WO2021196686A1

WO2021196686A1 - Photoelectric modulation chip, optical assembly, optical module, and optical network device

Info

Publication number: WO2021196686A1
Application number: PCT/CN2020/133040
Authority: WO
Inventors: 程远兵; 董英华
Original assignee: 华为技术有限公司
Priority date: 2020-03-31
Filing date: 2020-12-01
Publication date: 2021-10-07
Also published as: CN111474801A; CN111474801B

Abstract

Disclosed in the embodiments of the present application is a photoelectric modulation chip. In the embodiments of the present application, the photoelectric modulation chip comprises a light splitting and combining unit, a phase adjustment unit, and a light modulation unit; the light modulation unit comprises a modulator; a first branch of the light splitting and combining unit is connected to the phase adjustment unit, and a second branch of the light splitting and combining unit is connected to the light modulation unit; when the modulator is in a first state, a fourth light signal and a fifth light signal are cancelled when being combined by the light splitting and combining unit, so as to obtain a sixth light signal; and when the modulator is in a second state, the fourth light signal and the fifth light signal are coherently added when being combined by the light splitting and combining unit, so as to obtain the sixth light signal.

Description

Optoelectronic modulation chips, optical components, optical modules and optical network equipment

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China, the application number is 202010249453.3, and the invention title is "Optical Modulation Chips, Optical Components, Optical Modules and Optical Network Equipment" on March 31, 2020, and its entire contents Incorporated in this application by reference.

Technical field

This application relates to the field of optics, in particular to a photoelectric modulation chip, an optical component, an optical module, and an optical network device.

Background technique

Photoelectric modulators with high extinction ratio and low driving voltage have important application prospects in high-speed PON and data centers. For example, a photoelectric modulator with high extinction ratio and low driving voltage can be used to improve the receiving sensitivity of the communication link and increase the transmission distance; at the same time, CMOS driving voltage can be used to drive the photoelectric modulator, which greatly reduces the power consumption of the optical module and improves The integration of light sources reduces costs. At present, in code division multiple access passive optical network (CDMA-PON), time and wavelength division multiplexing passive optical network (time and wavelength division multiplex passive optical network, TWDM-PON), cloud In wireless access networks or 5G networks, reflective modulators are widely used.

At present, a double-ended coupling reflective modulator structure is adopted, and the modulator includes a 1*2 optical coupler or a 2*2 optical coupler and a modulator. The two output waveguides of the coupler are connected to both ends of the modulator. As shown in Figure 1, the input light is coupled into the coupler by the input waveguide on the left side of the coupler, and bidirectionally coupled into the modulator by the two output waveguides on the right side of the coupler; and then transmitted in opposite directions and returned to the coupler, and then combined by the coupler. The waveguide output is output on the left. For a 1*2 optical coupler, the input waveguide on the left side of the coupler is also the output waveguide on the right side of the coupler; for a 2*2 optical coupler, the input waveguide on the left side of the coupler and the output waveguide on the right side of the coupler are separate Of two waveguides.

From the above scheme, it can be seen that since the optical paths coupled into the modulator at both ends are always the same, the light coupled into the modulator in two directions always maintains coherent enhancement, which is equivalent to doubling the effective length of the modulator, which can reduce the equivalent. Extinction ratio required driving voltage. However, the requirements of the CMOS driving voltage driving modulator cannot be met, that is, the above-mentioned solutions cannot meet the requirements of high extinction ratio and realizing the CMOS driving voltage driving modulator at the same time.

Summary of the invention

The first aspect of the embodiments of the present application provides a light modulation chip. The light modulation chip includes a light splitting and combining unit, a phase adjusting unit, and a light modulation unit. The light modulation unit includes a modulator, and a first branch of the light splitting and combining unit is connected to the The phase adjustment unit is connected, and the second branch of the light splitting and combining unit is connected with the light modulation unit; the light splitting and combining unit is used to split the input first optical signal to obtain the second optical signal and the third optical signal; The phase adjustment unit is used to adjust the phase of the second optical signal transmitted by the first branch of the light splitting and combining unit, reflect the second optical signal obtained by the phase adjustment, and then perform phase adjustment again on the second optical signal obtained by the reflection , Obtain the fourth optical signal; the optical modulation unit is used to modulate the third optical signal transmitted by the second branch of the light-splitting and combining unit, and reflect the modulated third optical signal, and then reflect the third optical signal obtained by the reflection The optical signal is modulated again to obtain the fifth optical signal; the light splitting and combining unit is used to combine the fourth optical signal and the fifth optical signal, and output the combined optical signal, where, when the modulator is in the first In the first state, the fourth optical signal and the fifth optical signal cancel each other when they are combined by the light splitting and combining unit to obtain the sixth optical signal. When the modulator is in the second state, the fourth optical signal and the first optical signal are The five optical signals undergo coherent addition when they are combined by the light splitting and combining unit to obtain the sixth optical signal.

In this embodiment, the third optical signal obtained by the light splitting and light combining unit passes through the modulator to enhance the effective length of the modulator, thereby increasing the extinction ratio of the photoelectric modulation chip; The interference effect of the reflected light signals of the two branches further improves the extinction ratio of the photoelectric modulation chip. Secondly, since the extinction ratio of the modulator is about 2-3dB, the modulator can be driven to work with a small CMOS driving voltage, thereby simultaneously meeting the requirements of high extinction ratio and realizing the CMOS driving voltage to drive the modulator.

In a possible implementation manner, when the fourth optical signal and the fifth optical signal are coupled into the light splitting and combining unit, the following relationship is satisfied: α(V)t ² =(1-t) ² ,

When the modulator is in the first state, α(V) is the absorption coefficient of the modulator, and t is the power of the second optical signal transmitted by the first branch of the light-splitting and combining unit and the power of the first optical signal. Ratio of power,

Is the phase difference between the fourth optical signal and the second optical signal,

Is the phase difference between the fifth optical signal and the third optical signal, and V is the bias voltage across the modulator. In this possible implementation manner, the specific modulation result of the second optical signal by the specific phase modulation unit and the specific modulation result of the third optical signal by the optical modulation unit are provided. The fourth optical signal and the fifth optical signal obtained by the modulation are coupled into the light splitting and combining unit to meet the above conditions, and the modulator is in the first state. That is, when the modulator is in the first state, the fourth optical signal and the fifth optical signal cancel each other when they pass through the light splitting and light combining unit.

In another possible implementation manner, when the phase difference between the fourth optical signal and the fifth optical signal is zero or an integer multiple of 2π, the modulator is in the second state. In this possible implementation manner, a specific modulation result of the second optical signal by the phase modulation unit and a specific modulation result of the third optical signal by the optical modulation unit are provided. When the modulated fourth optical signal and the fifth optical signal are coupled into the light splitting and combining unit to meet the above conditions, the modulator is in the second state. That is, when the modulator is in the second state, the fourth optical signal and the fifth optical signal undergo coherent addition when they are combined by the light splitting and light combining unit.

In another possible implementation manner, the light splitting and combining unit includes a first waveguide and a light splitting and combining device. The first waveguide is used for inputting the first optical signal and outputting a sixth optical signal to the light splitting and combining device. The photosynthesizer is used for splitting the first optical signal and combining the fourth optical signal and the fifth optical signal. In this possible implementation, the specific structure of the light splitting and combining unit is provided, which enhances the feasibility of the solution.

In another possible implementation manner, the light splitting and combining unit includes a first waveguide, a second waveguide, and a light splitting and combining device. The first waveguide is used to input the first optical signal to the light splitting and combining device, and the second waveguide Used for outputting the sixth optical signal, the light splitting combiner is used for splitting the first optical signal and combining the fourth optical signal and the fifth optical signal. In this possible implementation manner, another structure of the light splitting and combining unit is provided, which improves the diversity and feasibility of the solution.

In another possible implementation manner, the phase adjustment unit includes a phase adjuster and a first mirror, one end of the phase adjuster is connected to the first branch of the light splitting and combining unit, and the other end of the phase adjuster is connected to the first branch. The reflecting mirror is connected, the first reflecting mirror is used to reflect the second optical signal, and the phase adjuster is used to adjust the phase of the second optical signal. In this possible implementation manner, a specific structure of the phase adjustment unit is provided, which improves the feasibility of the solution.

In another possible implementation manner, the light modulation unit further includes a second reflector, one end of the modulator is connected to the second branch of the light splitting and combining unit, and the other end of the modulator is connected to the second reflector. The second mirror is used to reflect the third optical signal, and the modulator is used to modulate the third optical signal. In this possible implementation manner, a specific structure of the light modulation unit is provided, which enhances the feasibility of the solution.

In another possible implementation manner, the modulator is a reflective electro absorption modulator (REAM), and the mirror surface of the REAM is formed by coating on the cavity surface. In this possible implementation, REAM integrates a modulator and a reflector, with a simple structure, small volume, low cost, and low optical power loss.

In another possible implementation manner, the modulator is an electro absorption modulator (EAM) or a Mach-zehnder modulator (MZM).

In another possible implementation manner, the first reflector is a Sagnac loop-based mirror or a multimode interferometer MMI mirror based on the total reflection effect, and the second reflector is a Sagnac loop-based mirror. Sagnac loop mirror or multimode interferometer (MMI) mirror based on the total reflection effect. The MMI mirror based on the total reflection effect is composed of half an MMI with one input and two outputs. The second optical signal passes through the half Total reflection occurs on the two reflecting surfaces of an MMI. In this possible implementation, two possible forms of the first reflector and the second reflector are provided, which improves the diversity and completeness of the solution.

In another possible implementation manner, the light splitter and combiner is a directional coupler, a Y-waveguide coupler or a multimode interferometer coupler. In this possible implementation, multiple possible implementations of the light splitter and combiner are provided.

A second aspect of the embodiments of the present application provides an optical component, which includes the photoelectric modulation chip as in the first aspect.

A third aspect of the embodiments of the present application provides an optical module, which includes the optical component as in the second aspect.

A fourth aspect of the embodiments of the present application provides an optical network device, and the optical network device includes the optical module as in the third aspect. A fifth aspect of the embodiments of the present application provides a photoelectric modulation method, which includes:

Through the light splitting and combining unit, the input first optical signal is split to obtain the second optical signal and the third optical signal; through the phase adjusting unit, the phase of the second optical signal transmitted by the first branch of the light splitting and combining unit is adjusted , And reflect the second optical signal obtained by phase adjustment, and then perform phase adjustment on the second optical signal obtained by the reflection again to obtain the fourth optical signal; through the optical modulation unit, the second branch of the light-splitting and light-combining unit is transmitted The third optical signal is modulated, and the modulated third optical signal is reflected, and the reflected third optical signal is modulated again to obtain a fifth optical signal. The optical modulation unit includes a modulator, and the light splitting and combining unit The first branch of the light splitting and combining unit is connected to the phase adjustment unit, and the second branch of the light splitting and combining unit is connected to the light modulation unit; through the light splitting and combining unit, the fourth optical signal and the fifth optical signal are combined, and the combined output The sixth optical signal after light. When the modulator is in the first state, the fourth optical signal and the fifth optical signal cancel each other when they are combined by the light splitting and combining unit to obtain the sixth optical signal; when the modulator is When in the second state, the fourth optical signal and the fifth optical signal undergo coherent addition when they are combined by the light splitting and combining unit to obtain a sixth optical signal.

When the modulator is in the first state, α(V) is the absorption coefficient of the modulator, and t is the power of the second optical signal transmitted by the first branch of the light splitting and combining unit and the power of the first optical signal. ratio,

Is the phase difference between the fifth optical signal and the third optical signal, and V is the bias voltage across the modulator. In this possible implementation manner, the specific modulation result of the second optical signal by the specific phase modulation unit and the specific modulation result of the third optical signal by the optical modulation unit are provided. When the modulated fourth optical signal and the fifth optical signal are coupled into the light splitting and combining unit to meet the above conditions, the modulator is in the first state. That is, when the modulator is in the first state, the fourth optical signal and the fifth optical signal cancel each other when they pass through the light splitting and light combining unit.

In another possible implementation manner, the light splitting and combining unit includes a first waveguide and a light splitting and combining device; through the light splitting and combining unit, the input first optical signal is split to obtain the second optical signal and the third light. The signal includes: inputting the first optical signal to the light splitting and combining device through the first waveguide; splitting the first optical signal through the light splitting and combining device to obtain the second optical signal and the third optical signal; through the light splitting and combining unit, Combining the fourth optical signal and the fifth optical signal and outputting the combined sixth optical signal includes: combining the fourth optical signal and the fifth optical signal through a light splitting combiner to obtain the sixth optical signal. Signal; Through the first waveguide, the sixth optical signal is output. In this possible implementation, the specific structure of the light splitting and combining unit is shown, and the process of splitting the first optical signal through the corresponding structure.

In another possible implementation, the light splitting and combining unit includes a first waveguide, a second waveguide, and a light splitting and combining device; through the light splitting and combining unit, the input first optical signal is split to obtain the second optical signal and The third optical signal includes: inputting the first optical signal to the optical splitter and combiner through the first waveguide; split the first optical signal through the optical splitter and combiner to obtain the second optical signal and the third optical signal; The optical unit, combining the fourth optical signal and the fifth optical signal, and outputting the combined sixth optical signal includes: combining the fourth optical signal and the fifth optical signal through a light splitting combiner to obtain The sixth optical signal; the sixth optical signal is output through the second waveguide. In this possible implementation, another specific structure of the light splitting and combining unit is shown, and the process of splitting the first optical signal through the corresponding structure.

In another possible implementation manner, the phase adjusting unit includes a phase adjuster and a first mirror, one end of the phase adjuster is connected to the first branch of the light splitting and combining unit, and the other end of the phase adjuster is connected to the first branch of the light splitting and combining unit. The first mirror is connected; the second optical signal transmitted by the first branch of the light splitting and combining unit is phase adjusted through the phase adjustment unit, and the second optical signal obtained by the phase adjustment is reflected, and then the second optical signal obtained by the reflection is reflected Performing phase adjustment on the two optical signals again to obtain the fourth optical signal includes: performing phase adjustment on the second optical signal through the phase adjuster to obtain the second optical signal after phase adjustment; The adjusted second optical signal is reflected; through the phase adjuster, the phase of the second optical signal obtained by the reflection is adjusted again to obtain the fourth optical signal. In this possible implementation manner, a specific structure of the phase adjustment unit is shown, and the phase adjustment process of the second optical signal is performed through the corresponding structure.

In another possible implementation manner, the light modulation unit further includes a second reflector, one end of the modulator is connected to the second branch of the light splitting and combining unit, and the other end of the modulator is connected to the second reflector The third optical signal transmitted by the second branch of the light splitting and combining unit is modulated by the optical modulation unit, and the third optical signal obtained by the modulation is reflected, and the third optical signal obtained by the reflection is modulated again, Obtaining the fifth optical signal includes: modulating the third optical signal through the modulator to obtain a modulated third optical signal; reflecting the modulated third optical signal through the second mirror; The modulator modulates the third optical signal obtained by reflection again to obtain a fifth optical signal. In this possible implementation manner, a specific structure of the optical modulation unit is shown, and a process of modulating the third optical signal through the corresponding structure.

In another possible implementation manner, the modulator is a reflective electro-absorption modulator REAM, the reflecting mirror of the REAM is formed by a cavity surface coating; the light modulation unit transmits the light to the second branch of the light splitting and combining unit The third optical signal is modulated, and the modulated third optical signal is reflected, and the reflected third optical signal is modulated again to obtain the fifth optical signal. The third optical signal transmitted by the two branches is modulated, the modulated third optical signal is reflected, and the reflected third optical signal is modulated again to obtain the fifth optical signal. In this possible implementation manner, a specific structure of the optical modulation unit is shown, and a process of modulating the third optical signal through the corresponding structure.

The fifth aspect of the embodiments of the present application provides a computer-readable storage medium having instructions stored in the computer-readable storage medium, which when run on a computer, cause the computer to execute the method described in the fourth aspect.

The sixth aspect of the embodiments of the present application provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the method described in the fourth aspect.

It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

It can be seen from the above solution that the photoelectric modulation chip includes a light splitting and combining unit, a phase adjusting unit, and a light modulation unit. The light modulation unit includes a modulator. The first branch of the light splitting and combining unit is connected to the phase adjusting unit. The second branch of the unit is connected to the optical modulation unit; when the modulator is in the first state, the fourth optical signal and the fifth optical signal cancel each other when they are combined by the light-splitting and light-combining unit, and the sixth light is obtained. When the modulator is in the second state, the fourth optical signal and the fifth optical signal undergo coherent addition when they are combined by the light splitting and combining unit to obtain the sixth optical signal. It can be seen that the third optical signal obtained by the light splitting and light splitting unit passes through the modulator to enhance the effective length of the modulator, thereby increasing the extinction ratio of the photoelectric modulation chip; and, through the two light splitting and light combining unit The interference effect of the reflected light signals of each branch further improves the extinction ratio of the photoelectric modulation chip. Secondly, since the extinction ratio of the modulator is about 2-3dB, the modulator can be driven to work with a small CMOS driving voltage, thereby simultaneously meeting the requirements of high extinction ratio and realizing the CMOS driving voltage to drive the modulator.

Description of the drawings

Fig. 1 is a schematic diagram of a structure of a modulator of the existing scheme;

2 is a schematic diagram of a structure of an optical modulation chip according to an embodiment of the application;

FIG. 3A is another schematic diagram of the structure of the light modulation chip according to the embodiment of the application;

3B is another schematic diagram of the structure of the light modulation chip according to the embodiment of the application;

FIG. 4 is another schematic diagram of the structure of the light modulation chip according to the embodiment of the application;

FIG. 5A is another schematic diagram of the structure of the light modulation chip according to the embodiment of the application; FIG.

FIG. 5B is another schematic diagram of the structure of the light modulation chip according to the embodiment of the application;

FIG. 6 is a schematic diagram of an embodiment of a light modulation method according to an embodiment of the application;

FIG. 7 is a schematic structural diagram of the TOSA according to an embodiment of the application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of this application.

The embodiments of the present application provide an optoelectronic modulation chip, an optical component, an optical module, and an optical network device, which are used to increase the extinction ratio of the optoelectronic modulation chip by enhancing the effective length of the modulator in the optoelectronic modulation chip; The interference effect of the reflected light signals of the two branches of the light splitting and combining unit in the modulation chip further improves the extinction ratio of the photoelectric modulation chip. Secondly, since the extinction ratio of the modulator is about 2-3dB, the modulator can be driven to work with a small CMOS driving voltage, thereby simultaneously meeting the requirements of high extinction ratio and realizing the CMOS driving voltage to drive the modulator.

The photoelectric modulation chip provided in the embodiments of the present application may be applied to an optical component, for example, a transmitter optical subassembly (TOSA), and the TOSA may be included in an optical transceiver component (Bi-direction Optical Subassembly, BOSA). The BOSA can be applied to optical modules, which can be installed in optical network equipment.

The optical network equipment may include various optical network terminals, for example, an optical network unit (ONU) or an optical network terminal (ONT). In addition, the optical network equipment can be applied to various communication systems involving optical transmission, for example, it can include passive optical network (PON), GPON, XGPON, EPON, and so on.

The photoelectric modulation chip provided by the embodiment of the present application will be introduced below.

Please refer to FIG. 2, which is a schematic diagram of a result of the photoelectric modulation chip according to the embodiment of the application. As shown in FIG. 2, the photoelectric modulation chip includes a light splitting and combining unit 201, a phase adjustment unit 202 and a light modulation unit 203. The first branch of the light splitting and combining unit 201 is connected to the phase adjustment unit 202, and the second branch of the light splitting and combining unit 201 is connected to the light modulation unit 203. The light modulation unit 203 includes a modulator, and the second branch of the light splitting and combining unit 201 is connected to one end of the modulator of the light modulation unit 203.

The light splitting and combining unit 201 is used for splitting the input first optical signal to obtain a second optical signal and a third optical signal; and sending the second optical signal to the phase adjusting unit on the first branch of the light splitting and combining unit 201, A third optical signal is sent to the light modulation unit on the second branch of the light splitting and combining unit 201.

The phase adjustment unit 202 is used to adjust the phase of the second optical signal transmitted by the first branch of the light splitting and combining unit 201, reflect the second optical signal obtained by the phase adjustment, and then perform the second optical signal again on the reflected second optical signal The phase is adjusted to obtain the fourth optical signal.

The optical modulation unit 203 is used to modulate the third optical signal transmitted by the second branch of the light splitting and combining unit 201, reflect the second optical signal obtained by the modulation, and then modulate the third optical signal obtained by the reflection again, Obtain the fifth optical signal.

The light splitting and combining unit 201 is configured to combine the fourth optical signal and the fifth optical signal, and output the combined sixth optical signal.

Wherein, when the modulator in the optical modulation unit 203 is in the first state, the fourth optical signal and the fifth optical signal cancel each other when they are combined by the light splitting and combining unit 201 to obtain the sixth optical signal; When the modulator in 203 is in the second state, the fourth optical signal and the fifth optical signal undergo coherent addition when they are combined by the light splitting and combining unit 201 to obtain a sixth optical signal.

The cancellation of light means that in the interference of light, the phase cancellation amplitude of two light waves is zero. For example, the fourth optical signal and the fifth optical signal have the same light intensity when they are coupled into the light splitting and combining unit, and the phase difference between the fourth optical signal and the fifth optical signal is ±π, then the fourth optical signal and the fifth optical signal The optical signals are cancelled when they are combined by the light splitting and combining unit 201, and the combined sixth optical signal is obtained.

The coherent addition of light refers to the addition of the amplitude of two light waves whose phase difference is an integer multiple of 0 or 2π in light interference. For example, if the phase difference between the fourth optical signal and the fifth optical signal is an integer multiple of 0 or 2π, then the fourth optical signal and the fifth optical signal undergo coherent addition when they are combined by the light splitting and combining unit 201 to obtain The sixth light signal after combining light.

The light splitting ratio of the first branch of the light splitting and combining unit 201 refers to the ratio of the power of the second optical signal transmitted by the first branch of the light splitting and combining unit 201 to the power of the first optical signal. Here, assuming that the light splitting rate of the first branch of the light splitting and combining unit 201 is t, the light splitting rate of the second branch of the light splitting and combining unit 201 is 1-t, and the light intensity of the first light signal is E, then the fourth light signal The light intensity of is E*t, and the light intensity of the fifth optical signal is E*(1-t). It can be seen that the light intensity of the fourth optical signal coupled into the light splitting and combining unit 201 is E*t ² , and the light intensity of the fifth optical signal coupling into the light splitting and combining unit 201 is E*(1-t) ² .

In this embodiment, the user configures the modulator according to external requirements (for example, applying a bias voltage to both ends of the modulator), so that the modulator modulates the third optical signal to obtain the fifth optical signal. When the fourth optical signal and the fifth optical signal are coupled into the light splitting and combining unit 201, the light intensity meets the relationship: α(V)t ² =(1-t) ² , the phase of the fourth optical signal and the fifth optical signal meets the relationship :

When the modulator is in the first state; when the phase difference between the fourth optical signal and the fifth optical signal is zero or an integer multiple of 2π, the modulator is in the second state. Where α(V) is the absorption coefficient of the modulator of the light modulation unit 203,

Is the phase difference between the fifth optical signal and the third optical signal, and V is the bias voltage across the modulator.

In this embodiment, the modulator is EAM or MZM.

It should be noted that the light splitting and combining unit 201 splits the first optical signal according to the principle of non-equal splitting. The specific ratio can be adjusted according to actual needs, as long as the fourth and fifth optical signals are coupled into the light splitting and combining unit. The light intensity of 201 satisfies the relationship: α(V)t ² =(1-t) ² suffices.

It should be noted that the light splitting and combining unit 201 can also be generally referred to as a light splitting and combining area, the phase adjustment unit 202 can also be generally referred to as a phase adjustment area, and the light modulation unit 203 can also be generally referred to as a light modulation area, which is specifically implemented in this application. The examples are not limited.

In the embodiment of the present application, the third optical signal obtained by the light splitting and combining unit 201 passes through the modulator to enhance the effective length of the modulator, thereby increasing the extinction ratio of the photoelectric modulation chip; and, when the modulator is in In the first state, the fourth optical signal and the fifth optical signal cancel each other when they are combined by the light splitting and combining unit 201 to obtain the sixth optical signal; when the modulator is in the second state, the fourth optical signal and the fifth optical signal are The optical signals undergo coherent addition when they are combined by the light splitting and combining unit 201 to obtain a sixth optical signal. That is, the interference effect of the reflected light signals of the two branches of the light splitting and combining unit 201 further improves the extinction ratio of the photoelectric modulation chip. Secondly, since the extinction ratio of the modulator is about 2-3dB, the modulator can be driven to work with a small CMOS driving voltage, thereby simultaneously meeting the requirements of high extinction ratio and realizing the CMOS driving voltage to drive the modulator.

For example, the modulator is EAM, the refractive index change caused by the QCSE effect is much larger than the refractive index change caused by carrier injection, the EAM with a cavity length of 50 microns, the smaller driving voltage (for example, Vpp is less than 0.5V (volt )) can introduce a phase shift of approximately π. Since the extinction ratio of EAM is about 2-3dB, a smaller current can be injected into the phase adjustment unit to make the fourth light of the first branch and the second branch of the light-splitting unit The phase difference between the signal and the fifth optical signal is π. Therefore, since the extinction ratio of the EAM is about 2-3dB, the EAM can be directly driven by the CMOS driving voltage. In addition, the cavity length of EAM is small to achieve high bandwidth operation. Since the extinction ratio of the light modulation chip is equal to the sum of the extinction ratio of the modulator plus the extinction ratio produced by the multiplexing interference, the combined interference effect can greatly improve the extinction ratio of the light modulation chip, for example, the extinction ratio of the light modulation chip Can be greater than 10dB.

Optionally, in this embodiment, the light splitting and combining unit has a variety of possible structures, which are described below with examples using FIGS. 3A and 3B respectively.

First, referring to FIG. 3A, the light splitting and combining unit includes a first waveguide and a light splitting and combining device. The first branch of the light splitting and combining device is connected to the phase adjustment unit, and the second branch of the light splitting and combining device is connected to the light modulation unit. . Among them, the first waveguide is used to input the first optical signal and output the sixth optical signal to the optical splitter and combiner; the optical splitter and combiner is used to split the first optical signal to obtain the first optical signal and the second optical signal, and The fourth optical signal and the fifth optical signal are combined, and the combined sixth optical signal is output.

Referring to FIG. 3B, the light splitting and combining unit includes a first waveguide, a second waveguide, and a light splitting and combining device. Unit connection. Among them, the first waveguide is used to input the first optical signal to the optical splitter and combiner, and the optical splitter and combiner is used to split the first optical signal to obtain the second optical signal and the second optical signal, as well as the fourth optical signal and the fifth optical signal. The optical signals are combined to obtain a sixth optical signal. The second waveguide is used for the sixth optical signal.

It should be noted that the first branch and the second branch of the light splitting combiner shown in FIGS. 3A and 3B are branch waveguides. For example, the first branch and the second branch of the light splitting combiner are optical fibers, silicon optical waveguides, group III waveguides, and so on. Secondly, the light splitting and combining unit includes a light splitting and combining device, for example, the light splitting and combining unit shown in FIG. 3A or FIG. 3B; the light splitting and combining unit may also include two light splitting and combining devices, one of which The optical device is used to split the first optical signal, and the other optical splitter combiner is used to combine the fourth optical signal and the fifth optical signal to obtain the sixth optical signal, which is not specifically limited in this application.

In this embodiment, the light splitting combiner shown in FIG. 3A and FIG. 3B is a directional coupler, a Y-waveguide coupler or a multimode interferometer coupler, etc., which are not specifically limited in this application.

The structure of the phase adjustment unit 202 is described below. Referring to FIG. 3A, the phase adjusting unit 202 includes a phase adjuster and a first reflector. One end of the phase adjuster is connected to the first branch of the light splitter and combiner, and the other end of the phase adjuster is connected to the first reflector. The phase adjuster is used to adjust the phase of the second optical signal, and the first mirror is used to reflect the second optical signal.

Among them, the phase adjuster can be a waveguide. The user can specifically adjust the phase of the second optical signal in the following ways:

1. Inject a smaller current into the phase regulator;

2. Add an electric field to both ends of the phase adjuster;

3. Adjust the phase of the second optical signal by means of thermal tuning.

The above-mentioned current size, electric field size or thermal tuning temperature value can be set according to actual requirements, as long as the light intensity of the fourth optical signal and the fifth optical signal are coupled into the light splitting and combining unit 201 to satisfy the relationship: α(V) t ² =(1-t) ² , the phases of the fourth optical signal and the fifth optical signal satisfy the relationship:

When the modulator is in the first state, when the phase difference between the fourth optical signal and the fifth optical signal is zero or an integer multiple of 2π, the modulator is in the second state.

In this embodiment, the light modulation unit 203 has a variety of possible structures, which will be illustrated below by using FIGS. 3A and 4 respectively.

Referring to FIG. 3A, the light modulation unit 203 includes a modulator and a second reflector. One end of the modulator is connected to the second branch of the light splitter and combiner, and the other end of the modulator is connected to the second reflector. The modulator is used to modulate the third optical signal, and the mirror is used to reflect the third optical signal.

Among them, the modulator is based on a silicon-based material platform, an InP-based material platform, or a III-V/silicon hybrid platform.

4, the light modulation unit 203 includes a reflective electro-absorption modulator REAM, the REAM integrates a modulator and a reflecting mirror, and the reflecting mirror surface of the reflecting mirror is formed by coating on the cavity surface. The modulator is a REAM based on InP, Ge, or Si, and the reflectivity of the REAM's mirror surface is nearly 100%.

Optionally, when the reflectivity of the REAM mirror surface is not 100%, an mPD can be integrated or a separate MPD can be placed in the REAM to monitor the optical power and improve the stability of the optical power of the optical modulation chip.

In this embodiment, the REAM integrates a modulator and a mirror, and has a simple structure, small size, low cost, and low optical power loss.

Among them, the first reflecting mirror is a Sagnac loop-based mirror or an MMI mirror based on the total reflection effect. The second mirror is a Sagnac loop-based mirror or an MMI mirror based on the total reflection effect.

Two possible forms of the first reflector and the second reflector will be illustrated below with reference to FIGS. 5A and 5B. Please refer to Figure 5A. Both the first mirror and the second mirror are based on the Sagnac loop. The Sagnac loop-based mirror is a mirror with a ring structure formed by two output branches of an optical coupler with one input and two outputs. The reflectivity of the ring structure to light is approximately 100%.

Please refer to Figure 5B, the first mirror and the second mirror are both MMI mirrors based on the total reflection effect. The MMI mirror based on the total reflection effect is composed of half an MMI with one input and two outputs. The second optical signal or the third The optical signal is totally reflected by the two reflecting surfaces of the half MMI mirror. That is, the angle between the two reflecting surfaces of the MMI can cause the second optical signal or the third optical signal to be totally reflected on the two reflecting surfaces of the MMI. For example, as shown in FIG. 5B, the second optical signal is totally reflected by the reflecting surface 1 and the reflecting surface 2 of the MMI mirror, and then the phase adjuster adjusts the phase of the second optical signal obtained by the reflection again.

Please refer to FIG. 6, which is a schematic diagram of an embodiment of the application. As shown in Figure 6, the method includes:

601. The light splitting and combining unit 201 performs light splitting on the input first optical signal to obtain a second optical signal and a third optical signal.

The first optical signal is input to the light-splitting and light-combining unit 201, and the photoelectric modulation device splits the first light signal through the light-splitting and light-combining unit 201 to obtain the second light signal and the third light signal; On the first branch, the second optical signal is sent to the phase adjustment unit 202, and on the second branch of the light splitting and combining unit 201, the third optical signal is sent to the optical modulation unit 203.

Optionally, the light splitting and combining unit 201 has a variety of possible structures. The following describes step 601 with reference to the structures shown in FIG. 3A and FIG. 3B. 3A, the light splitting and combining unit 201 includes a first waveguide and a light splitting combiner, the first branch of the light splitting combiner is connected to the phase adjuster of the phase adjusting unit 202, and the second branch of the light splitting combiner is connected to The modulator of the light modulation unit 203 is connected. 3B, the light splitting and combining unit 201 includes a first waveguide, a second waveguide, and a light splitting and combining device. The first branch of the light splitting and combining device is connected to the phase adjuster of the phase adjusting unit 202. The second branch is connected to the modulator of the light modulation unit 203. Then, based on the structure shown in FIG. 3A and FIG. 3B, step 601 may specifically include step 601a and step 601b.

Step 601a: The photoelectric modulation device inputs the first optical signal through the first waveguide.

Step 601b: The photoelectric modulation device splits the first optical signal through the optical splitter and combiner to obtain the second optical signal and the third optical signal.

The photoelectric modulation device splits the first optical signal through the optical splitter and combiner to obtain the second optical signal and the third optical signal, and sends the second optical signal to the phase adjustment unit 202 and the third optical signal to the optical modulation unit 203 .

602. Through the phase adjustment unit 202, the phase adjustment is performed on the second optical signal transmitted by the first branch of the light splitting and combining unit 201, and the second optical signal obtained by the phase adjustment is reflected, and then the second optical signal obtained by the reflection is reflected The phase adjustment is performed again to obtain the fourth optical signal.

Optionally, as shown in FIG. 3A, the phase adjusting unit 202 includes a phase adjuster and a first mirror. One end of the phase adjuster is connected to the first branch of the light-splitting and combining unit 201, and the other end of the phase adjuster Connect with the first mirror. Then, step 602 includes step 602a to step 602c.

Step 602a: The photoelectric modulation device performs phase adjustment on the second optical signal through the phase adjuster to obtain the second optical signal after phase adjustment.

Step 602b: The photoelectric modulation device reflects the second optical signal after the phase adjustment through the first reflector.

Step 602c: The photoelectric modulation device uses the phase adjuster to adjust the phase of the second optical signal obtained by reflection again to obtain the fourth optical signal.

603. Through the optical modulation unit 203, modulate the third optical signal transmitted by the second branch of the light-splitting and combining unit 201, reflect the modulated third optical signal, and modulate the reflected third optical signal again , Get the fifth optical signal.

Optionally, the light modulation unit 203 has multiple possible structures. Step 603 will be described below in conjunction with the structure shown in FIG. 3A and FIG. 4. Referring to FIG. 3A, the light modulation unit 203 includes a modulator and a second mirror. One end of the modulator is connected to the second branch of the light splitting and combining unit 201, and the other end of the modulator is connected to the second mirror. Then, this step 603 includes step 603a to step 603c.

Step 603a: The photoelectric modulation device modulates the third optical signal through the modulator to obtain the modulated third optical signal.

Step 603b: The photoelectric modulation device reflects the modulated third optical signal through the second mirror to obtain the reflected third optical signal.

Step 603c: The photoelectric modulation device modulates the reflected third optical signal again through the modulator to obtain the fifth optical signal.

4, the optical modulation unit 203 includes REAM, then step 603 specifically includes: the photoelectric modulation device modulates the third optical signal transmitted by the second branch of the light splitting and combining unit 201 through REAM, and modulates the second light signal obtained by the modulation. The three optical signals are reflected, and the third optical signal obtained by the reflection is modulated again to obtain the fifth optical signal.

604. The fourth optical signal and the fifth optical signal are combined by the light splitting and combining unit 201, and the combined sixth optical signal is output.

When the modulator in the optical modulation unit 203 is in the first state, the fourth optical signal and the fifth optical signal cancel each other when they pass through the light splitting and combining unit 201 to obtain a sixth optical signal; When the modulator of is in the second state, the fourth optical signal and the fifth optical signal undergo coherent addition when they are combined by the light splitting and combining unit 201 to obtain a sixth optical signal.

Among them, the destructiveness of light means that in the interference of light, the phase cancellation amplitude of two light waves is zero. For example, the fourth optical signal and the fifth optical signal have the same light intensity when they are coupled into the light splitting and combining unit, and the phase difference between the fourth optical signal and the fifth optical signal is ±π, then the fourth optical signal and the fifth optical signal The optical signals are cancelled when they are combined by the light splitting and combining unit 201, and the combined sixth optical signal is obtained. The coherent addition of light refers to the addition of the amplitude of two light waves whose phase difference is an integer multiple of 0 or 2π in light interference. For example, if the phase difference between the fourth optical signal and the fifth optical signal is an integer multiple of 0 or 2π, then the fourth optical signal and the fifth optical signal undergo coherent addition when they are combined by the light splitting and combining unit 201 to obtain The sixth light signal after combining light.

In this embodiment, the user configures the modulator according to external requirements (for example, applying a bias voltage to both ends of the modulator), so that the modulator modulates the third optical signal to obtain the fifth optical signal; when the fourth optical signal The light intensity coupled with the fifth optical signal into the light splitting and combining unit 201 satisfies the relationship: α(V)t ² =(1-t) ² , and the phases of the fourth optical signal and the fifth optical signal satisfy the relationship:

In this embodiment, the modulator is EAM or MZM.

Optionally, this step 604 is described based on the two possible structures of the light splitting and combining unit 201 shown in FIG. 3A and FIG. 3B. For the structure shown in FIG. 3A, step 604 specifically includes step 604a and step 604b.

Step 604a: The photoelectric modulation device combines the fourth optical signal and the fifth optical signal through the light splitter and combiner to obtain the combined sixth optical signal.

Step 604b: The photoelectric modulation device outputs a sixth optical signal through the first waveguide.

For the structure shown in FIG. 3B, step 604 specifically includes step 604c and step 604d.

Step 604c: The photoelectric modulation device combines the fourth optical signal and the fifth optical signal through the light-splitting optical combiner to obtain a combined sixth optical signal.

Step 604d: The photoelectric modulation device outputs a sixth optical signal through the second waveguide.

In the embodiment of the present application, the third optical signal obtained by the light splitting and combining unit 201 passes through the modulator to enhance the effective length of the modulator, thereby increasing the extinction ratio of the photoelectric modulation device; and, when the modulator is at In the first state, the fourth optical signal and the fifth optical signal cancel each other when they are combined by the light splitting and combining unit 201 to obtain the sixth optical signal; when the modulator is in the second state, the fourth optical signal and the fifth optical signal are The optical signals undergo coherent addition when they are combined by the light splitting and combining unit 201 to obtain a sixth optical signal. That is, the interference effect of the reflected light signals of the two branches of the light splitting and combining unit 201 further improves the extinction ratio of the photoelectric modulation device. Secondly, since the extinction ratio of the modulator is about 2-3dB, the modulator can be driven to work with a small CMOS driving voltage, thereby simultaneously meeting the requirements of high extinction ratio and realizing the CMOS driving voltage to drive the modulator.

The foregoing detailed description of the photoelectric modulation chip provided by the embodiment of the present application, the present application also provides an optical component, an optical module, and an optical network device, etc., where the optical component includes TOSA and BOSA, which will be described separately below.

The embodiment of the present application provides a TOSA. The TOSA may include any photoelectric modulation chip and PLC chip in the foregoing FIGS. 2 to 5B. For the specific structure of the photoelectric modulation chip, please refer to the foregoing FIGS. 2 to 5B.

Exemplarily, as shown in FIG. 7, the present application also provides, for example, a TOSA. The TOSA may include an optoelectronic modulation chip 1, an optoelectronic modulation chip 2, and a PLC chip.

The photoelectric modulation chip 1 includes a light splitting and combining unit, a phase adjustment unit and a light modulation unit. The first branch of the light splitting and combining unit is connected with the phase adjustment unit, and the second branch of the light splitting and combining unit is connected with the light modulation unit. Wherein, the light modulation unit includes a modulator, and the second branch of the light splitting and combining unit is connected to one end of the modulator of the light modulation unit. The structure of the photoelectric modulation chip 2 is similar to the structure of the photoelectric modulation chip 1.

The PLC chip includes a filter 1, a filter 2, and a multiplexer. The filter 1 is used to filter the optical signal output by the photoelectric modulation chip 1, and the filter 2 is used to filter the optical signal output from the photoelectric modulation chip 2. The multiplexer is used to combine the optical signal filtered by the filter 1 and the optical signal filtered by the filter 2, and output the multiplexed signal.

TOSA includes the photoelectric modulation chip in any one of the embodiments of FIGS. 2 to 5B. The third optical signal obtained by the light splitting and combining unit of the photoelectric modulation chip passes through the modulator back and forth, which enhances the effectiveness of the modulator. Length, thereby improving the extinction ratio of the photoelectric modulation chip; and, through the interference effect of the reflected light signals of the two branches of the light splitting and combining unit, the extinction ratio of the photoelectric modulation chip is further improved. Secondly, since the extinction ratio of the modulator is about 2-3dB, the modulator can be driven to work with a small CMOS driving voltage, thereby simultaneously meeting the requirements of high extinction ratio and realizing the CMOS driving voltage to drive the modulator.

It should be noted that Figure 7 above shows the implementation of TOSA including two photoelectric modulation chips. In practical applications, TOSA may only include one photoelectric modulation chip. In this case, the PLC chip can pass through one of the filters. It is connected to the photoelectric modulation chip, and at this time, the PLC chip may not include the multiplexer, which is not specifically limited in this application. Secondly, the TOSA may also include more photoelectric modulation chips. This is only to illustrate the technical solution of the embodiment of the present application, and the TOSA includes two photoelectric modulation chips as an example.

The embodiment of the present application also provides a BOSA, and the BOSA may include a TOSA and an optical receiving assembly (Receiver Optical Subassembly, ROSA).

The TOSA may be the TOSA provided by the embodiment of the present application, and the TOSA includes any photoelectric modulation chip in the foregoing FIGS. 2 to 5B. The TOSA can be used to transmit optical signals.

ROSA may include filters, wavelength division multiplexers, lens arrays, light receiving PD arrays, and so on. ROSA can be used to receive optical signals.

The BOSA provided by the embodiments of the present application may include the photoelectric modulation chip in any one of the embodiments in FIG. 2 to FIG. 5B, and the third optical signal obtained by the light splitting and combining unit 201 of the photoelectric modulation chip passes through the modulator. , The effective length of the modulator is enhanced, thereby improving the extinction ratio of the photoelectric modulation chip; and the interference effect of the reflected light signals of the two branches of the light splitting and combining unit 201 further improves the extinction ratio of the photoelectric modulation chip. Secondly, since the extinction ratio of the modulator is about 2-3dB, the modulator can be driven to work with a small CMOS driving voltage, thereby simultaneously meeting the requirements of high extinction ratio and realizing the CMOS driving voltage to drive the modulator.

Based on the BOSA, an embodiment of the present application also provides an optical module. The optical module provided in this application may include the BOSA, and other modules, such as a transmitting circuit, a receiving circuit, a control circuit, and so on.

The BOSA may include the photoelectric modulation chip in any one of the embodiments in FIG. 2 to FIG. 5B, and the third optical signal obtained by the light splitting and combining unit 201 of the photoelectric modulation chip passes through the modulator back and forth, which enhances the modulation. The effective length of the photoelectric modulation chip increases the extinction ratio of the photoelectric modulation chip; and the interference effect of the reflected light signals of the two branches of the light splitting and combining unit 201 further improves the extinction ratio of the photoelectric modulation chip. Secondly, because the extinction ratio of the modulator is about 2-3dB, the modulator can be driven to work with a small CMOS driving voltage, thereby simultaneously meeting the requirements of high extinction ratio and realizing CMOS driving voltage driving the modulator.

Based on the optical module, an embodiment of the present application also provides an optical network device. The optical network device may include one or more optical modules, and may also include a single board, a control circuit, etc. The components included in different application scenarios may be different, and this application will not repeat them one by one.

For example, BOSA includes a transmitting part and a receiving part, the TOSA provided in this application can be applied to the transmitting part of BOSA, and BOSA can be applied to optical modules. For example, the BOSA may belong to a COMBO unit or a Dense Wavelength Division Multiplexing (DWDM) unit. COMBO unit or DWDM unit can be applied to optical network equipment. Optical network equipment may include network equipment with optical communication functions such as OLT, ONU, and ONT.

According to the method provided in the embodiments of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on a computer, the computer executes the embodiment shown in FIG. 6 Methods.

According to the method provided by the embodiment of the present application, the present application also provides a computer-readable medium storing program code, which when the program code runs on a computer, causes the computer to execute the embodiment shown in FIG. 6 Methods.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and It does not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in a sequence other than the content illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium. , Including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes. .

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the embodiments are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A photoelectric modulation chip, wherein the photoelectric modulation chip includes a light splitting and combining unit, a phase adjusting unit, and a light modulation unit, the light modulation unit includes a modulator, and a first branch of the light splitting and combining unit is connected to the The phase adjustment unit is connected, and the second branch of the light splitting and combining unit is connected with the light modulation unit;

The light splitting and combining unit is used for splitting the input first optical signal to obtain a second optical signal and a third optical signal;

The phase adjustment unit is configured to adjust the phase of the second optical signal transmitted by the first branch of the light splitting and combining unit, reflect the second optical signal obtained by the phase adjustment, and then reflect the second optical signal obtained by the reflection Perform phase adjustment again to obtain the fourth optical signal;

The optical modulation unit is used to modulate the third optical signal transmitted by the second branch of the light-splitting and combining unit, and reflect the modulated third optical signal, and then perform the reflected third optical signal again Modulate to obtain the fifth optical signal;

The light splitting and combining unit is used to combine the fourth optical signal and the fifth optical signal, and output the combined sixth optical signal, wherein, when the modulator is in the first state, The fourth optical signal and the fifth optical signal cancel each other when they are combined by the light splitting and combining unit to obtain the sixth optical signal; when the modulator is in the second state, the first optical signal is The four optical signals and the fifth optical signal undergo coherent addition when they are combined by the light splitting and combining unit to obtain the sixth optical signal.
The photoelectric modulation chip according to claim 1, wherein when the fourth optical signal and the fifth optical signal are coupled into the light splitting and combining unit, the following relationship is satisfied: α(V)t 2 = (1 -t) 2 ,
When the modulator is in the first state, α(V) is the absorption coefficient of the modulator, and t is the power of the second optical signal transmitted by the first branch of the light-splitting and combining unit and the total The ratio of the power of the first optical signal,
Is the phase difference between the fourth optical signal and the second optical signal,
Is the phase difference between the fifth optical signal and the third optical signal, and V is the bias voltage across the modulator.
The photoelectric modulation chip according to claim 1 or 2, wherein when the phase difference between the fourth optical signal and the fifth optical signal is zero or an integer multiple of 2π, the modulator is at The second state.
The optoelectronic modulation chip according to any one of claims 1 to 3, wherein the light splitting and light combining unit comprises a first waveguide and a light splitting and combining device, and the first waveguide is used to transmit light to the light splitting and combining unit. The optical device inputs the first optical signal and outputs the sixth optical signal. The optical splitter and combiner is used to split the first optical signal and perform the fourth optical signal and the fifth optical signal. Heguang.
The photoelectric modulation chip according to any one of claims 1 to 3, wherein the light splitting and combining unit includes a first waveguide, a second waveguide, and a light splitting combiner, and the first waveguide is used to The optical splitter and combiner inputs the first optical signal, the second waveguide is used for outputting the sixth optical signal, and the optical splitter and combiner is used for splitting the first optical signal and for the first optical signal. The four optical signals are combined with the fifth optical signal.
The photoelectric modulation chip according to any one of claims 1 to 5, wherein the phase adjustment unit comprises a phase adjuster and a first mirror, and one end of the phase adjuster is combined with the light splitter. The first branch of the unit is connected, the other end of the phase adjuster is connected to the first mirror, the first mirror is used to reflect the second optical signal, and the phase adjuster is used to The second optical signal undergoes phase adjustment.
The photoelectric modulation chip according to any one of claims 1 to 6, wherein the light modulation unit further comprises a second reflecting mirror, and one end of the modulator is connected to the second light splitting and combining unit. Branch connection, the other end of the modulator is connected to the second mirror, the second mirror is used to reflect the third optical signal, and the modulator is used to perform the third optical signal modulation.
The optoelectronic modulation chip according to any one of claims 1 to 6, wherein the modulator is a reflective electro-absorption modulator REAM, and the mirror surface of the REAM is formed by a cavity surface coating.
The photoelectric modulation chip according to claim 6 or 7, wherein the first reflector is a Sagnac loop-based mirror or a multi-mode interferometer MMI mirror based on a total reflection effect. The second mirror is a Sagnac loop-based mirror or a multi-mode interferometer MMI mirror based on the total reflection effect. The Sagnac loop-based mirror is a mirror in which the two output branches of the optical coupler form a ring structure. The MMI mirror surface based on the total reflection effect is composed of half an MMI with one input and two outputs, and the second optical signal is totally reflected by the two reflection surfaces of the half MMI.
An optical component, characterized in that the optical component comprises the photoelectric modulation chip according to any one of claims 1 to 9.
An optical module, characterized in that the optical module comprises the optical component according to claim 10.
An optical network device, wherein the optical network device comprises the optical module according to claim 11.