Light output turn-off control method and system based on silicon light technology, and optical module

Abstract

The invention relates to the technical field of optical communication, in particular to an optical output turn-off control method and system based on the silicon optical technology and an optical module.The method comprises the following steps that when an optical output turn-off instruction is received, temperature information is obtained; indexing from the lookup table according to the temperature information by using a linear interpolation algorithm to obtain a preset voltage value; and controlling the working voltage of the heater based on the preset voltage value, and closing modulation signal output of the target channel. The working voltage of the heater in the silicon light modulator is set according to temperature linear interpolation, modulation signal output is closed to reduce emergent light, control over single-channel emergent light can be achieved, extra hardware cost does not need to be increased, power consumption and control complexity during light output turn-off are effectively reduced, and influences on other channels can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to a method, system and optical module for controlling light output shutdown based on silicon photonics technology. Background Art

[0002] As the speed of optical modules continues to increase, traditional direct modulation has approached the bandwidth limit, and the cost of external modulation lasers (EMLs) is relatively high. In comparison, silicon-based devices not only have high modulation bandwidth, but also have advantages in device size, integration scale and cost.

[0003] Especially for 800G products, after the introduction of silicon photonics technology, the number of lasers has been reduced while the modulation and transmission of 8 independent signals can be realized, thus saving the cost of chips and devices. For silicon photonics modules, some have 4 channels sharing one laser, and some have 2 channels sharing one laser. So how to control the output of a single-channel optical signal is a problem that will be faced at this stage and in the future.

[0004] See also Figure 6 As shown, Figure 6 The figure shows an existing technology that controls the output light through a VOA chip. This existing technology adds a VOA chip to each channel, aiming to achieve light attenuation through the VOA chip, thereby achieving the purpose of reducing the output optical power. Although this existing technology can achieve -25dbm or even below -30dbm when the optical output is turned off, multiple VOA chips will also bring higher costs and higher power consumption.

[0005] See also Figure 7 As shown, Figure 7 It is shown that the second prior art controls the output light through a tunable splitter. The prior art can not only be used to adjust the power uniformity between each path through the tunable splitter, but also can achieve light attenuation on each path. However, it relies on the implementation method of the silicon photonic chip. When the tunable splitter voltage is adjusted at the same time, one path of light decreases while the other path of light increases. In order to keep the other path of light output unchanged, the only way is to reduce the bias current bias setting value, and the control process is complicated.

[0006] Based on this, how to reduce the power consumption, control complexity and impact on other channels when a single-channel optical output is turned off without increasing hardware costs is a technical problem that urgently needs to be solved. Summary of the invention

[0007] The purpose of the present invention is to provide a light output shutdown control method, system and optical module based on silicon photonics technology, so as to solve the problem of how to reduce the power consumption, control complexity and impact on other channels when a single-channel light output is shut down without increasing hardware costs. This is a technical problem that urgently needs to be solved.

[0008] The present invention is implemented by the following technical solution: A light output shutoff control method based on silicon photonics technology comprises the following steps:

[0009] When receiving a light output shut-off instruction, obtaining temperature information;

[0010] Using a linear interpolation algorithm, a preset voltage value is obtained by indexing from a lookup table according to the temperature information, wherein the lookup table is constructed based on a first curve at different temperatures, wherein the first curve is a curve of average optical power of the optical module changing with the operating voltage of a heater in a silicon optical modulator, and the preset voltage value is an operating voltage of the heater corresponding to a valley value of the first curve;

[0011] The operating voltage of the heater is controlled based on the preset voltage value, and the modulation signal output of the target channel is turned off.

[0012] According to a preferred embodiment, after turning off the modulation signal output of the target channel, the method further includes dynamically adjusting the operating voltage of the heater based on the light output power monitoring photocurrent of the silicon photomodulator.

[0013] According to a preferred embodiment, the method of dynamically adjusting the operating voltage of the heater based on the output optical power monitoring photocurrent of the silicon optical modulator specifically includes:

[0014] Acquire the first output optical power monitoring photocurrent of the silicon optical modulator after the modulation signal output of the target channel is turned off;

[0015] Obtaining a second optical output power monitoring photocurrent of the silicon photomodulator when the heater operates at a first operating voltage and a third optical output power monitoring photocurrent when the heater operates at a second operating voltage, wherein the first operating voltage is the sum of a preset voltage value and a voltage deviation value, and the second operating voltage is the difference between the preset voltage value and the voltage deviation value;

[0016] Determine the maximum value among the first light output power monitoring photocurrent, the second light output power monitoring photocurrent and the third light output power monitoring photocurrent, use the heater operating voltage corresponding to the maximum value as the preset voltage value, update the lookup table, and control the heater operating voltage based on the updated lookup table.

[0017] According to a preferred implementation, the temperature information is laser temperature and / or optical module temperature.

[0018] The present invention also provides a light output shutoff control system based on silicon photonics technology, comprising:

[0019] A temperature acquisition module is configured to acquire temperature information when receiving a light output shut-off instruction;

[0020] A search module is configured to obtain a preset voltage value by indexing from a lookup table according to the temperature information using a linear interpolation algorithm, wherein the lookup table is constructed based on a first curve at different temperatures, wherein the first curve is a curve of average optical power of the optical module as a function of an operating voltage of a heater in a silicon optical modulator, and the preset voltage value is an operating voltage of the heater corresponding to a valley value of the first curve;

[0021] The control module is configured to control the operating voltage of the heater based on the preset voltage value and turn off the modulation signal output of the target channel.

[0022] According to a preferred embodiment, it also includes a dynamic adjustment module, which is configured to dynamically adjust the operating voltage of the heater based on the output light power of the silicon photomodulator and the monitoring photocurrent after the modulation signal output of the target channel is turned off.

[0023] According to a preferred embodiment, the dynamic adjustment module includes:

[0024] A first acquisition submodule is configured to acquire a first output optical power monitoring photocurrent of the silicon optical modulator after the modulation signal output of the target channel is turned off;

[0025] A second acquisition submodule is configured to acquire a second optical output power monitoring photocurrent of the silicon photomodulator when the heater operates at a first operating voltage and a third optical output power monitoring photocurrent when the heater operates at a second operating voltage, wherein the first operating voltage is the sum of a preset voltage value and a voltage deviation value, and the second operating voltage is the difference between the preset voltage value and the voltage deviation value;

[0026] The update module is configured to determine the maximum value among the first light output power monitoring photocurrent, the second light output power monitoring photocurrent and the third light output power monitoring photocurrent, use the heater operating voltage corresponding to the maximum value as the preset voltage value, update the lookup table, and control the heater operating voltage based on the updated lookup table.

[0027] According to a preferred implementation, the temperature information is laser temperature and / or optical module temperature.

[0028] The present invention also provides an optical module, which is applied to the optical output shutoff control method based on silicon photonics technology as described above.

[0029] The technical solutions of a light output shutdown control method, system and optical module based on silicon photonics technology provided by the present invention have at least the following advantages and beneficial effects: (1) The present invention sets the heater operating voltage in the silicon photonics modulator according to temperature linear interpolation, turns off the modulation signal output to reduce the light output, and can realize the control of single-channel light output without increasing additional hardware costs, effectively reducing the power consumption and control complexity when the light output is turned off, and reducing the impact on other channels; (2) The present invention can achieve the goal of light output less than -20dbm when the single-channel light output is turned off by dynamically tracking the operating voltage of the heater, reducing the difficulty of production debugging, and at the same time, the light output size will not be significantly increased due to the offset of the first curve, and has better tracking performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic flow chart of a light output shutoff control method based on silicon photonics technology provided in Embodiment 1 of the present invention;

[0031] Figure 2 A first curve schematic diagram provided in Example 1 of the present invention;

[0032] Figure 3 A schematic diagram of linear interpolation provided in Embodiment 1 of the present invention;

[0033] Figure 4 A schematic diagram of a dynamic adjustment process provided by Embodiment 2 of the present invention;

[0034] Figure 5 A second curve schematic diagram provided for Example 2 of the present invention;

[0035] Figure 6 A schematic diagram of a prior art of background technology 1;

[0036] Figure 7 It is a schematic diagram of the second prior art of the background technology. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Example 1

[0039] See also Figure 1 As shown, Figure 1The present invention provides a flow chart of a method for controlling light output shutdown based on silicon photonics technology. The method for controlling light output shutdown based on silicon photonics technology provided in this embodiment includes a lookup table construction step, an information indexing step and a control step.

[0040] The steps of constructing the lookup table are as follows: in the production stage, a first curve is scanned at different temperatures, where the first curve is a curve Heater vs AP showing the average optical power AP of the optical module changing with the operating voltage Heater of the heater in the silicon optical modulator.

[0041] Furthermore, a lookup table of the heater operating voltage is constructed based on the first curve Heater vs AP at different temperatures, and the lookup table is written into the module flash for storage.

[0042] The information indexing steps are as follows: when receiving the optical output shutdown command Disable Tx, temperature information is obtained; the temperature information is the laser temperature and / or the optical module temperature, which is not specifically limited here.

[0043] Further, using the linear interpolation algorithm, see Figure 3 As shown, according to the temperature information, a preset voltage value is obtained by indexing from the lookup table. The preset voltage value is the working voltage of the heater corresponding to the valley value of the first curve. For details of the valley value of the first curve, see Figure 2 shown.

[0044] The control steps are as follows: control the operating voltage of the heater based on the preset voltage value obtained by the index, turn off the modulation signal output of the target channel, further reduce the light output size, make the light output as small as possible, and achieve the goal of less than -20dbm.

[0045] In summary, the present invention sets the heater operating voltage in the silicon light modulator according to temperature linear interpolation, turns off the modulation signal output to reduce the light output, and can achieve single-channel light output control without increasing additional hardware costs, effectively reducing power consumption and control complexity when the light output is turned off, and reducing the impact on other channels.

[0046] Example 2

[0047] This embodiment is based on the technical solution provided in Embodiment 1 and further improves it to solve the problem that the first curve drifts due to the fixed lookup table and the change of the working state of the module, causing the preset voltage value obtained by the index to no longer correspond to the valley value of the first curve, so that the light output of the target channel becomes larger; the specific improvements are as follows:

[0048] In this embodiment, after turning off the modulation signal output of the target channel, the method also includes dynamically tracking the trough of the first curve based on the optical power monitoring photocurrent of the silicon photomodulator, and dynamically adjusting the operating voltage of the heater to avoid the situation where the light output becomes larger when the light output is turned off due to factors such as long-term use or temperature changes.

[0049] Specifically in this embodiment, see Figure 4 As shown, the operating voltage of the heater is dynamically adjusted based on the output optical power monitoring photocurrent of the silicon optical modulator, specifically including:

[0050] The first optical output power monitoring photocurrent Pdf of the silicon photomodulator is obtained after the target channel modulation signal output is turned off; the second optical output power monitoring photocurrent pdf_plus of the silicon photomodulator when the heater operates under the first working voltage condition and the third optical output power monitoring photocurrent pdf_minus of the silicon photomodulator when the heater operates under the second working voltage condition are obtained, wherein the first working voltage is the sum of the preset voltage value and the voltage deviation value, and the second working voltage is the difference between the preset voltage value and the voltage deviation value.

[0051] It should be noted that since the design of the silicon photonic chip cannot ensure that the actual light output on each path can be monitored in real time, pdf is used instead in this embodiment; and since the trends of pdf and AP are opposite, this embodiment tracks the peak of the second curve instead of tracking the trough of the first curve, wherein the second curve is a curve Heater vs pdf of the light output power monitoring photocurrent pdf of the silicon photonic modulator changing with the heater operating voltage Heater in the silicon photonic modulator.

[0052] Furthermore, the maximum value among the first light output power monitoring photocurrent pdf, the second light output power monitoring photocurrent pdf_plus and the third light output power monitoring photocurrent pdf_minus is determined, and the heater operating voltage corresponding to the maximum value is used as the preset voltage value, the lookup table is updated, and the heater operating voltage is controlled based on the updated lookup table to maintain the light output unchanged.

[0053] In summary, the present invention can achieve the goal of light output less than -20dbm when the single-channel light output is turned off by dynamically tracking the operating voltage of the heater, reducing the difficulty of production debugging. At the same time, the light output size will not increase significantly due to the offset of the first curve, and has better tracking performance.

[0054] Example 3

[0055] The embodiment of the present invention provides a light output shutdown control system based on silicon photonics technology based on the technical solution provided in any one of Embodiments 1 to 2, including a temperature acquisition module, a search module, a control module and a dynamic adjustment module.

[0056] The temperature acquisition module is configured to acquire temperature information when receiving the light output shut-off instruction, wherein the temperature information is the laser temperature and / or the light module temperature.

[0057] The search module is configured to use a linear interpolation algorithm to obtain a preset voltage value by indexing from a lookup table according to the temperature information. The lookup table is constructed based on a first curve at different temperatures. The first curve is a curve of the average optical power of the optical module changing with the operating voltage of the heater in the silicon photonic modulator. The preset voltage value is the operating voltage of the heater corresponding to the valley value of the first curve.

[0058] The control module is configured to control the operating voltage of the heater based on the preset voltage value and turn off the modulation signal output of the target channel.

[0059] The dynamic adjustment module is configured to dynamically adjust the operating voltage of the heater based on the output light power monitoring photocurrent of the silicon photomodulator after the modulation signal output of the target channel is turned off.

[0060] Furthermore, the dynamic adjustment module includes a first acquisition submodule, a second acquisition submodule and an update module. The first acquisition submodule is configured to acquire the first optical output power monitoring photocurrent of the silicon photomodulator after the modulation signal output of the target channel is turned off; the second acquisition submodule is configured to acquire the second optical output power monitoring photocurrent of the silicon photomodulator when the heater works under the first working voltage condition and the third optical output power monitoring photocurrent when the heater works under the second working voltage condition, the first working voltage is the sum of the preset voltage value and the voltage deviation value, and the second working voltage is the difference between the preset voltage value and the voltage deviation value; the update module is configured to determine the maximum value among the first optical output power monitoring photocurrent, the second optical output power monitoring photocurrent and the third optical output power monitoring photocurrent, take the heater working voltage corresponding to the maximum value as the preset voltage value, update the lookup table, and control the working voltage of the heater based on the updated lookup table.

[0061] Example 4

[0062] Based on the technical solutions provided in Examples 1 and 2, the embodiments of the present invention provide an optical module, which is applied to the optical output shutdown control method based on silicon photonics technology as described in any one of Examples 1 and 2.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling light output shutdown based on silicon photonics technology, characterized in that: The following steps are involved: When receiving a light output shut-off instruction, obtaining temperature information; Using a linear interpolation algorithm, a preset voltage value is obtained by indexing from a lookup table according to the temperature information, wherein the lookup table is constructed based on a first curve at different temperatures, wherein the first curve is a curve of average optical power of the optical module changing with the operating voltage of a heater in a silicon optical modulator, and the preset voltage value is an operating voltage of the heater corresponding to a valley value of the first curve; The operating voltage of the heater is controlled based on the preset voltage value, and the modulation signal output of the target channel is turned off.

2. The light output shutoff control method based on silicon photonics technology according to claim 1, characterized in that: After turning off the modulation signal output of the target channel, the method further includes dynamically adjusting the operating voltage of the heater based on the light output power monitoring photocurrent of the silicon photomodulator.

3. The light output shutoff control method based on silicon photonics technology as claimed in claim 2, characterized in that: The method of dynamically adjusting the operating voltage of the heater based on the output light power monitoring photocurrent of the silicon optical modulator specifically includes: Acquire the first output optical power monitoring photocurrent of the silicon optical modulator after the modulation signal output of the target channel is turned off; Obtaining a second optical output power monitoring photocurrent of the silicon photomodulator when the heater operates at a first operating voltage and a third optical output power monitoring photocurrent when the heater operates at a second operating voltage, wherein the first operating voltage is the sum of a preset voltage value and a voltage deviation value, and the second operating voltage is the difference between the preset voltage value and the voltage deviation value; Determine the maximum value among the first light output power monitoring photocurrent, the second light output power monitoring photocurrent and the third light output power monitoring photocurrent, use the heater operating voltage corresponding to the maximum value as the preset voltage value, update the lookup table, and control the heater operating voltage based on the updated lookup table.

4. The light output shutoff control method based on silicon photonics technology according to any one of claims 1 to 3, characterized in that: The temperature information is the laser temperature and / or the optical module temperature.

5. A light output shutoff control system based on silicon photonics technology, characterized in that: include: A temperature acquisition module is configured to acquire temperature information when receiving a light output shut-off instruction; A search module is configured to obtain a preset voltage value by indexing from a lookup table according to the temperature information using a linear interpolation algorithm, wherein the lookup table is constructed based on a first curve at different temperatures, wherein the first curve is a curve of average optical power of the optical module as a function of an operating voltage of a heater in a silicon optical modulator, and the preset voltage value is an operating voltage of the heater corresponding to a valley value of the first curve; The control module is configured to control the operating voltage of the heater based on the preset voltage value and turn off the modulation signal output of the target channel.

6. The light output shutoff control system based on silicon photonics technology as claimed in claim 5, characterized in that: It also includes a dynamic adjustment module, which is configured to dynamically adjust the operating voltage of the heater based on the output light power monitoring photocurrent of the silicon photomodulator after the modulation signal output of the target channel is turned off.

7. The light output shutoff control system based on silicon photonics technology as claimed in claim 6, characterized in that: The dynamic adjustment module comprises: A first acquisition submodule is configured to acquire a first output optical power monitoring photocurrent of the silicon optical modulator after the modulation signal output of the target channel is turned off; A second acquisition submodule is configured to acquire a second optical output power monitoring photocurrent of the silicon photomodulator when the heater operates at a first operating voltage and a third optical output power monitoring photocurrent when the heater operates at a second operating voltage, wherein the first operating voltage is the sum of a preset voltage value and a voltage deviation value, and the second operating voltage is the difference between the preset voltage value and the voltage deviation value; The update module is configured to determine the maximum value among the first light output power monitoring photocurrent, the second light output power monitoring photocurrent and the third light output power monitoring photocurrent, use the heater operating voltage corresponding to the maximum value as the preset voltage value, update the lookup table, and control the heater operating voltage based on the updated lookup table.

8. The light output shutoff control system based on silicon photonics technology according to any one of claims 5 to 7, characterized in that: The temperature information is the laser temperature and / or the optical module temperature.

9. An optical module, characterized in that: Applied to the light output shutoff control method based on silicon photonics technology as described in any one of claims 1 to 4.

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