to the user, and the data received from the user is forwarded to the OLT 11. It should be understood that the structure of the ONU 13 is similar to that of an Optical Network Terminal (ONT). Therefore, in the solution provided in this application, the optical network unit and the optical network terminal can be interchanged.

The ODN 12 can be a data distribution network that can include fiber optics, optical couplers, optical splitters, and/or other devices. In one embodiment, the fiber, optical coupler, optical splitter, and/or other device may be a passive optical device, in particular, the optical fiber, optical coupler, optical splitter, and/or other device may be at the OLT 11 Distributing data signals between the ONU 13 and the ONU 13 is a device that does not require power supply support. Specifically, the optical splitter (Splitter) can be connected to the OLT 11 through a trunk fiber, and connected to the plurality of ONUs 13 through a plurality of branch fibers, thereby implementing the OLT 11 and the ONU 13 Point-to-multipoint connections between. In addition, in other embodiments, the ODN 12 may also include one or more processing devices, such as optical amplifiers or relay devices. In addition, the ODN 12 may specifically extend from the OLT 11 to the plurality of ONUs 13, but may be configured as any other point-to-multipoint structure, and the embodiment of the present invention is not limited thereto.

The present invention provides a transmitter suitable for use in a PON system, and is particularly suitable for a high transmission rate PON system, for example, a 10G-PON system or the like. 2 shows a schematic block diagram of a transmitter 200 that may be disposed on the OLT side of a PON system, but embodiments of the present invention are not limited thereto. As shown in FIG. 2, the transmitter 200 includes: a first laser 210, N first Fabry-Perot FP lasers 220, N first optical signal detecting units 230, and N first adjusting units 240, which The N first optical signal detecting units 230 correspond to the N first adjusting units 240 and the N first FP lasers 220, and N is an integer greater than or equal to 1. among them,

The first laser 210 is configured to emit a first optical signal having a single wavelength;

Each of the first Fabry-Perot FP lasers 220 is configured to receive the first laser

a first optical signal of 210, and transmitting a first excitation light signal according to the received first optical signal;

Each of the first optical signal detecting units 230 is configured to detect a first excitation light signal emitted by the first FP laser 220 corresponding to the first optical signal detecting unit 230, and according to the corresponding first FP laser 220 a detection result of the emitted first excitation light signal, determining whether the corresponding first FP laser 220 operates in an injection locking state optimization interval;

Each of the first adjusting unit 240 is configured to detect that the first FP laser 220 corresponding to the first adjusting unit 240 does not operate in the injection locking if the first optical signal detecting unit 230 corresponding to the first adjusting unit 240 detects The state optimization interval adjusts a current operating parameter of the corresponding first FP laser 220 such that the corresponding first FP laser 220 operates in an injection locking state optimization interval.

Therefore, the transmitter provided by the embodiment of the present invention transmits a first optical signal having a single wavelength by the first laser and the first optical signal is transmitted to the first FP laser, if the wavelength of the first optical signal is at the first In the vicinity of a longitudinal mode peak of the FP laser, the first FP laser enters an injection locking state and emits an excitation light signal having the same wavelength as the first optical signal; further, the first optical signal detecting unit corresponds to the first The excitation light signal emitted by the FP laser is detected to determine whether the first FP laser operates in an injection locking state optimization interval, and if the first optical signal detecting unit detects that the first FP laser is not operating in the injection locking state optimization interval, Then, the corresponding first adjusting unit adjusts the operating parameter of the first FP laser, so that the first FP laser can operate in the injection locking state optimization interval, thereby enabling the transmitter to have good performance, for example, a small frequency.啁啾, large modulation bandwidth, etc.; in addition, due to the transmitter FP laser with low-cost, small power consumption, and therefore, the transmitter can be adapted for high transmission rate of the PON system.

In the embodiment of the present invention, the first laser 210 may be any laser capable of emitting an optical signal having a single wavelength, that is, a narrow linewidth single longitudinal mode laser. Preferably, the first laser 210 may be a distributed feedback (DFB) laser, wherein the first optical signal emitted by the DFB laser has a spectrum of continuous wavelengths, and the central wavelength value of the first optical signal may be Located near one of the longitudinal modes of each of the plurality of longitudinal modes of the first FP laser 220, the N first FP lasers 220 may be the same type of laser and have the same physical parameters. The number, but the embodiment of the invention is not limited thereto.

The first optical signal emitted by the first laser 210 can be used as a seed optical signal for each of the first FP lasers 220. Each of the first FP lasers 220 can enter an injection-locked state after receiving the first optical signal, and emit the first excitation light signal in an injection-locked state. The wavelength of the first excitation light signal emitted by each of the first FP lasers 220 is the wavelength of the first optical signal, but the embodiment of the present invention is not limited thereto.

In the embodiment of the present invention, "the operation of an FP laser in the injection locking state optimization interval" means that the FP laser is in an optimized injection locking state, that is, the optical signal emitted by the FP laser satisfies a preset optimization condition, for example, the FP laser. The wavelength of the emitted optical signal, the extinction ratio, and/or the optical power of the optical signal are in accordance with a preset optimization condition. The preset optimization condition may be determined according to the specific requirements of the actual application, which is not limited by the embodiment of the present invention. Correspondingly, "an FP laser does not operate in the injection locking state optimization interval" means that the FP laser is in an unoptimized injection-locked state or the FP laser is not in an injection-locked state, that is, the optical signal emitted by the FP laser does not satisfy the preset The conditions are optimized, but embodiments of the invention are not limited thereto.

In the embodiment of the present invention, in order to detect each of the N first FP lasers 220, the transmitter 200 includes N first optical signal detecting units 230 and N first adjusting units 240. The N first FP lasers 220 correspond to the N first first optical signal detecting units 230 and the N first adjusting units 240, that is, the i-th first FP laser 220 and the ith first The optical signal detecting unit 230 and the i-th first adjusting unit 240 are corresponding to each other, wherein l≤i≤N, but the embodiment of the present invention is not limited thereto.

A first optical signal detecting unit 230 is configured to detect a first excitation light signal transmitted from the first FP laser 220 corresponding to the optical signal detecting unit 230. Optionally, the first optical signal detecting unit 230 may detect one or more parameters of the first excitation optical signal, for example, optical power, extinction ratio, optical modulation amplitude, side mode suppression ratio, and the like. An optical signal detecting unit 230 may further determine whether the first FP laser 220 operates in an injection locking state optimization interval according to the detection result of the first excitation light signal. The first optical signal detecting unit 230 can determine whether the first FP laser 220 operates in the injection locking state optimization interval according to preset optimization conditions, but the embodiment of the present invention is not limited thereto.

Preferably, each of the first optical signal detecting units 230 is configured to detect at least one of the following parameters of the first excitation light signal: an output power and an extinction ratio, and correspondingly, each of the first optical signal detecting units 230 Also used when detecting that the first excitation light signal satisfies at least one of the following conditions, Determining that the corresponding first FP laser is not operating in the injection locking state optimization interval: the absolute value of the difference between the optical power and the preset optical power is greater than the difference between the first preset threshold and the extinction ratio and the preset extinction ratio The absolute value is greater than the second preset threshold.

At this time, a preset optimization condition in which the FP laser 220 operates in the optimized injection locking state may be that the absolute value of the difference between the optical power of the excitation light signal and the preset optical power emitted by the FP laser is less than or equal to the first predetermined width. a value, or an absolute value of a difference between an extinction ratio of the excitation light signal emitted by the FP laser and a preset extinction ratio is less than or equal to a second predetermined threshold, or an excitation light signal emitted by the FP laser simultaneously satisfies the above two conditions . Correspondingly, if the first FP laser 220 has a predetermined threshold, and/or the absolute value of the difference between the extinction ratio of the first excitation light signal and the preset extinction ratio of the first FP laser 220 is greater than the second pre- When the threshold is set, the first optical signal detecting unit 230 may determine that the first FP laser 220 is not operating in the injection locking state optimization interval. The preset optical power and the preset extinction ratio may respectively correspond to the optical power and extinction ratio of the optical signal emitted by the first FP laser 220 in a desired state, the first preset threshold and the second pre- The value of the present invention can be set in advance according to actual needs, which is not limited by the embodiment of the present invention.

The first optical signal detecting unit 230 can be implemented by a plurality of devices. Preferably, each of the first optical signal detecting units 230 includes:

An optical band-pass filter (OBPF) is configured to filter the received first excitation light signal to obtain a first excitation light signal in a preset passband;

A monitor photo Detector (MPD) is used for photodetection of the first excitation light signal filtered by the optical band pass filter.

The preset passband may be determined according to actual needs. For example, for a 10G PON system, the preset passband may be 1577 nm ± 2 nm, but the embodiment of the present invention is not limited thereto.

In the embodiment of the present invention, the input end of the first optical signal detecting unit 230 may be directly connected to the output end of the corresponding first FP laser 220. Alternatively, as another embodiment, the transmitter 200 may also be The method further includes: N first optical splitters, wherein the N first optical splitters correspond to the N first FP lasers 220 and the N first optical signal detecting units 230, wherein each of the first optical splitters is used for Separating the first excitation light signal emitted by the first FP laser 220 corresponding to the first beam splitter into two first excitation light signals, wherein one of the first excitation light signals is transmitted to the first beam splitter The first optical signal detecting unit 230 has another first excitation optical signal as an output optical signal of the corresponding first FP laser 220. At this time, the output end of each of the first FP lasers 220 is connected to the input end of the corresponding first optical splitter, and the output end of the first optical splitter and the corresponding input of the first optical signal detecting unit 230 End connection. Optionally, the two first excitation optical signals divided by the first optical splitter may have different power values. For example, the first optical splitter may use 95% of the first excitation optical signal as the corresponding first. The FP laser 220 outputs an optical signal, and transmits 5% of the first excitation optical signal to the corresponding first optical signal detecting unit 230, but the embodiment of the present invention is not limited thereto.

In the embodiment of the present invention, if the first optical signal detecting unit 230 determines that the corresponding first FP laser 220 operates in the injection locking state optimization interval, the first adjusting unit 240 may not correspond to the corresponding first FP laser. 220. Performing any operation; Optionally, as another embodiment, if the first optical signal detecting unit 320 determines that the corresponding first FP laser 220 is not operating in the injection locking state optimization interval, the first adjusting unit 240 The operating parameters of the corresponding first FP laser 220 can be adjusted according to the detection result of the first optical signal detecting unit 320, wherein the operating parameters and adjustment rules that need to be adjusted can be preset, which is used in the embodiment of the present invention. Not limited.

Optionally, the first adjusting unit 240 may adjust at least one of the following operating parameters of the first FP laser 220 corresponding to the first adjusting unit 240: an operating temperature and a bias current.

Specifically, the first adjusting unit 240 may adjust the operating parameters of the corresponding first FP laser 220 according to a preset rule. Optionally, the first adjusting unit 240 may preferentially adjust the first FP laser 220. a bias current, wherein the adjustment of the bias current by the first adjusting unit 240 does not exceed a preset adjustment range. If the adjustment of the bias current by the first adjusting unit 240 does not enable the corresponding first FP laser 220 to operate in the injection locking state optimization interval, the first adjusting unit 240 may further adjust the corresponding first The operating temperature of the FP laser 220, specifically, the first adjusting unit 240 can change the operating temperature of the corresponding first FP laser 220 by adjusting the temperature of the heater of the corresponding first FP laser 220, but The embodiment of the invention is not limited thereto. Optionally, as another embodiment, the first adjusting unit 240 may further set different adjusting conditions, each adjusting condition corresponding to an adjusting rule; and the first optical signal detecting unit 230 detects the corresponding one. The parameter of the first excitation light signal emitted by the first FP laser 220 satisfies which of the different adjustment conditions, and the first adjustment unit 240 responds to the corresponding first according to the adjustment rule corresponding to the satisfied adjustment condition. The FP laser 220 is adjusted. For example, two adjustment conditions and two adjustment rules can be set in advance. Wherein, the first adjustment condition is ^ ^ i - ^ , where is the extinction ratio of the detected first excitation light signal. For the preset extinction ratio, ". And both are constant and ". < The adjustment rule corresponding to the first adjustment condition is to adjust the bias current within a preset range; the second adjustment condition is n _] < \R - R ₀ \ ≤ n ₂ , « ₂ is a constant and < w ₂ The adjustment rule corresponding to the second adjustment condition is to adjust the temperature, but the embodiment of the invention is not limited thereto.

In an embodiment of the invention, the transmitter 200 can include one or more first FP lasers 220. If the transmitter 200 includes a first FP laser 220, the input end of the first FP laser 220 can be connected to the output end of the first laser 210, and the first FP laser 220 can directly receive the first laser 210. The first optical signal emitted. Optionally, as another embodiment, if the transmitter 200 includes multiple first FP lasers 220, the transmitter 200 may further include a first optical power splitter 250 for transmitting the first laser 210. The first optical signal is divided into multiple first optical signals, and each of the plurality of first FP lasers 220 can receive one of the plurality of first optical signals output by the first optical power splitter. The first optical signal. Accordingly, as shown in FIG. 3, the transmitter 200 further includes:

a first optical power splitter 250, configured to divide the first optical signal emitted by the first laser 210 into N first optical signals;

Correspondingly, each of the first FP lasers 220 is specifically configured to receive a first optical signal of the N first optical signals.

At this time, as shown in FIG. 2, the output end of the first laser 210 is connected to the input end of the first optical power splitter 250, and the output ends of the first optical power splitter 250 are respectively associated with the multiple The input terminals of the first FP laser 220 are connected. The first optical power splitter 250 can split the first optical signal emitted by the first laser 210 by power to obtain multiple first optical signals having the same wavelength, and correspondingly, the first FP laser 220 Receiving, by the first laser 210, a first optical signal that is separated by the first optical power splitter 250. Optionally, the number of the plurality of first FP lasers 220 may be equal to the number of paths of the first optical signal obtained after the first optical power splitter 250 is separated, but the embodiment of the present invention is not limited thereto.

Optionally, as another embodiment, the transmitter 200 may further include an optical isolator, an input end of the optical isolator may be connected to an output end of the first laser 210, and an output end of the optical isolator and the optical isolator The first optical power splitter 250 or the input ends of the N first FP lasers 220 are connected to allow only the optical signals of the first laser 210 to the N first FP lasers 220 to pass, to avoid Optical signals from the N first FP lasers 220 to the direction of the first laser 210 The first optical signal is interfered with, but the embodiment of the present invention is not limited thereto. Optionally, as another embodiment, the transmitter 200 may further include at least one optical amplifier, where the optical amplifier may be disposed between the first laser 210 and the N first FP lasers 220, or disposed on the N After the first FP laser 220 is used, the received optical signal is amplified according to a certain gain value, and the embodiment of the present invention is not limited thereto.

In an embodiment of the present invention, an output optical signal of the N first FP lasers 220 may be used as an output optical signal of the transmitter 220. Optionally, as another embodiment, the N first FP lasers 220 transmit The first excitation light signal can also serve as a seed light signal for other FP lasers. Specifically, some or all of the first FP lasers 220 of the N first FP lasers 220 may serve as seed lasers for the second FP laser. FIG. 3 exemplarily shows a case where one of the two first FP lasers of the transmitter 200 serves as a seed laser of the second FP laser. As shown in FIG. 3, the transmitter 200 further includes: a second optical power splitter 260 and at least one second _FP laser 270, wherein

Each of the second optical power splitters 260 is configured to split the first excitation optical signal output by the first FP laser 220 of the N first FP lasers 220 into multiple first excitation optical signals; The second FP laser 270 is configured to receive a first excitation light signal of the plurality of first laser signals, and emit a second excitation light signal according to the received first excitation light signals.

At this time, one output end of the first beam splitter may be connected to the corresponding first optical signal detecting unit 230, and the other output end may be connected to the second optical power splitter 260, and the second optical power splitting The output of the path 260 is coupled to the input of at least one second FP laser 270. Specifically, a second optical power splitter 260 can be used to divide the output optical signal of a first FP laser 220 into multiple first excitation optical signals in accordance with power. Optionally, a part of the first excitation light signals from the plurality of first excitation light signals of one first FP laser 220 may be used as an output optical signal of the transmitter 200, and another part of the first excitation light signals may be input to the In the second FP laser 270; or, the plurality of first excitation light signals from one first FP laser 220 are all input to the plurality of second FP lasers 270, but the embodiment of the invention is not limited thereto.

In the embodiment of the present invention, the number of the at least one second optical power splitter 260 may be equal to the number of the first FP lasers 220 as the seed laser. Optionally, the number of the at least one second FP laser 270 may be equal to the total number of the multiple first excitation light signals obtained by the at least one second optical power splitter 260. At this time, the multiple first excitation light Each of the first excitation signals in the signal Number as a seed optical signal of a second FP laser 270 in the at least one second FP laser 270; alternatively, as another embodiment, as shown in FIG. 4, the number of the at least one second FP laser 270 Or less than the total number of the plurality of first excitation light signals obtained by the at least one second optical power splitter 260, and the optical signal that is not transmitted to the second FP laser 270 in the plurality of first excitation light signals may be used as the The optical signal of the transmitter 200 is output, but the embodiment of the present invention is not limited thereto.

Illustratively, as shown in FIG. 3, the first excitation light signal emitted by one of the two first FP lasers 220 included in the transmitter 200 is divided by the second optical power splitter 270. The two first excitation light signals are respectively used as the first optical signals of the two second FP lasers 270. At this time, the first FP laser 220 as the seed laser is not loaded with the modulation current, and the first excitation light signal emitted by the first FP laser 220 is an unmodulated DC optical signal. In this case, in the two second FP lasers 270. Each of the second FP lasers 270 is loaded with a modulation current, and correspondingly, the second excitation light signals emitted by the two second FP lasers 270 are modulated optical signals.

Preferably, the first excitation light signal received by each of the second optical power splitters is an unmodulated direct current optical signal.

Optionally, as another embodiment, as shown in FIG. 4, the second optical power splitter 260 separates the first excitation light signal emitted by the first FP laser 220 into two first excitation light signals, one of which is As the output optical signal of the transmitter 200, the other path serves as the seed optical signal of the second FP laser 270. Since the modulation current is applied to the first FP laser 220 as the seed laser, the first excitation light signal emitted by the first FP laser 220 as the first laser is a modulated optical signal. The FP laser 270 is loaded with a modulation current, but the embodiment of the present invention is not limited thereto.

Optionally, in another embodiment, the transmitter 200 further includes: at least one second optical signal detecting unit 280 and at least one second adjusting unit 290, the at least one second optical signal detecting unit 280 and the at least one a second adjusting unit 290 and the at least one second FP laser 270 - corresponding to,

Each of the second optical signal detecting units 280 is configured to detect a second excitation light signal emitted by the second FP laser 270 corresponding to the second optical signal detecting unit 280, and determine the corresponding second according to the detection result. Whether the FP laser 270 operates in the injection locking state optimization interval; each of the second adjusting units 290 is configured to adjust the phase if the second FP laser 270 corresponding to the second adjusting unit 290 does not operate in the injection locking state optimization interval Corresponding current operating parameters of the second FP laser 270 such that the corresponding second FP laser 270 is injecting Lock the optimization interval.

The number of the at least one second FP laser 270 and the at least one second optical signal detecting unit 280 and the at least one second adjusting unit 290 may be the same, and the ith second FP laser 270 and the ith second light The signal detecting unit 280 and the ith second adjusting unit 290 are three-corresponding. In the embodiment of the present invention, the connection manner between the at least one second FP laser and the at least one second optical signal detecting unit 280 and the at least one second adjusting unit 290 may be the same as the foregoing N first FP lasers. 220 is similar to the connection between the N first optical signal detecting units 230 and the N first adjusting units 240, and the at least one second optical signal detecting unit 280 detects the at least one second FP laser 270 and the The adjustment of the second FP laser 270 that is not operating in the injection locking state optimization interval by the at least one second adjustment unit 290 is similar to that described above for the first FP laser 220, and is not described herein again for the sake of brevity.

Optionally, as another embodiment, at least one second beam splitter may be disposed between the output end of the at least one second FP laser 270 and the input end of the at least one second optical signal detecting unit 280, the at least one The second beam splitter is in one-to-one correspondence with the at least one second FP laser 270 and the at least one second optical signal detecting unit 280, wherein each of the second beam splitters is configured to use a second FP corresponding to the second beam splitter The second excitation light signal emitted by the laser 270 is split into two second excitation light signals, wherein one second excitation light signal is transmitted to the second optical signal detection unit 280 corresponding to the second optical splitter, and the other second excitation The optical signal serves as an output optical signal of the corresponding second FP laser 270.

Optionally, as another embodiment, part or all of the second FP lasers in the at least one second FP laser 270 may also serve as a seed laser of the third FP laser, and so on, and operate in an injection locking state optimization interval. The FP laser can be used as a seed laser of a lower-stage FP laser. Therefore, the transmitter 200 can integrate a plurality of FP lasers to implement a plurality of transmission ports, which is not limited in the embodiment of the present invention.

Therefore, the transmitter provided by the embodiment of the present invention transmits a first optical signal having a single wavelength by the first laser and the first optical signal is transmitted to the first FP laser, if the wavelength of the first optical signal is at the first In the vicinity of a longitudinal mode peak of the FP laser, the first FP laser enters an injection locking state and emits an excitation light signal having the same wavelength as the first optical signal; further, the first optical signal detecting unit corresponds to the first The excitation light signal emitted by the FP laser is detected to determine whether the first FP laser operates in an injection locking state optimization interval, if the first optical signal detecting unit detects that the first FP laser is not operating in the injection locking state optimization region And the corresponding first adjusting unit adjusts the operating parameter of the first FP laser, so that the first FP laser can operate in the injection locking state optimization interval, thereby enabling the transmitter to have good performance, for example, Small frequency chirp, large modulation bandwidth, etc. In addition, since the FP laser used in the transmitter is low in cost and low in power consumption, the transmitter can be applied to a PON system with a high transmission rate.

A transmitter according to an embodiment of the present invention is described in detail above with reference to Figs. 1 through 4, and a method for transmitting an optical signal according to an embodiment of the present invention will be described below with reference to Fig. 5.

FIG. 5 shows a schematic flow diagram of a method 300 for transmitting an optical signal, which may be performed by transmitter 200, in accordance with an embodiment of the present invention.

S310. Generate a first optical signal having a single wavelength.

S320. Generate, according to the first optical signal, each first FP laser of the N first FP lasers to generate a first excitation light signal, where N is an integer greater than or equal to 1.

The first optical signal serves as a seed optical signal for the N first FP lasers. The N first FP lasers of the transmitter enter an injection-locked state upon excitation of the first optical signal and emit N first excitation light signals.

S330. Detect a first excitation light signal generated by the N first FP lasers, and determine, according to a detection result of the N first excitation light signals, whether the N first FP lasers are operating in an injection locking state optimization interval.

The transmitter detects each of the N first excitation light signals, and determines whether the first FP laser that emits the first excitation light signal works according to the detection result of the first excitation light signal In the injection lock state optimization interval.

S340, if the first FP lasers in the N first FP lasers are not operating in the injection locking state optimization interval, the transmitter adjusts the current operating parameters of the first FP laser that is not operating in the injection locking state optimization interval, to The first FP laser that is not operating in the injection locking state optimization interval is caused to operate in the injection locking state optimization interval.

Therefore, the method for transmitting an optical signal provided by the embodiment of the present invention, the first FP laser of the transmitter transmits the first excitation optical signal when receiving the first optical signal having a single wavelength, and the transmitter is the first Excitation light signal is detected to determine whether the first FP laser operates in an injection locking state optimization interval, and if the transmitter detects that the first FP laser is not operating in the injection locking state optimization interval, the first FP laser operates The parameters are adjusted such that the first FP laser can operate in an injection locking state optimization interval, thereby enabling the transmitter to The first excitation light signal emitted has good performance, for example, a small frequency 啁啾, a large modulation bandwidth, and the like; in addition, since the method can use a low cost and low power consumption FP laser, The method is capable of transmitting multiple optical signals and is suitable for high transmission rate PON systems.

Optionally, S330, detecting the first excitation light signal generated by the N first FP lasers, including:

5331: Filter each of the N first excitation light signals to obtain N first excitation light signals in a preset passband;

5332. Perform photodetection on the N first excitation light signals in the preset passband. The S331 may be specifically performed by the OBPF of the transmitter, and the S332 may be performed by the MPD of the transmitter, but the embodiment of the present invention is not limited thereto.

Optionally, as another embodiment, S330 or S332 may be specifically configured to detect at least one of the following parameters of the N first excitation signals: an output power and an extinction ratio;

Correspondingly, S330 determines whether the N first FP lasers are operating in an injection locking state optimization interval according to the detection result of the N first excitation light signals, including:

If the first excitation light signal of the N first excitation light signals satisfies at least one of the following preset conditions, determining that the first FP laser that generates the first excitation light signal that meets the preset condition does not operate in the injection locking The state optimization interval: the absolute value of the difference between the outgoing power and the preset optical power is greater than the first preset threshold and the absolute value of the difference between the extinction ratio and the preset extinction ratio is greater than the second preset threshold.

Optionally, as another embodiment, S320, generating, according to the first optical signal, each first FP laser of the N first FP lasers to generate the first excitation light signal, including:

5321, dividing the first optical signal into multiple first optical signals;

S322, each of the first FP lasers generates a first excitation light signal according to a first optical signal of the plurality of first optical signals.

Optionally, as another embodiment, the current operating parameter includes at least one of the following parameters: an operating temperature and a bias current.

Correspondingly, the current operating parameter of the first FP laser may be adjusted to adjust the operating temperature and/or the bias current of the first FP laser, which is not limited in this embodiment of the present invention.

Optionally, S340, adjusting a current operating parameter of the first FP laser that is not operating in the injection locking state optimization interval, so that the first FP laser that is not operating in the injection locking state optimization interval operates in an injection locking state optimization interval, Includes:

S341, adjusting the first operation in the optimization interval of the injection locking state within a preset adjustment range The bias current of the FP laser;

S342. If the adjustment of the bias current fails to operate the first FP laser in the injection locking state optimization interval, adjust the operating temperature of the first FP laser that is not operating in the injection locking state optimization interval.

Wherein, the bias current can be used for fine adjustment, and the operating temperature can be used for coarse adjustment, but the embodiment of the invention is not limited thereto.

Optionally, as another embodiment, the method 300 further includes:

And dividing part or all of the first excitation light signals of the N first excitation light signals to obtain a plurality of first excitation light signals;

Each of the at least one second FP laser generates a second excitation light signal according to a first excitation light signal of the plurality of first excitation light signals;

Detecting at least one second excitation light signal generated by the at least one second FP laser, and determining, according to the detection result of the at least one second excitation light signal, whether the at least one second FP laser is operating in an injection locking state optimization Interval

If the at least one second FP laser of the transmitter includes a second FP laser that is not operating in the injection locking state optimization interval, adjusting a current operating parameter of the second FP laser that is not operating in the injection locking state optimization interval, so that the current FP laser The second FP laser that is not operating in the injection locking state optimization interval operates in the injection locking state optimization interval.

The first excitation light signal that is shunted may be specifically the first excitation light signal generated by the first FP laser under the adjusted operating parameter, but the embodiment of the present invention is not limited thereto.

Optionally, if a modulation current is applied to the N first FP lasers, the first excitation light signals emitted by the N first FP lasers are modulated optical signals, and at this time, if the N first FPs Part or all of the first FP laser in the laser as the seed laser of the second FP laser may not load the modulation current on the at least one second FP laser; alternatively, as another embodiment, if not as a seed laser The first FP laser is loaded with a modulation current, and the first excitation light signal emitted by the first FP laser is an unmodulated direct current optical signal, and at this time, each second FP of the at least one second FP laser may be The modulation current is applied to the laser such that the at least one second FP laser emits the modulated optical signal, but embodiments of the invention are not limited thereto.

Optionally, the shunted first excitation light signal is a direct current unmodulated optical signal;

Correspondingly, each of the at least one second FP laser is in accordance with the multipath Generating a first excitation light signal in an excitation light signal to generate a second excitation light signal, comprising: each of the second FP lasers generating a second excitation light signal according to the DC unmodulated optical signal.

In method 300, the first excitation light signal and the second excitation light signal can be detected in the same manner, and a similar method is used to determine whether the first FP laser and the second FP laser are operating in an injection locking state. The interval is optimized, and the first FP laser and the second FP laser are adjusted in a similar manner. For brevity, no further details are provided herein.

It should be understood that the size of the sequence numbers of the above processes does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention.

The method 300 for transmitting an optical signal in accordance with an embodiment of the present invention may be implemented in accordance with various modules and/or functions of the transmitter 200 in accordance with an embodiment of the present invention, and for the sake of brevity, no further details are provided herein.

Therefore, the method for transmitting an optical signal provided by the embodiment of the present invention is applied to an optical transmitter, and the first FP laser transmits a first excitation optical signal when receiving the first optical signal having a single wavelength, and the first The excitation light signal is detected to determine whether the first FP laser operates in an injection locking state optimization interval, and if the first FP laser is detected to be in the injection locking state optimization interval, the operating parameters of the first FP laser are adjusted. The first FP laser is enabled to operate in an injection locking state optimization interval, thereby enabling the first excitation light signal emitted by the transmitter to have good performance, for example, a small frequency chirp, a large modulation bandwidth, and the like; In addition, since the method can use a low cost and low power consumption FP laser, the method is capable of transmitting a plurality of optical signals and is suitable for a high transmission rate PON system.

It should be understood that in the embodiments of the present invention, the term and/or merely an association describing the associated object indicates that there may be three relationships. For example, A and / or B, can mean: A exists separately, there are A and B, and there are three cases of B alone. In addition, the character / in this article generally indicates that the contextual object is an OR relationship.

Those skilled in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the steps and composition of the various embodiments have been generally described in terms of function in the foregoing description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. One of ordinary skill in the art can use different methods to implement the described functions for each particular application, but such implementation should not It is considered to be outside the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection. The components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention. Modifications or substitutions, these modifications or substitutions should be covered by the scope of protection of the present invention within. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A transmitter, comprising: a first laser, N first Fabry-Perot FP lasers, N first optical signal detecting units, and N first adjusting units, said N The first optical signal detecting unit has a one-to-one correspondence with the N first adjusting units and the N first FP lasers, where N is an integer greater than or equal to 1, wherein

The first laser is configured to emit a first optical signal having a single wavelength;

Each of the first FP lasers is configured to receive the first optical signal from the first laser and to emit a first excitation optical signal according to the received first optical signal;

Each of the first optical signal detecting units is configured to detect a first excitation light signal emitted by a first FP laser corresponding to the first optical signal detecting unit, and transmit according to the corresponding first FP laser a detection result of the first excitation light signal, determining whether the corresponding first FP laser operates in an injection locking state optimization interval;

Each of the first adjusting units is configured to: if the first optical signal detecting unit corresponding to the first adjusting unit detects that the first FP laser corresponding to the first adjusting unit is not working in the injection locking state optimization And adjusting a current operating parameter of the corresponding first FP laser such that the corresponding first FP laser operates in an injection locking state optimization interval.

2. The transmitter according to claim 1, wherein the first optical signal detecting unit comprises:

An optical band pass filter, configured to filter the received first excitation light signal to obtain a first excitation light signal in a preset pass band;

The monitoring photodetector is configured to perform photoelectric detection on the first excitation light signal filtered by the optical band pass filter.

The transmitter according to claim 1 or 2, wherein the N first FP lasers are specifically a plurality of first FP lasers, and the transmitter further comprises:

a first optical power splitter, configured to divide the first optical signal emitted by the first laser into

N way first light signal;

Each of the first FP lasers is specifically configured to receive a first optical signal of the N first optical signals.

The transmitter according to any one of claims 1 to 3, wherein the transmitter further comprises: at least one second optical power splitter and at least one second FP laser, wherein each a second optical power splitter for using one of the N first FP lasers a first excitation light signal output by the FP laser is divided into a plurality of first excitation light signals; each of the second FP lasers is configured to receive a first excitation light signal of the plurality of first laser signals, and according to the The received first excitation light signal is transmitted to emit a second excitation light signal.

The transmitter according to claim 4, wherein the first excitation light signal received by each of the second optical power splitters is an unmodulated direct current optical signal.

The transmitter according to claim 4 or 5, wherein the transmitter further comprises: at least one second optical signal detecting unit and at least one second adjusting unit, the at least one second optical signal detecting a unit corresponding to the at least one second adjustment unit and the at least one second FP laser, wherein

Each of the second optical signal detecting units is configured to detect a second excitation light signal emitted by the second FP laser corresponding to the second optical signal detecting unit, and determine the corresponding second according to the detection result Whether the FP laser operates in the injection locking state optimization interval;

Each of the second adjusting units is configured to adjust a current working parameter of the corresponding second FP laser if the second FP laser corresponding to the second adjusting unit does not operate in an injection locking state optimization interval The corresponding second FP laser is placed in an injection locking optimization interval.

The transmitter according to any one of claims 1 to 6, wherein each of the first optical signal detecting units is specifically configured to detect at least one of the following parameters of the first excitation light signal: Light output power and extinction ratio;

Each of the first optical signal detecting units is further configured to: when it is detected that the first excitation light signal satisfies at least one of the following conditions, determine that the corresponding first FP laser is not operating in an injection locking state optimization interval: The absolute value of the difference between the optical power and the preset optical power is greater than the first preset threshold and the absolute value of the difference between the extinction ratio and the preset extinction ratio is greater than the second preset threshold.

The transmitter according to any one of claims 1 to 7, wherein the current operating parameter comprises at least one of the following parameters: an operating temperature and a bias current.

The transmitter according to any one of claims 1 to 8, wherein the first laser is a distributed feedback laser.

10. A method for emitting an optical signal, comprising:

Generating a first optical signal having a single wavelength;

Generating, according to the first optical signal, each first FP laser of the N first Fabry-Perot FP lasers, wherein N is an integer greater than or equal to 1; Detecting a first excitation light signal generated by the N first FP lasers, and determining, according to a detection result of the N first excitation light signals, whether the N first FP lasers are operating in an injection locking state optimization interval ;

If the first FP laser is not operating in the injection locking state optimization interval, adjusting the current operating parameter of the first FP laser that is not operating in the injection locking state optimization interval, so that the first operation is not in the injection locking state optimization interval An FP laser operates in an injection lock state optimization interval.

The method according to claim 10, wherein the detecting the first excitation light signal generated by the N first FP lasers comprises:

Filtering each of the N first excitation light signals to obtain N first excitation light signals in a preset passband;

Photodetecting the N first excitation light signals in the preset passband.

The method according to claim 10 or 11, wherein the generating, by the first FP laser, the first excitation light signal by the first FP laser according to the first optical signal comprises:

Dividing the first optical signal into multiple first optical signals;

Each of the first FP lasers generates a first excitation light signal based on one of the plurality of first optical signals.

The method according to any one of claims 10 to 12, wherein the method further comprises:

And dividing a part or all of the first excitation light signals of the N first excitation light signals to obtain a plurality of first excitation light signals;

Each second FP laser of the at least one second FP laser generates a second excitation light signal according to one of the plurality of first excitation light signals;

Detecting at least one second excitation light signal generated by the at least one second FP laser, and determining, according to the detection result of the at least one second excitation light signal, whether the at least one second FP laser is operating in the injection Locked state optimization interval;

If the second FP laser is not operating in the injection locking state optimization interval, adjusting the current operating parameter of the second FP laser that is not operating in the injection locking state optimization interval, so that the first operation is not in the injection locking state optimization interval The two FP lasers operate in the injection locking state optimization interval.

14. The method according to claim 13, wherein the shunted first excitation signal is a direct current unmodulated optical signal;

Each of the at least one second FP laser generates a second excitation light signal according to a first excitation light signal of the plurality of first excitation light signals, including:

Each of the second FP lasers generates a second excitation light signal according to the DC unmodulated optical signal.

The method according to any one of claims 10 to 14, wherein the detecting the first excitation light signal generated by the N first FP lasers comprises:

Detecting at least one of the following parameters of the N first excitation light signals: an output power and an extinction ratio;

Determining, according to the detection result of the N first excitation light signals, whether the N first FP lasers are operating in an injection locking state optimization interval, including:

If the first excitation light signal satisfies at least one of the following preset conditions, determining that the first FP laser that generates the first excitation light signal that satisfies the preset condition does not operate in the injection locking state optimization interval: The absolute value of the difference in the extinction ratio is greater than the second predetermined threshold.

The method according to any one of claims 10 to 15, wherein the current operating parameter comprises at least one of the following parameters: operating temperature and bias current.