WO2022142068A1 - O-band tunable optical module - Google Patents

Abstract

The present application discloses an O-band tunable optical module. The O-band tunable optical module comprises: a microprocessor circuit, a select switch and a transmitter optical subassembly (TOSA). The TOSA comprises a plurality of laser devices, and different laser devices respectively cover different wavelength ranges, the microprocessor circuit comprises a select signal port and a current signal port, and the select switch comprises a common port, a control port and a plurality of output ports. The select signal port is connected to the control port, the current signal port is connected to the common port, and the output ports are respectively connected to the corresponding laser devices. The microprocessor circuit is configured to control the common port of the select switch to be selectively connected to a corresponding output port, so as to connect the current signal port to a corresponding laser device; and the microprocessor circuit is configured to input a current signal to the corresponding laser device by means of the current signal port, so as to turn on the corresponding laser device.

Description

An O-band tunable light module

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202110001540.1 and the filing date of January 4, 2021, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is incorporated herein by reference.

technical field

The present application belongs to the field of optical communication, and more particularly, relates to an O-band tunable optical module.

Background technique

At present, the 5G commercial networks of major operators are being constructed on a large scale, and the construction of 5G bearer networks has attracted more and more attention from major operators. As a part of the bearer network, the fronthaul network needs to use a large number of 25G optical modules. At this stage, 25G gray optical modules are mainly used. Division Multiplexer, CWDM) and medium wavelength division multiplexing (Metro Wavelength Division Multiplexing, MWDM) optical modules have also begun to be applied, and LWDM (Lan Wavelength Division Multiplexing, LWDM) optical modules have also entered the sample stage.

The optical modules using the above WDM technology increase the wavelength channel, which can reduce the use of on-site optical fibers, but each module corresponds to one wavelength, and optical modules with multiple wavelengths are required for on-site use, which undoubtedly increases the number and difficulty of spare parts. It also lacks flexibility when used in the field.

Optical modules using tunable laser technology can cover multiple wavelengths, reducing the types of optical modules and simplifying inventory. Since tunable lasers are mainly used in the transmission field, they are mainly C and L bands, but these two bands will bring greater fiber transmission cost and dispersion for 25G, and the transmission distance is also limited.

The use of optical modules with tunable wavelengths in the O-band can solve the above problems. However, due to the large number of base stations in the fronthaul field, it is extremely sensitive to the cost of optical modules. The conventional Dense Wavelength Division Multiplexing (DWDM) technology is limited by its high cost. The large-scale application of tunable light modules in this field.

On the basis of conventional O-band LWDM, two wavelength allocation schemes are planned, one is an 18-wave system with a channel spacing of 800 gigahertz (GHz), see Table 1; the other is a 20-wave system with a channel spacing of 400 GHz. See Table 2.

Table 1 25 gigabits per second (Gb/s) 800GHz channel spacing 18-channel wavelength allocation

Table 2 25Gb/s 400GHz channel spacing 20-channel wavelength allocation

Center wavelength number	Nominal Center Frequency (THz)	Nominal center wavelength (nm)
CH1	236.2	1269.23
CH2	235.8	1271.38
CH3	235.4	1273.54
CH4	235.0	1275.71
CH5	234.6	1277.89
CH6	234.2	1280.07
CH7	233.8	1282.26
CH8	233.4	1284.46
CH9	233.0	1286.66
CH10	232.6	1288.87
CH11	232.2	1291.10
CH12	231.8	1293.32
CH13	231.4	1295.56
CH14	231.0	1297.81
CH15	230.6	1300.05
CH16	230.2	1302.32
CH17	229.8	1304.58
CH18	229.4	1306.86
CH19	229.0	1309.14
CH20	228.6	1311.43

For the 800GHz 18-wave system shown in Table 1, it can cover the current LWDM system, and the compatibility is very good from the perspective of use. However, because the wavelength span is too large, close to 80nm, generally a single laser cannot cover such a wide wavelength range, so other methods must be used to eliminate this deficiency.

In view of this, overcoming the defects of the related art is an urgent problem to be solved in the technical field.

SUMMARY OF THE INVENTION

In view of the above defects or improvement requirements of the related art, an embodiment of the present application provides an O-band tunable optical module, where the O-band tunable optical module includes: a microprocessor circuit, a routing switch, and an optical emission sub-module (Transmitter Optical Subassembly, TOSA), wherein, the TOSA includes a plurality of lasers, and different lasers cover different wavelength ranges respectively;

The microprocessor circuit includes a routing signal port and a current signal port, the routing switch includes a common port, a control port and a plurality of output ports; the routing signal port is connected with the control port, and the current signal The ports are connected with the common ports, and the output ports are respectively connected with the corresponding lasers;

The microprocessor circuit is configured to control the common port of the routing switch to selectively connect with the corresponding output port, and then connect the current signal port with the corresponding laser;

The microprocessor circuit is configured to input a current signal to the corresponding laser through the current signal port to turn on the corresponding laser.

In the above solution, the TOSA includes a first laser LD1 and a second laser LD2, wherein the first laser LD1 and the second laser LD2 cover different wavelength ranges respectively;

The routing switch includes a first output port and a second output port, the first output port is connected with the first laser LD1, and the second output port is connected with the second laser LD2;

The microprocessor circuit is configured to control the common port of the routing switch to selectively connect with the first output port or the second output port, and then connect the current signal port with the first laser LD1 or the first output port. The second laser LD2 is connected;

The microprocessor circuit is configured to input a current signal to the first laser LD1 or the second laser LD2 through the current signal port to turn on the first laser LD1 or the second laser LD2.

In the above solution, the O-band dimmable optical module further includes a gold finger connector, and the I2C port of the gold finger connector is connected to the microprocessor circuit;

The microprocessor circuit is configured to receive the wavelength configuration instruction through the gold finger connector, and determine the wavelength range interval in which the wavelength is located, and determine the laser matching the wavelength according to the wavelength range interval, so as to pass the selection method. The path signal port inputs the corresponding path selection signal to the path selection switch, controls the common terminal of the path selection switch to selectively connect to the first output port or the second output port, and then connects the current signal port to the The first laser LD1 or the second laser LD2 is connected.

In the above solution, the O-band dimmable optical module further includes a driver, the driver is connected to the TD+ port and the TD- port of the golden finger connector, and the driver is also connected to the microprocessor circuit and the TOSA connection;

The microprocessor circuit is configured to receive a control signal through the golden finger connector, and drive the driver according to the control signal.

In the above solution, the O-band tunable light module further includes a semiconductor refrigerator (Thermo Electric Cooler, TEC), one end of the TEC is connected to the microprocessor circuit, and the other end of the TEC is connected to the TOSA ;

The TEC is configured to regulate the die temperature of the TOSA.

In the above solution, the O-band tunable optical module further includes a limiting amplifier, the limiting amplifier is connected to the RD+ port and the RD- port of the golden finger connector, and the limiting amplifier is also connected to the microprocessor. circuit connection;

The microprocessor circuit is configured to receive a control signal through the golden finger connector, and control the limiting amplifier according to the control signal.

In the above solution, the O-band tunable optical module further includes an optical receiving sub-module (Receiver Optical Subassembly, ROSA), and the ROSA is connected to the limiting amplifier.

In the above solution, the ROSA is a 25G avalanche photodiode light receiving assembly (Avalanche Photon DiodeReceiver Optical Subassembly, APD ROSA).

In the above solution, the O-band dimmable optical module further includes a bias circuit, one end of the bias circuit is connected to the microprocessor circuit, and the other end of the bias circuit is connected to the ROSA.

In the above solution, the TOSA is a 25G tunable TOSA (also referred to as a tunable optical emission component).

In general, compared with the related technologies, the above technical solutions conceived by the embodiments of the present application have the following beneficial effects: The embodiments of the present application provide an O-band tunable optical module, and the O-band tunable optical module includes: A microprocessor circuit, a routing switch, and a TOSA, wherein the TOSA includes a plurality of lasers, and different lasers cover different wavelength ranges respectively; the microprocessor circuit includes a routing signal port and a current signal port, and the routing The switch includes a common port, a control port and a plurality of output ports; the routing signal port is connected with the control port, the current signal port is connected with the common port, and the output ports are respectively connected with the corresponding lasers The microprocessor circuit is configured to control the common port of the routing switch to selectively connect with the corresponding output port, and then connect the current signal port with the corresponding laser; the microprocessor circuit It is configured to input a current signal to the corresponding laser through the current signal port to turn on the corresponding laser.

In the embodiment of the present application, the O-band coverage of a single adjustable optical module can be improved without increasing the types of optical modules, which has high flexibility and can solve the 18-wave system at 800 GHz. It is a technical problem that a single laser cannot cover such a wide wavelength range. In addition, the use of 800GHz channel spacing can reduce the difficulty of implementing dimmable optical modules, reduce the cost of use through large-scale application, and facilitate operators to operate and maintain 5G networks.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the drawings that need to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of an O-band tunable optical module provided by an embodiment of the present application;

2 is a schematic structural diagram of another O-band tunable optical module provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another O-band tunable optical module provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the terms "inner", "outer", "longitudinal", "horizontal", "upper", "lower", "top", "bottom", etc. is based on The orientation or positional relationship shown in the drawings is only for the convenience of describing the present application, rather than requiring the present application to be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no conflict with each other.

Example 1:

For the 800GHz 18-wave system shown in Table 1, because the wavelength span is too large, close to 80nm, generally a single laser cannot cover such a wide wavelength range. This embodiment provides an O-band tunable optical module, which can be used in different In the case of increasing the types of optical modules, the O-band coverage of a single dimmable optical module is improved, which has high flexibility. In addition, the use of 800GHz channel spacing can reduce the difficulty of implementing dimmable optical modules, reduce the cost of use through large-scale application, and facilitate operators to operate and maintain 5G networks.

Referring to FIG. 1 , the O-band tunable optical module in this embodiment includes: a microprocessor circuit, a routing switch, and a TOSA, wherein the TOSA includes a plurality of lasers, and different lasers cover different wavelength ranges respectively; the microprocessor circuit The controller circuit includes a routing signal port and a current signal port, the routing switch includes a common port, a control port and a plurality of output ports; the routing signal port is connected to the control port, and the current signal port is connected to the The output ports are connected to the corresponding lasers respectively; the microprocessor circuit is configured to control the common ports of the routing switches to be selectively connected to the corresponding output ports, thereby connecting the current to the corresponding output ports. The signal port is connected with the corresponding laser; the microprocessor circuit is configured to input a current signal to the corresponding laser through the current signal port to turn on the corresponding laser.

Wherein, the TOSA is 25G Tunable TOSA. The number of lasers (LD1˜LDn in FIG. 1 ) included in the TOSA matches the output ports (output port 1˜output port n in FIG. 1 ) of the routing switch.

In a practical application scenario, further referring to FIG. 2, the TOSA includes a first laser LD1 and a second laser LD2, wherein the first laser LD1 and the second laser LD2 cover different wavelength ranges respectively; the routing The switch includes a first output port and a second output port, the first output port is connected with the first laser LD1, and the second output port is connected with the second laser LD2.

In actual use, the microprocessor circuit is configured to control the common port of the routing switch to selectively connect with the first output port or the second output port, and then connect the current signal port with the The first laser LD1 or the second laser LD2 is connected; the microprocessor circuit is configured to input a current signal to the first laser LD1 or the second laser LD2 through the current signal port to turn on the first laser LD1 or The second laser LD2.

Further, the O-band tunable optical module further includes a golden finger connector, and the I2C port of the golden finger connector is connected with the microprocessor circuit; the microprocessor circuit is configured to be connected through the golden finger The receiver receives the wavelength configuration instruction, judges the wavelength range interval in which the wavelength is located, and determines the laser matching the wavelength according to the wavelength range interval, so as to input the corresponding routing switch to the routing switch through the routing signal port. control the common terminal of the routing switch to selectively connect with the first output port or the second output port, and then connect the current signal port with the first laser LD1 or the second laser LD2.

In this embodiment, the TOSA includes a plurality of lasers with different wavelength coverage. According to the actual wavelength requirements, the current signal output by the microprocessor circuit is selectively input to one of the lasers in the TOSA through the routing switch. For example, the O-band dimmable optical module can improve the O-band coverage of a single dimmable optical module without increasing the types of optical modules, and has high flexibility. In addition, the use of 800GHz channel spacing can reduce the difficulty of implementing dimmable optical modules, reduce the cost of use through large-scale application, and facilitate operators to operate and maintain 5G networks.

Example 2:

The structure of the O-band tunable optical module will be specifically described below with reference to FIG. 3 . As shown in FIG. 3 , the O-band dimmable optical module further includes a driver, and the driver is connected to the TD+ port and the TD- port of the golden finger connector, wherein the TD+ port and the TD- port are a signal sending port, the driver is also connected to the microprocessor circuit and the TOSA respectively; the microprocessor circuit is configured to receive a control signal through the golden finger connector, and drive the driver according to the control signal .

The O-band tunable optical module further includes a TEC, one end of the TEC is connected to the microprocessor circuit, and the other end of the TEC is connected to the TOSA; the TEC is configured to adjust the TOSA die temperature.

Wherein, the O-band tunable optical module further includes a limiting amplifier, and the limiting amplifier is connected to the RD+ port and the RD- port of the golden finger connector, wherein the RD+ port and the RD- port are signal receiving ports; The limiting amplifier is also connected with the microprocessor circuit; the microprocessor circuit is configured to receive a control signal through the golden finger connector, and control the limiting amplifier according to the control signal, and the limiting amplifier The amplifier is configured to limit the signal.

Further, the O-band tunable optical module further includes a ROSA, the ROSA is connected to the limiting amplifier, and the ROSA is a 25G APD ROSA. The O-band dimmable light module further includes a bias circuit, one end of the bias circuit is connected to the microprocessor circuit, the other end of the bias circuit is connected to the ROSA, and the bias circuit is configured To provide a suitable bias voltage to the ROSA. The bias circuit is a high voltage bias circuit.

In this embodiment, the control port I2C of the golden finger connector is connected to the microprocessor circuit, and is configured to transmit configuration instructions, working states and working parameters of each module; the microprocessor circuit is respectively connected to the limiter circuit. Amplifier, bias circuit, routing switch, TEC, driver; the golden finger connector transmits a control signal to the microprocessor circuit, and the microprocessor circuit respectively controls the amplitude limiting according to the control signal Working parameters and working states of amplifiers, bias circuits, selector switches, TECs, and drivers.

In addition, the multi-channel current required by TOSA can be generated by the current digital-to-analog converter (IDAC) circuit of the microprocessor circuit, and the multi-channel current generated by the IDAC is input to the routing switch; the microprocessor circuit judges the required wavelength configuration, Control the routing switch, so that the multi-channel current is output to the laser LD1 or LD2 in the TOSA to complete the wavelength range selection.

In this embodiment, an O-band dimmable optical module is provided. The O-band dimmable optical module includes a gold finger connector, a microprocessor circuit, a limiting amplifier, a ROSA, a bias circuit, a routing switch, a TEC , drives, and TOSA. The microprocessor circuit receives the wavelength configuration command sent by the host (HOST) through the gold finger connector, determines the wavelength range of the wavelength, and controls the routing switch to apply current to the first laser LD1 or the second laser LD2 in the TOSA . The first laser LD1 and the second laser LD2 respectively cover different wavelength ranges, and the wavelength range can be expanded by turning on the first laser LD1 or the second laser LD2, so that a single module can cover a larger wavelength range. Of course, in a practical application scenario, if the wavelength range of the first laser LD1 or the second laser LD2 can cover the required number of channels, a single laser can also be used to complete the required wavelength range.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application, etc., All should be included within the protection scope of this application.

Claims (10)

1. An O-band tunable optical module, the O-band tunable optical module includes: a microprocessor circuit, a routing switch, and an optical emission sub-module TOSA, wherein the TOSA includes a plurality of lasers, and different lasers respectively cover different wavelengths scope;

   The microprocessor circuit includes a routing signal port and a current signal port, the routing switch includes a common port, a control port and a plurality of output ports; the routing signal port is connected with the control port, and the current signal The ports are connected with the common ports, and the output ports are respectively connected with the corresponding lasers;

   The microprocessor circuit is configured to control the common port of the routing switch to selectively connect with the corresponding output port, and then connect the current signal port with the corresponding laser;

   The microprocessor circuit is configured to input a current signal to the corresponding laser through the current signal port to turn on the corresponding laser.
2. The O-band tunable optical module according to claim 1, wherein the TOSA comprises a first laser LD1 and a second laser LD2, wherein the first laser LD1 and the second laser LD2 respectively cover different wavelengths scope;

   The routing switch includes a first output port and a second output port, the first output port is connected with the first laser LD1, and the second output port is connected with the second laser LD2;

   The microprocessor circuit is configured to control the common port of the routing switch to selectively connect with the first output port or the second output port, and then connect the current signal port with the first laser LD1 or the first output port. The second laser LD2 is connected;

   The microprocessor circuit is configured to input a current signal to the first laser LD1 or the second laser LD2 through the current signal port to turn on the first laser LD1 or the second laser LD2.
3. The O-band dimmable optical module according to claim 2, wherein the O-band dimmable optical module further comprises a gold finger connector, and the I2C port of the gold finger connector is connected to the microprocessor circuit;

   The microprocessor circuit is configured to receive the wavelength configuration instruction through the gold finger connector, and determine the wavelength range interval in which the wavelength is located, and determine the laser matching the wavelength according to the wavelength range interval, so as to pass the selection method. The path signal port inputs the corresponding path selection signal to the path selection switch, controls the common terminal of the path selection switch to selectively connect to the first output port or the second output port, and then connects the current signal port to the The first laser LD1 or the second laser LD2 is connected.
4. The O-band dimmable optical module according to claim 3, wherein the O-band dimmable optical module further comprises a driver, the driver is connected to the TD+ port and the TD- port of the gold finger connector, and the driver Also connected with the microprocessor circuit and the TOSA respectively;

   The microprocessor circuit is configured to receive a control signal through the golden finger connector, and drive the driver according to the control signal.
5. The O-band tunable light module according to claim 3, wherein the O-band tunable light module further comprises a semiconductor refrigerator TEC, one end of the TEC is connected to the microprocessor circuit, and the other end of the TEC is connected to the microprocessor circuit. One end is connected with the TOSA;

   The TEC is configured to regulate the die temperature of the TOSA.
6. The O-band tunable optical module according to claim 3, wherein the O-band tunable optical module further comprises a limiting amplifier, and the limiting amplifier is connected to the RD+ port and the RD- port of the golden finger connector , the limiting amplifier is also connected with the microprocessor circuit;

   The microprocessor circuit is configured to receive a control signal through the golden finger connector, and control the limiting amplifier according to the control signal.
7. The O-band tunable optical module according to claim 6, wherein the O-band tunable optical module further comprises a light receiving sub-module ROSA, and the ROSA is connected to the limiting amplifier.
8. The O-band tunable optical module according to claim 7, wherein the ROSA is a 25G avalanche photodiode light receiving component APD ROSA.
9. The O-band dimmable optical module according to claim 7, wherein the O-band dimmable optical module further comprises a bias circuit, one end of the bias circuit is connected to the microprocessor circuit, and the bias circuit is connected to the microprocessor circuit. The other end of the circuit is connected to the ROSA.
10. The O-band tunable optical module according to any one of claims 1 to 9, wherein the TOSA is a 25G tunable emission optical component Tunable TOSA.

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