CN212136886U

CN212136886U - High-stability optical transmitter

Info

Publication number: CN212136886U
Application number: CN202020365322.7U
Authority: CN
Inventors: 阳飞
Original assignee: Mianyang Jingheng Optical Communication Co ltd
Current assignee: Mianyang Jingheng Optical Communication Co ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-12-11
Anticipated expiration: 2030-03-20

Abstract

The utility model relates to a technical field of optical communication equipment, the purpose provides a high stability light transmitter, include: the TO tube comprises a TO tube seat and a TO tube cap arranged on the TO tube seat, wherein a sealed cavity is formed between the TO tube seat and the TO tube cap, a lens is arranged on one side of the TO tube cap, which is opposite TO the TO tube seat, in a penetrating manner, and the central axis of the TO tube seat is coaxial with the optical axis of the lens; the TO tube base is provided with a refrigerator, the refrigerator is provided with a heat sink, the heat sink is vertical TO the central axis of the TO tube base, the heat sink is provided with a prism, a light emitter and a backlight monitor, the prism and the backlight tube are respectively positioned at two sides of the light emitter, and the lens is positioned right above the prism, the light emitter and the backlight monitor; the heat sink is also provided with a temperature sensor; the TO tube seat is also provided with a pin seat, and a plurality of pins which are respectively used for connecting the refrigerator, the light emitter, the backlight monitor and the temperature sensor with an external device are arranged on the pin seat in a penetrating way. The utility model has the advantages of improve the stability of light emitter component's wavelength.

Description

High-stability optical transmitter

Technical Field

The utility model relates to a technical field of optical communication equipment, concretely relates to high stability light transmitter.

Background

With the implementation of three-network integration and the rapid development of internet of things and cloud computing, the demand of users on bandwidth is increasing rapidly, and the transmission rate and capacity of the existing optical fiber communication network (backbone network, metropolitan area network and access network) are urgently needed to be improved. The DWDM system is widely applied in a backbone network and gradually permeates into a metropolitan area network with the advantages of huge bandwidth resources, abundant service access types, easy upgrading and expansion, fiber resource saving and the like. PONs with higher transmission rates, higher splitting ratios, stronger networking capabilities and better compatibility rates up to 10Gb/s have been commercially available at access network scale. The DWDM system requires that the wavelength interval is 0.2 nm-1.6 nm, 10Gb/s optical emission signals with 1577nm (1575-1580 nm) are downlink at a 10Gb/s PON Optical Line Terminal (OLT), which puts high requirements on the chirp effect and the stability of the emitted light wavelength of an optical emitter assembly, and the temperature of the emitted light wavelength is easily influenced by the temperature.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high stability light transmitter has the advantage that automatic adjustment based on real-time temperature control and the photocurrent of dorsad improves the stability of the wavelength of light emitter subassembly.

In order to achieve the above object, the utility model adopts the following technical scheme: a high stability optical transmitter comprising:

the TO tube comprises a TO tube seat and a TO tube cap arranged on the TO tube seat, wherein a sealed cavity is formed between the TO tube seat and the TO tube cap, a lens is arranged on one side of the TO tube cap, which is opposite TO the TO tube seat, in a penetrating manner, and the central axis of the TO tube seat is coaxial with the optical axis of the lens;

the TO tube base is provided with a refrigerator, the refrigerator is positioned in the sealed cavity, the refrigerator is provided with a heat sink, the heat sink is perpendicular TO the central axis of the TO tube base, the heat sink is provided with a prism, a light emitter and a backlight monitor, the prism and the backlight tube are respectively positioned on two sides of the light emitter, and the lens is positioned right above the prism, the light emitter and the backlight monitor;

the heat sink is also provided with a temperature sensor;

the TO tube seat is further provided with a pin seat, the pin seat is located in the sealed cavity, and a plurality of pins which are respectively used for connecting the refrigerator, the light emitter, the backlight monitor and the temperature sensor with an external device are arranged on the pin seat in a penetrating mode.

By the technical scheme, when the optical transmitter is used, the lens is used for converging the front-phase light generated by the optical transmitter into a collimation state so as to be coupled into an optical fiber for transmission. The heat sink conducts heat generated by the light emitter during working TO the refrigerator for heat exchange, the light emitter is used for dissipating heat, and the refrigerator conducts the heat out through the TO tube seat. Meanwhile, in the working process, the temperature sensor is used for collecting temperature information of the heat sink and outputting the temperature information to the external signal processor, the temperature information processed by the signal processor is sent to the TEC driver, and the TEC driver accurately controls the refrigeration of the refrigerator according to the temperature information and dissipates heat of the light emitter, so that the working environment temperature of the light emitter is kept at a relatively constant temperature, and the stability of the wavelength output by the light emitter is improved. Meanwhile, after the backlight of the light emitter is emitted to the backlight monitor, the forward light output power of the light emitter is monitored in real time, the forward light output power of the light emitter is automatically adjusted through the change of the backlight photocurrent, and the stability of the wavelength output by the light emitter is improved.

Preferably, the lens is an aspherical lens.

Preferably, the refrigerator is a TEC refrigerator.

By the technical scheme, the TEC refrigerator is made by utilizing the Peltier effect of semiconductor materials. The peltier effect is a phenomenon in which when a direct current passes through a couple composed of two semiconductor materials, one end absorbs heat and the other end releases heat.

Preferably, the heat sink is arranged on the cold end of the TEC refrigerator.

Through the technical scheme, the heat sink conducts heat generated by the light emitter during working to the cold end of the TEC refrigerator for heat exchange, and the heat sink is used for dissipating heat of the light emitter. The TEC chiller conducts heat out through the TO tube base by the peltier effect.

Preferably, the temperature sensor comprises a thermistor, and the thermistor is arranged on the heat sink.

Through the technical scheme, the resistance value of the thermistor changes along with the temperature change, and the monitoring of the heat sink temperature is realized. The input end of an external signal processing device is connected with the thermistor through a pin, so that components arranged in the TO tube cap are reduced, and the packaging size of the optical transmitter can be effectively reduced.

Preferably, the TO tube seat is further provided with two pin seats, the two pin seats are located in the sealed cavity, the two pin seats are located on two sides of the refrigerator respectively, and the four pins penetrate through the pin seats.

Through above-mentioned technical scheme, the sealed cavity that forms between rational utilization TO pipe cap and the TO tube socket can effectively reduce the encapsulation size of optical transmitter.

Preferably, the refrigerator, the light emitter, the backlight monitor and the temperature sensor are connected with the pins through gold wires.

Through above-mentioned technical scheme, the pin is used for supplying power and signal transmission to refrigerator, light emitter, backlight monitor and temperature sensor.

Preferably, the backlight monitor is a monitor photodiode MPD.

To sum up, the beneficial effects of the utility model are that:

1. the utility model has the advantages of improving the stability of the wavelength of the light emitter component based on the real-time temperature control and the automatic adjustment of the back photocurrent;

2. the utility model discloses set up aspheric lens in TO pipe cap, need not TO set up lens in the inside of light transmitter, have the encapsulation size that effectively reduces light transmitter, reduction in production cost's advantage.

Drawings

Fig. 1 is a partial cross-sectional view of the present invention;

fig. 2 is a schematic structural view of the pin base for displaying the TO cap according TO the present invention;

fig. 3 is a schematic structural diagram of a semiconductor laser chip for showing a built-in distributed bragg reflector according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a relationship between current injected into the dbr and output wavelength according to an embodiment of the present invention.

In the figure, 1, TO tube seat; 11. a refrigerator; 12. a heat sink; 2. a TO pipe cap; 3. a lens; 4. a prism; 5. a light emitter; 6. a backlight monitor; 7. a thermistor; 8. a pin base; 9. and (7) a pin.

Detailed Description

The technical solution in the embodiments of the present invention is clearly and completely described below with reference to fig. 1 to 4 of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

Referring to fig. 1 and 2, a high stability optical transmitter includes: the structure of the optical transmitter will be described in detail below, including the TO socket 1, the TO cap 2, the refrigerator 11, the prism 4, the optical transmitter 5, and the backlight monitor 6.

Referring TO fig. 1, TO pipe cap 2 sets up on TO tube socket 1, and the light-emitting opening has been seted up just TO one side of TO tube cap 2 TO TO tube socket 1, and the light-emitting opening upper cover of TO tube cap 2 is equipped with the optical window for form sealed cavity between TO tube socket 1 and the TO tube cap 2. An aspheric lens 3 is arranged in a light-emitting opening of the TO pipe cap 2, and the central axis of the TO pipe seat 1 is coaxial with the optical axis of the aspheric lens 3.

It should be noted that, in the optical transmitter, the aspheric lens 3 is disposed in the TO cap 2, and the lens 3 does not need TO be disposed inside the optical transmitter, so that the package size of the optical transmitter can be effectively reduced, and the production cost can be reduced.

Referring TO fig. 1 and 2, a refrigerator 11 is arranged on the TO socket 1, the refrigerator 11 is located in the sealed cavity, a heat sink 12 is arranged on the refrigerator 11, and the heat sink 12 is perpendicular TO the central axis of the TO socket 1. The heat sink 12 is provided with a prism 4, a light emitter 5 and a backlight monitor 6, the prism 4 and the backlight tube are respectively positioned at two sides of the light emitter 5, and the lens 3 is positioned right above the prism 4, the light emitter 5 and the backlight monitor 6. The aspheric lens 3 is used for converging the front-phase light generated by the light emitter 5 into a collimation state so as to be coupled into an optical fiber for transmission. Preferably, the refrigerator 11 is a TEC refrigerator 11, and the heat sink 12 is disposed on the cold end of the TEC refrigerator 11.

Specifically, the heat sink 12 conducts heat generated by the light emitter 5 during operation to the cold end of the TEC refrigerator 11 for heat exchange, so as to dissipate the heat of the light emitter 5. The TEC refrigerator 11 conducts heat through the TO-tube base 1 by the peltier effect. Note that the peltier effect refers to a phenomenon in which the cold end of the semiconductor refrigerator 11 absorbs heat and the hot end of the semiconductor refrigerator 11 releases heat when a direct current passes through the EC refrigerator 11.

It should be noted that in the present embodiment, the heat sink 12 may be made of metal or ceramic with a surface metallizable thermal conductivity of more than 180W/mk and a thermal expansion coefficient of less than 8 × 10-6 ℃. It should be further noted that, in this embodiment, the heat sink 12 may be made as large as possible on the premise of satisfying the conventional TO package size, so that the heat dissipation efficiency of the light emitter 5 may be improved; meanwhile, the refrigerator 11 is designed TO have a small size of the TO package by designing its size and performance, and can achieve an optimal cooling efficiency and a minimum power consumption.

Referring TO fig. 1 and 2, the TO tube seat 1 is further provided with two pin seats 8, the two pin seats 8 are located in the sealed cavity, the two pin seats 8 are located on two sides of the refrigerator 11 respectively, and the four pins 9 penetrate through the pin seats 8. The refrigerator 11, the light emitter 5, the backlight monitor 6 and the temperature sensor are connected with the pin 9 through gold wires and used for supplying power and transmitting signals to the refrigerator 11, the light emitter 5, the backlight monitor 6 and the temperature sensor.

Referring to fig. 1 and 2, a temperature sensor is further arranged on the heat sink 12, the temperature sensor comprises a thermistor 7, and the thermistor 7 is arranged on the heat sink 12. Specifically, the resistance value of the thermistor 7 changes with the temperature change, and the temperature of the heat sink 12 is monitored. It should be noted that, in this embodiment, the optical transmitter is also connected TO a signal processor when in use, and the input terminal of an external signal processing device is connected TO the thermistor 7 through the lead pin 9, so that the number of components provided in the TO cap 2 is reduced, and the package size of the optical transmitter can be effectively reduced.

It should be noted that, in this embodiment, the optical transmitter is further connected to a TEC driver when in use, and the TEC driver is connected to a TEC refrigerator 11 through a pin 9. And the output end of the external signal processor is connected with the input end of the TEC driver. Preferably, in this embodiment, the TEC driver includes a MAX8520 chip, and the driving current is 1.5A. The output end of the external signal processor is connected with the input end of the MAX8520 chip, and the external signal processor is used for accurately controlling the TEC refrigerator 11 to refrigerate according to the real-time temperature of the heat sink 12, so that the temperature of the working environment of the light emitter 5 is kept at a constant temperature, and the stability of the output wavelength of the light emitter 5 is improved.

Referring to fig. 1 and 2, in order to monitor the forward output power of the optical transmitter 5, the optical transmitter is provided with a backlight monitor 6, and it should be noted that in this embodiment, the backlight monitor 6 is a monitoring photodiode MPD.

Specifically, after the backward light of the light emitter 5 is incident on the monitor photodiode MPD, the monitor photodiode MPD may generate a photocurrent according to the backward light, and the larger the light intensity is, the larger the generated photocurrent is. The forward light-emitting power of the light emitter 5 can be monitored in real time through the magnitude of the photocurrent and the front-to-back light-emitting ratio of the light emitter 5, and the forward light-emitting power of the half light emitter 5 is automatically adjusted through the change of the backward photocurrent.

Referring to fig. 3, it is worth explaining that, in the embodiment of the present invention, the optical transmitter 5 includes a semiconductor laser chip, and a Distributed Bragg Reflector (DBR) is built in the semiconductor laser chip. By utilizing the characteristics of the DBR, the wavelength can be continuously adjusted by changing the magnitude of the current injected into the DBR and adjusting the temperature of the DBR. As can be seen from fig. 3, the chip is mainly divided into an active region 301 (which may also be referred to as an active region), a phase control region 302, and a bragg reflection grating region 303 (which may also be referred to as a DBR region). When the current injected into the DBR section is changed, the concentration of carriers in the DBR section is changed, and the refractive index is also changed, thereby causing a change in the generated center wavelength. Referring to fig. 4, as the DBR current increases, the center wavelength generated by the semiconductor laser chip decreases in a step-like manner, the decreasing step size is about 0.8nm (nanometer), and the change of the current has a large influence on the change of the output wavelength, so the adjustment is called coarse adjustment. Also, as can be seen from fig. 4, the decreasing speed of the output wavelength gradually decreases with an increase in current, and the output wavelength remains substantially constant when the current increases to 20mA (milliamp), so that a wavelength adjustment range of about 10nm can be achieved by changing the current of the DBR section.

The implementation principle of the embodiment is as follows: when the optical transmitter is used, the aspheric lens 3 is used for converging the front-phase light generated by the optical transmitter 5 into a collimation state so as to be coupled into an optical fiber for transmission. The heat sink 12 conducts heat generated by the light emitter 5 during operation to the cold end of the TEC refrigerator 11 for heat exchange, so as to dissipate the heat of the light emitter 5. The TEC refrigerator 11 conducts heat through the TO-tube base 1 by the peltier effect. It should be noted that the peltier effect refers to a phenomenon that when a direct current passes through the TEC refrigerator 11, the cold end of the TEC refrigerator 11 absorbs heat and the hot end of the TEC refrigerator 11 releases heat. Meanwhile, in the working process, the thermistor 7 is used for collecting temperature information of the heat sink 12 and outputting the temperature information to an external signal processor, the temperature information processed by the signal processor is sent to the TEC driver, and the TEC driver accurately controls the TEC refrigerator 11 to refrigerate according to the temperature information and dissipates heat of the light emitter 5, so that the working environment temperature of the light emitter 5 is in a relatively constant temperature. Meanwhile, after the backward light of the light emitter 5 is incident on the monitor photodiode MPD, the monitor photodiode MPD may generate a photocurrent according to the backward light, and the larger the light intensity is, the larger the generated photocurrent is. Through the size of this photocurrent and the light-emitting ratio around the light emitter 5, just can monitor the forward luminous power of light emitter 5 in real time to through the change automatically regulated half light emitter 5's of photocurrent in a reverse direction luminous power that advances, improve the stability of the wavelength of light emitter 5 output.

In the description of the present invention, it should be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Claims

1. A high stability optical transmitter, comprising:

the TO tube seat comprises a TO tube seat (1) and a TO tube cap (2) arranged on the TO tube seat (1), wherein a sealed cavity is formed between the TO tube seat (1) and the TO tube cap (2), a lens (3) is arranged on one side, right facing the TO tube seat (1), of the TO tube cap (2), and the central axis of the TO tube seat (1) is coaxial with the optical axis of the lens (3);

the TO tube seat (1) is provided with a refrigerator (11), the refrigerator (11) is positioned in the sealed cavity, the refrigerator (11) is provided with a heat sink (12), the heat sink (12) is vertical TO the central axis of the TO tube seat (1), the heat sink (12) is provided with a prism (4), a light emitter (5) and a backlight monitor (6), the prism (4) and the backlight tube are respectively positioned at two sides of the light emitter (5), and the lens (3) is positioned right above the prism (4), the light emitter (5) and the backlight monitor (6);

a temperature sensor is also arranged on the heat sink (12);

the TO tube seat (1) is further provided with a pin seat (8), the pin seat (8) is located in the sealed cavity, and a plurality of pins (9) which are respectively used for connecting the refrigerator (11), the light emitter (5), the backlight monitor (6) and the temperature sensor with an external device are arranged on the pin seat (8) in a penetrating mode.

2. A high stability optical transmitter according to claim 1, characterized in that said lens (3) is an aspherical lens (3).

3. A high stability optical transmitter according to claim 1, characterized in that said refrigerator (11) is a TEC refrigerator (11).

4. A high stability optical transmitter according to claim 3, characterized in that said heat sink (12) is arranged on the cold side of the TEC refrigerator (11).

5. A high stability optical transmitter according to claim 1, characterized in that said temperature sensor comprises a thermistor (7), said thermistor (7) being arranged on said heat sink (12).

6. The optical transmitter of any one of claims 1-5, wherein said TO header (1) further comprises two lead bases (8), said two lead bases (8) are located in the sealed cavity, said two lead bases (8) are respectively located at two sides of the refrigerator (11), said lead bases (8) are provided with four leads (9) therethrough.