CN113285347A

CN113285347A - Wavelength-selective laser integrated with polarization controller and processing method thereof

Info

Publication number: CN113285347A
Application number: CN202110542404.3A
Authority: CN
Inventors: 石元; 高星
Original assignee: Shaanxi Aowei Laser Technology Co ltd
Current assignee: Shaanxi Aowei Laser Technology Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-08-20

Abstract

A wavelength-selective laser of an integrated polarization controller and a processing method thereof, the laser comprises a tube shell with a closed inner cavity, and an LD power-up module, a first lens, an isolator, a polarization plate group and a collimator which are arranged in the inner cavity of the tube shell along a light path in sequence, wherein the collimator consists of a second lens and a tail fiber; the LD power-up module comprises a DFB chip, a laser signal sent by the LD power-up module can be converted into parallel light rays through a first lens, a second lens can converge the parallel light rays to a tail fiber of the collimator, and the collimator outputs the collimated laser signal through the tail fiber; the outside of tube shell is provided with the pin, and the LD adds electric module and is connected with the pin, and the polaroid group comprises a plurality of polaroids, controls the polarization state of output light through the rotation of polaroid. The processing method can be completed by adopting a full-automatic chip mounter. The invention can change the output light into any polarization state through the rotation of the polaroid and can realize the wavelength selection in the full wave band range.

Description

Wavelength-selective laser integrated with polarization controller and processing method thereof

Technical Field

The invention belongs to the field of lasers, and particularly relates to a wavelength-selective laser integrated with a polarization controller and a processing method thereof.

Background

With the rapid development of big data, internet of things and 5G services, the demand for network capacity is increasing, which makes the coherent optical communication technology with large bandwidth and long-distance transmission the first choice of the next generation of high-speed large-capacity optical network, and as a high-coherence light source, a narrow-linewidth wavelength selectable laser becomes one of the core devices of coherent optical communication.

The existing 14PIN butterfly laser is a specific wavelength output laser, and the inside of the laser also needs to be integrated with elements matched with the laser, and the laser mainly comprises two parts: a butterfly housing and a collimated output; the butterfly shell is internally provided with a temperature control part consisting of a thermistor and a thermoelectric cooler (TEC) and an LD power-up part consisting of a DFB chip, a matching resistor and a winding inductor, wherein the collimation output mainly adopts an optical isolator, and C-LENS couples the light output from the shell pipe orifice to a tail fiber for output. However, it is difficult for such a specific output wavelength laser to meet the requirements of miniaturization and integration development of related upstream instruments and equipment.

Disclosure of Invention

The present invention is directed to solve the problem of single output wavelength of the 14PIN butterfly laser in the prior art, and provides a wavelength-selective laser integrated with a polarization controller and a processing method thereof, wherein the wavelength-selective laser has a wide selection range and high output power.

In order to achieve the purpose, the invention has the following technical scheme:

a wavelength-selective laser integrated with a polarization controller comprises a tube shell with a closed inner cavity, and an LD (laser diode) power-up module, a first lens, an isolator, a polarizer group and a collimator which are sequentially arranged in the inner cavity of the tube shell along a light path, wherein the collimator consists of a second lens and a tail fiber; the laser signal emitted by the LD power-up module can be converted into parallel light rays through the first lens, the parallel light rays can be converged to the tail fiber of the collimator through the second lens, and the collimator outputs the collimated laser signal through the tail fiber; the external of the tube shell is provided with a pin, the LD power-up module is connected with the pin, the polarizer group consists of a plurality of polarizers, and the polarization state of output light is controlled by the rotation of the polarizers.

As a preferred embodiment of the present invention, the tube housing is further provided with a temperature control module, the temperature control module includes a thermistor and a thermoelectric refrigerator, two ends of the thermistor and the thermoelectric refrigerator are respectively connected to different pins, and the power-up direction of the thermistor and the thermoelectric refrigerator is changed through the pins.

In a preferred embodiment of the present invention, the DFB chip is fixed on an LD substrate, the LD substrate is a 32D substrate, and the LD substrate, the first lens, the isolator, the polarizer group, the second lens, and the collimator are fixed on a 79C substrate.

As a preferable mode of the present invention, the polarizer group includes three polarizers sequentially disposed along the optical path, and the three polarizers change angles according to polarization states.

As a preferred embodiment of the present invention, there are 14 pins, and the functions of each pin are as follows:

numbering	Pin definition
			1	Positive pole of refrigerator
2	Negative pole of refrigerator
		3	LD direct current cathode
4	Thermistor anode
		5	Negative pole of thermistor
6	Hollow foot
		7	First polarizer polarization control
8	Second polarizer polarization control
		9	Third polarizer polarization control
10	Hollow foot
		11	LD anode + ground
12	LD radio frequency drive
		13	LD anode + ground
14	LD anode + ground

As a preferred scheme of the present invention, the LD power-up module further includes a matching resistor, a diode, and a winding inductor, the matching resistor is connected in parallel with the diode and then connected to one end of the winding inductor, the other end of the winding inductor is connected to pin 3, the other end of the matching resistor is connected to pin 12, and the anodes of the diodes are respectively connected to

pins

11, 12, 13, and 14; the positive pole of the DFB chip is connected with the 11 th pin, and the negative pole is connected with the 3 rd pin.

In a preferred embodiment of the present invention, the collimator further includes a glass tube, and the second lens and the pigtail are fixed in the glass tube.

The invention also provides a processing method of the wavelength-selective laser of the integrated polarization controller, which comprises the following steps:

1) fixing the DFB chip with the characteristics meeting the requirements on the LD substrate and welding the DFB chip with the pins on the LD substrate;

2) mounting the DFB chip fixed on the LD substrate on a 79C substrate and welding and fixing;

3) mounting and fixing the first lens, the isolator and the second lens on a 79C substrate;

4) mounting a polarizer set on a 79C substrate;

5) fixing and conducting the thermoelectric refrigerator and the tube shell;

6) leading the tail fiber of the collimator out of the tube shell;

7) and performing wire welding operation in the tube shell according to the pin definition, and performing head adding treatment on the tail fiber to finish packaging.

As a preferred scheme of the invention, the LD substrate is a 32D substrate, the DFB chip (2) is stuck and fixed on the 32D substrate in the step 1) and is baked for 1000s at 25 ℃ and tested, and the characteristics are kept to meet the requirements;

and 3) mounting the first lens and the second lens in a U-shaped groove of a 79C substrate, fixing by gluing, firstly baking for 10 minutes by using UV (ultraviolet), and then baking for 1 hour in an oven at 110 ℃.

As a preferable scheme of the invention, the step 5) puts the thermoelectric refrigerator into the tube shell, bakes the thermoelectric refrigerator on a hot plate at 190 ℃ for 5 minutes, and tests whether the thermoelectric refrigerator is conducted with the tube shell after cooling;

and 6) uniformly coating the soldering flux on a thermoelectric refrigerator, placing a finished product formed by assembling the tail fiber and the tube shell of the collimator on a baking tray at about 135 ℃ for heating for 4 minutes, and cooling and taking down the soldering flux after the soldering flux is molten.

Compared with the prior art, the wavelength selection laser integrated with the polarization controller has the following beneficial effects: the inner cavity of the tube shell is provided with a polarizer group consisting of a plurality of polarizers, and finally output light can be changed into any polarization state through the rotation of the polarizers. The DFB chip can select the corresponding wave band to realize the wavelength required by the user. The invention can realize the laser with selectable wavelength, the selection range is full wave band, and the application range is wide. The whole structure is realized by a tube shell packaging LD power-up module, a first lens, an isolator, a polarizer group and a collimator, and has the advantages of miniaturization and integration.

Furthermore, the tube shell of the invention is also provided with a temperature control module, the temperature control module comprises a thermistor and a thermoelectric refrigerator, and when the laser of the invention is used and the external temperature influence occurs, the temperature of the product of the invention is higher than 25 ℃, the temperature control module is put into operation, so that the temperature of the product can be always maintained at room temperature.

Compared with the prior art, the processing method of the wavelength-selective laser integrated with the polarization controller has the following beneficial effects: the LD substrate and the 79C substrate are adopted for mounting and fixing, the process can be completed by means of a full-automatic chip mounter, the overall processing efficiency is high, the processing quality is reliable and stable, and therefore the service performance of the laser is guaranteed.

Drawings

FIG. 1 is a schematic diagram of an external structure of a laser according to the present invention;

FIG. 2 is a schematic view of a housing portion of the laser of the present invention;

FIG. 3 is a coupling schematic of the laser of the present invention;

FIG. 4 is a schematic diagram of a circuit structure and a lead of the laser according to the present invention;

in the drawings:

1-a pipe shell; 2-DFB chip; 3-a first lens; 4-an isolator; 5-a set of polarizers; 6-a second lens; 7-collimator.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Referring to fig. 1 to 3, the present invention provides a wavelength-selective laser integrated with a polarization controller, including:

the device comprises a tube shell 1 with a closed inner cavity, and an LD power-up module, a first lens 3, an isolator 4, a polarizer group 5 and a collimator 7 which are sequentially arranged in the inner cavity of the tube shell 1 along an optical path, wherein the collimator 7 consists of a second lens 6 and a tail fiber. The LD power-up module comprises a DFB chip 2, a laser signal sent by the LD power-up module can be converted into parallel light rays through a first lens 3, a second lens 6 can converge the parallel light rays to a tail fiber of a collimator 7, and the collimator 7 outputs the collimated laser signal through the tail fiber; the collimator 7 further comprises a glass tube, and the second lens 6 and the tail fiber are arranged in the glass tube and fixed. The DFB chip 2 is fixed on an LD substrate, which is a 32D substrate, and the LD substrate, the first lens 3, the isolator 4, the polarizer group 5, the second lens 6, and the collimator 7 are fixed on a 79C substrate. The outside of the tube shell 1 is provided with a pin, the LD power-up module is connected with the pin, the polarizer group 5 is composed of a plurality of polarizers, and the polarization state of output light is controlled through the rotation of the polarizers. In the embodiment, the polarizer group 5 includes three polarizers sequentially disposed along the optical path, and the three polarizers change the angle according to the polarization state. The tube shell 1 is also provided with a temperature control module, the temperature control module comprises a thermistor and a thermoelectric refrigerator, two ends of the thermistor and the thermoelectric refrigerator are respectively connected with different pins, and the power-on directions of the thermistor and the thermoelectric refrigerator are changed through the pins.

The first lens 3 in the embodiment employs a collimator lens, and the second lens 6 employs a focusing lens.

Referring to fig. 4, the laser of the present invention in an embodiment has 14 pins, and the functions of the pins are as follows:

The LD power-up module further comprises a matching resistor, a diode and a winding inductor, wherein the matching resistor is connected with one end of the winding inductor after being connected with the diode in parallel, the other end of the winding inductor is connected with the pin 3, the other end of the matching resistor is connected with the pin 12, and the anodes of the diodes are respectively connected with the

pins

11, 12, 13 and 14. The positive electrode of the DFB chip 2 is connected to the pin 11, and the negative electrode thereof is connected to the pin 3.

A method of fabricating a wavelength selective laser with integrated polarization controller, comprising the steps of:

a. firstly, testing the DFB chip 2, wherein the main testing characteristics comprise central wavelength, output power and the like;

b. sticking the DFB chip 2 on a 32D substrate, baking for 1000s at 25 ℃, and testing;

c. welding one pin of the DFB chip 2 and the 32D substrate;

d. mounting the DFB chip 2 fixed on the 32D substrate on a corresponding 79C substrate, and fixing by adopting solder;

e. coupling a lens and an isolator 4, fixing the lens in a U-shaped groove, placing the lens and the isolator 4 on the DFB chip 2, fixing the lens and the isolator on a 79C substrate by adopting glue, baking the substrate for 10 minutes by adopting UV (ultraviolet), and then baking the substrate for 1 hour in an oven at 110 ℃;

f. assembling the three polarizing plates, placing the three polarizing plates behind the isolator 4, and fixing the three polarizing plates on a 79C substrate;

g. checking whether the tail fiber power of the collimator 7 is qualified or not, and checking whether the TEC chip is conducted or not;

h. preparing a pretreated tube shell and a TEC semiconductor refrigerating sheet, putting the TEC into the tube shell 1, baking the TEC on a hot plate at 190 ℃ for 5 minutes, taking down the tube shell 1 by using tweezers, and testing whether the TEC is conducted with the tube shell 1 after cooling;

i. uniformly coating the soldering flux on the TEC, penetrating the tail fiber of the collimator 7 out of the hole on the tube shell 1 to enable the tail fiber of the collimator 7 to be positioned in the center of the tube shell hole, placing the assembled finished product on a baking tray at about 135 ℃ for heating for 4 minutes, and cooling and taking down the soldering flux after the soldering flux is melted;

j. and performing wire welding operation in the tube shell 1 on the fixed assembly according to the pin definition, baking, capping, and finally performing heading processing on the tail fiber to finish the finished package of the wavelength-selective laser.

The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and it should be understood by those skilled in the art that the technical solution can be modified and replaced by a plurality of simple modifications and replacements without departing from the spirit and principle of the present invention, and the modifications and replacements also fall into the protection scope of the claims.

Claims

1. A wavelength selective laser integrated with a polarization controller, comprising: the device comprises a tube shell (1) with a closed inner cavity, and an LD (laser diode) electrifying module, a first lens (3), an isolator (4), a polarizer group (5) and a collimator (7) which are sequentially arranged in the inner cavity of the tube shell (1) along a light path, wherein the collimator (7) consists of a second lens (6) and a tail fiber; the LD power-up module comprises a DFB chip (2), a laser signal emitted by the LD power-up module can be converted into parallel light rays through a first lens (3), a second lens (6) can converge the parallel light rays to a tail fiber of a collimator (7), and the collimator (7) outputs the collimated laser signal through the tail fiber; pins are arranged outside the tube shell (1), the LD power-up module is connected with the pins, the polarizer group (5) is composed of a plurality of polarizers, and the polarization state of output light is controlled through the rotation of the polarizers.

2. The integrated polarization controller wavelength-selective laser of claim 1, wherein: the temperature control module is arranged on the tube shell (1) and comprises a thermistor and a thermoelectric refrigerator, two ends of the thermistor and the thermoelectric refrigerator are respectively connected with different pins, and the power-on directions of the thermistor and the thermoelectric refrigerator are changed through the pins.

3. The integrated polarization controller wavelength-selective laser of claim 1, wherein: the DFB chip (2) is fixed on the LD substrate, the LD substrate is a 32D substrate, and the LD substrate, the first lens (3), the isolator (4), the polarizer group (5), the second lens (6) and the collimator (7) are fixed on a 79C substrate.

4. The integrated polarization controller wavelength-selective laser of claim 1, wherein: the polarizer group (5) comprises three polarizers which are sequentially arranged along a light path, and the angles of the three polarizers are changed according to the polarization state.

5. The integrated polarization controller wavelength-selective laser of claim 4, wherein:

the number of the pins is 14, and the functions of the pins are as follows:

6. the integrated polarization controller wavelength-selective laser of claim 5, wherein: the LD power-up module further comprises a matching resistor, a diode and a winding inductor, wherein the matching resistor is connected with one end of the winding inductor after being connected with the diode in parallel, the other end of the winding inductor is connected with a No. 3 pin, the other end of the matching resistor is connected with a No. 12 pin, and the anodes of the diodes are respectively connected with No. 11, No. 12, No. 13 and No. 14 pins; the positive electrode of the DFB chip (2) is connected with the 11 th pin, and the negative electrode of the DFB chip is connected with the 3 rd pin.

7. The integrated polarization controller wavelength-selective laser of claim 1, wherein: the collimator (7) also comprises a glass tube, and the second lens (6) and the tail fiber are arranged in the glass tube and fixed.

8. A method of fabricating an integrated polarization controller wavelength selective laser according to any of claims 1 to 7, comprising the steps of:

1) fixing a DFB chip (2) with the characteristics meeting the requirements on an LD substrate and welding the DFB chip with pins on the LD substrate;

2) mounting a DFB chip (2) fixed on the LD substrate on a 79C substrate and welding and fixing;

3) the first lens (3), the isolator (4) and the second lens (6) are installed on a 79C substrate and fixed;

4) mounting a polarizer group (5) on a 79C substrate;

5) fixing and conducting the thermoelectric refrigerator and the tube shell (1);

6) leading the tail fiber of the collimator (7) out of the tube shell (1);

7) and (3) performing wire welding operation in the tube shell (1) according to the pin definition, and performing head adding treatment on the tail fiber to finish packaging.

9. The process of claim 8, wherein: the LD substrate is a 32D substrate, the DFB chip (2) is stuck and fixed on the 32D substrate in the step 1) and is baked for 1000s at the temperature of 25 ℃, and the test is carried out, so that the characteristic is kept to meet the requirement;

and 3) mounting the first lens (3) and the second lens (6) in a U-shaped groove of a 79C substrate, fixing by adopting glue, firstly baking for 10 minutes by using UV (ultraviolet), and then baking for 1 hour in an oven at 110 ℃.

10. The process of claim 8, wherein: step 5), putting the thermoelectric refrigerator into the tube shell (1), baking the thermoelectric refrigerator on a hot plate at 190 ℃ for 5 minutes, and testing whether the thermoelectric refrigerator is conducted with the tube shell (1) after cooling;

and 6) uniformly coating the soldering flux on a thermoelectric refrigerator, placing a finished product formed by assembling the tail fiber of the collimator (7) and the tube shell (1) on a baking tray at about 135 ℃ for heating for 4 minutes, and cooling and taking down the soldering flux after the soldering flux is molten.