CN110542959A - Method and device for preventing emitted light wavelength fluctuation when optical module is powered on - Google Patents
Method and device for preventing emitted light wavelength fluctuation when optical module is powered on Download PDFInfo
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- CN110542959A CN110542959A CN201910859916.5A CN201910859916A CN110542959A CN 110542959 A CN110542959 A CN 110542959A CN 201910859916 A CN201910859916 A CN 201910859916A CN 110542959 A CN110542959 A CN 110542959A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4266—Thermal aspects, temperature control or temperature monitoring
- G02B6/4268—Cooling
- G02B6/4271—Cooling with thermo electric cooling
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
Abstract
The application discloses a method and a device for preventing emitted light wavelength fluctuation when an optical module is powered on. The controller determines a delay time length according to a temperature difference value between the temperature of the transmitting laser and a target temperature value, and when the waiting starting time length of the transmitting laser reaches the delay time length, a second starting instruction is sent to the transmitting laser to control the transmitting laser to start. At this time, the temperature of the emitting laser at the time of starting emitting the light wavelength is close to or the same as the target temperature value, the temperature change is small, the light wavelength cannot be fluctuated or is small, and therefore the laser can be protected from being interfered by the temperature fluctuation and can emit the laser as fast as possible. Therefore, the method and the device provided by the invention can avoid the phenomenon of optical wavelength fluctuation to protect the emitting laser, and can enable the optical module to output light with stable wavelength as fast as possible, thereby meeting the standard of the optical module.
Description
Technical Field
The present invention relates to the field of optical fiber communication technologies, and in particular, to a method and an apparatus for preventing a wavelength fluctuation of emitted light when an optical module is powered on.
Background
The optical module is used for converting photoelectric signals, the photoelectronic device in the optical module comprises a transmitting part and a receiving part, and the device for transmitting the optical signals at the transmitting part is a transmitting laser. Different emission lasers emit different optical wavelength ranges, that is, different temperature points at which the emission lasers operate, and the same emission laser can only output optical signals within a certain optical wavelength range. The wavelength of light emitted by the emitting laser has the characteristic of changing along with the temperature change, and in order to enable the emitting laser to emit an optical signal with a desired wavelength, the emitting laser needs to be controlled to work at a certain fixed temperature all the time. Therefore, the optical module needs to control the temperature of the emitting laser by means of a TEC (Thermo Electric Cooler) to be maintained at a fixed temperature, so that the emitting laser can output an optical signal with stable wavelength.
The temperature of the transmitting laser is detected by a thermistor (thermistor). The TEC is a closed-loop control module, a target temperature value is preset according to the temperature of the emission laser, and the TEC can carry out automatic closed-loop control according to the set target temperature value and the initial temperature value of the emission laser, so that the temperature of the emission laser is stabilized on the target temperature value, and whether the temperature of the emission laser is stabilized on the target temperature value or not is detected by the thermistor.
Generally, the same optical module only outputs an optical signal with one wavelength, that is, the wavelength of the emitted light of the emitting laser is not changed from the power-on of the optical module, so the target temperature value of the TEC is not changed. However, when the optical module is just powered on, it takes a period of time for the TEC to control the temperature of the emission laser to reach the target temperature value, and the wavelength of the emitted light emitted by the optical module fluctuates up and down during the period of time, and is stabilized after the period of time elapses. Moreover, the temperature of the first optical module during power-on (namely the current temperature of the emitting laser) and the target temperature value have a temperature difference, and the larger the temperature difference is, the larger the fluctuation amplitude of the optical wavelength is, the longer the fluctuation time is, and the emitting laser is easily damaged by the fluctuation of the emitting optical wavelength with the larger amplitude.
disclosure of Invention
The application provides a method and a device for preventing emitted light wavelength fluctuation when an optical module is powered on, and aims to solve the problem that an existing optical module is prone to damage an emission laser due to emitted light wavelength fluctuation when the optical module is powered on.
In a first aspect, the present application provides a method for preventing a wavelength of emitted light from fluctuating when an optical module is powered on, including the following steps:
when an optical module is powered on, sending a first starting instruction to a TEC control circuit, wherein the TEC control circuit is used for controlling the TEC to be started according to the first starting instruction;
Timing the waiting starting time of the emission laser;
Acquiring an initial temperature value of the transmitting laser detected by the temperature sensor;
Determining a delay time length according to the temperature difference value between the initial temperature value and the target temperature value; the target temperature value is a temperature value at a wavelength of emission light which enables the emission laser to emit stably; the delay time is the time required for the TEC to control the temperature of the emission laser to be stabilized at the target temperature value through temperature adjustment;
When the waiting starting time length is consistent with the delay time length, generating a second starting instruction;
And sending the second starting instruction to the emission laser to control the emission laser to start and emit emission light wavelength suitable for the target temperature value.
in a second aspect, the present application further provides an apparatus for preventing a wavelength of emitted light from fluctuating when an optical module is powered on, including:
The first starting instruction sending module is used for sending a first starting instruction to the TEC control circuit when the optical module is powered on, and the TEC control circuit is used for controlling the TEC to be started according to the first starting instruction;
The timing module is used for timing the waiting starting time of the emission laser;
An initial temperature value acquisition module for acquiring an initial temperature value of the emission laser detected by the temperature sensor;
The delay time length determining module is used for determining the delay time length according to the temperature difference value of the initial temperature value and the target temperature value; the target temperature value is a temperature value at a wavelength of emission light which enables the emission laser to emit stably; the delay time is the time required for the TEC to control the temperature of the emission laser to be stabilized at the target temperature value through temperature adjustment;
The second starting instruction generating module is used for generating a second starting instruction when the waiting starting time length is consistent with the delay time length;
and the second starting instruction sending module is used for sending the second starting instruction to the emission laser so as to control the emission laser to be started and emit emission light wavelength suitable for the target temperature value.
As can be seen from the foregoing technical solutions, in the method and the apparatus for preventing fluctuation of a wavelength of light emitted by an optical module when the optical module is powered on, a controller only sends a first turn-on instruction to a TEC control circuit to control turning on of a TEC, and does not send a second turn-on instruction to a laser emitter, that is, the laser emitter is in a turn-off state after the optical module is powered on. The controller determines the delay time length according to the temperature difference value between the temperature of the emission laser in the closed state and the target temperature value, and when the waiting starting time length of the emission laser reaches the delay time length, the controller generates a second starting instruction to be directly sent to the emission laser to control the emission laser to be started. At this time, the temperature of the emitting laser at the time of starting emitting the light wavelength is close to or the same as the target temperature value, the temperature change is small, the light wavelength cannot be fluctuated or is small, and therefore the laser can be protected from being interfered by the temperature fluctuation and can emit the laser as fast as possible. Therefore, the method and the device provided by the embodiment of the invention can avoid the phenomenon of optical wavelength fluctuation to protect the emitting laser, can enable the optical module to output light with stable wavelength as fast as possible, and can meet the standard of the optical module.
drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a graph of emitted light wavelength of a transmitting laser and operating temperature of the transmitting laser provided by an embodiment of the present invention;
Fig. 2 is a control block diagram of an optical module according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for preventing a wavelength of a light emitted by an optical module from fluctuating when the optical module is powered on according to an embodiment of the present invention;
Fig. 4 is a waveform diagram of temperature fluctuation generated by powering on an optical module at different temperatures according to an embodiment of the present invention;
Fig. 5 is a schematic diagram of a TEC according to an embodiment of the present invention;
fig. 6 is a block diagram of a structure of a device for preventing a wavelength fluctuation of emitted light when an optical module is powered on according to an embodiment of the present invention.
Detailed Description
the wavelength of output light of the emitting laser of the optical module changes along with the temperature change, the change can be in a certain range, and the optical wavelengths required to be output by different products are different, so that the corresponding TECs are arranged in different optical modules for controlling the temperature, and the emitting laser always works at a certain fixed temperature instead of changing along with the ambient temperature.
the wavelength of light output by the emitting laser and the operating temperature of the emitting laser can be regarded as a positive correlation linear relationship, as shown in fig. 1, so that the oscillation of the temperature of the emitting laser can cause the wavelength of output light to fluctuate, and the fluctuation waveform is similar to the waveform of the temperature oscillation.
in order to avoid that the current temperature of the emission laser is different from the temperature required by the emission laser to stably emit the light wavelength when the optical module is powered on, so that the emission light wavelength of the emission laser fluctuates due to the temperature difference, embodiments of the present invention provide a system for preventing the emission light wavelength from fluctuating when the optical module is powered on, so that the emission laser can emit the light wavelength at the required temperature, that is, at the stable temperature, the light wavelength is prevented from fluctuating due to the temperature change, and the condition that the emission laser is damaged is avoided.
fig. 2 is a control block diagram of an optical module according to an embodiment of the present invention. The method for preventing the wavelength fluctuation of the emitted light when the optical module is powered on provided by the embodiment of the invention is applied to the optical module shown in fig. 2, and the optical module comprises the following components: TEC, TEC control circuit, transmission laser, temperature sensor and controller. The temperature sensor is arranged on the transmitting laser and used for detecting the initial temperature value of the transmitting laser and sending the initial temperature value of the transmitting laser to the controller. The controller is respectively connected with the TEC control circuit and the transmitting laser, and is used for sending a starting instruction to the transmitting laser to control the starting of the transmitting laser and sending an instruction to the TEC control circuit, and the TEC control circuit is connected with the TEC to control the TEC to start and control the temperature. And in order to control the temperature of the transmitting laser, the transmitting laser is arranged on the TEC, and the TEC is used for refrigerating or heating the transmitting laser according to a command of the controller sent by the TEC control circuit so as to adjust the temperature of the transmitting laser to be consistent with a target temperature value.
in order to prevent the emitted light wavelength of the emission laser from fluctuating when the optical module is powered on, in this embodiment, the controller does not directly start the emission laser after being powered on, but only starts the TEC, and when the temperature of the emission laser is adjusted to a target temperature value by the TEC, the start of the emission laser is controlled. In order to implement this process and prevent the emitted light wavelength from fluctuating, as shown in fig. 3, the method for preventing the emitted light wavelength from fluctuating when the optical module is powered on according to the embodiment of the present invention is implemented by using a controller, and the method includes the following steps:
S1, when the optical module is powered on, sending a first starting instruction to the TEC control circuit, wherein the TEC control circuit is used for controlling the TEC to start according to the first starting instruction.
in order to enable the TEC to enter a working state earlier, so as to shorten the time for adjusting the temperature of the emission laser to a target temperature value, and to conveniently start the emission laser as soon as possible, so as to meet the power-on and light-emitting standards of the optical module, in this embodiment, the TEC is immediately started when the optical module is powered on.
after the optical module is powered on, the controller is powered on immediately and generates a first starting instruction, and the first starting instruction is used for controlling the starting of the TEC. The controller sends the first opening instruction to the TEC control circuit, and the TEC control circuit drives the TEC to open.
and S2, timing the waiting starting time of the emission laser.
due to the method, when the optical module is powered on, in order to avoid the situation that the emission laser is easy to fluctuate due to the fact that the temperature does not meet the light emitting requirement when the emission laser is immediately started, the emission laser is controlled not to be immediately started, but to be started again to emit light when the temperature of the emission laser meets the light emitting requirement.
therefore, the waiting on period of the transmission laser needs to be timed. The waiting starting time length refers to the time length corresponding to the time from the power-on moment of the optical module to the starting moment of the emission laser.
And S3, acquiring the initial temperature value of the emitting laser detected by the temperature sensor.
In this embodiment, the temperature of the emitting laser is adjusted by using the temperature difference. After the optical module is powered on, the controller does not start the emission laser, so that the initial temperature value of the emission laser can be the same as the ambient temperature at the moment.
after the optical module is powered on, the temperature sensor only detects the temperature of the transmitting laser once, namely the initial temperature value. In this embodiment, the temperature sensor may be a thermistor, and the thermistor detects the resistance value and the voltage value of the transmitting laser in real time and sends the resistance value and the voltage value to the controller. An ADC (Analog-to-Digital Converter) is arranged in the controller, and the ADC is used for calculating according to the resistance value and the voltage value to obtain an initial temperature value of the transmitting laser.
S4, determining the delay time length according to the temperature difference value between the initial temperature value and the target temperature value; the target temperature value is a temperature value at a transmitting wavelength which enables the transmitting laser to stably transmit; the delay time is the time required for the TEC to control the temperature of the emitting laser to be stabilized at the target temperature value through temperature regulation.
The standard for adjusting the temperature of the emission laser by the TEC is a target temperature value, and each emission laser corresponds to one target temperature value, that is, in an environment of the target temperature value, the emission laser can emit a stable emission light wavelength.
The target temperature value corresponding to the emission laser is stored in the controller in advance, and the TEC adjusts the temperature of the emission laser in a temperature difference manner, so that the controller calculates a temperature difference value according to an initial temperature value and a target temperature value of the emission laser, so that the TEC adjusts the temperature of the emission laser according to the temperature difference value.
in order to ensure that the optical module can emit stable emitted light wavelength, and turn on the emitting laser as fast as possible to meet the power-on light-emitting standard of the optical module, a certain requirement is imposed on the optical module from the power-on time to the time of starting to emit light. That is, the temperature of the emission laser needs to be adjusted to be consistent with the target temperature value within the delay time, so that the power-on light-emitting standard of the optical module can be ensured.
Since the delay time is related to the adjustment degree of the TEC for adjusting the temperature of the emission laser, in this embodiment, the process of determining the delay time according to the temperature difference between the initial temperature value and the target temperature value of the emission laser includes:
and S41, calculating the temperature difference between the initial temperature value and the target temperature value.
And S42, matching the temperature difference with a preset comparison table according to the temperature difference, and searching the time length matched with the temperature difference in the preset comparison table to be used as the time delay time length.
different temperature difference values correspond to different delay time lengths, and the larger the temperature difference value is, the longer the delay time length is. In the embodiment, when the delay time is determined according to the temperature difference, a mode of matching with a preset comparison table is adopted. The preset comparison table comprises a plurality of comparison groups of temperature intervals and corresponding duration, and the corresponding relation between the temperature intervals and the duration can be determined according to the test.
If the temperature difference between the initial temperature value and the target temperature value calculated by the controller is within a certain temperature interval, the time length corresponding to the temperature interval can be used as the delay time length.
The value of the delay time length depends on the speed of controlling the temperature of the power-on TEC of the optical module and the fluctuation range of the wavelength of the emitted light which can be withstood by the emitting laser. While the range of the wavelength of the emitted light which the emitting laser withstands depends on the requirements of the different lasers, this range of wavelength fluctuations can be converted into a range of temperature fluctuations according to fig. 1. The speed of controlling the temperature of the power-on TEC of the optical module is influenced by the speed of adjusting the TEC, and is mainly influenced by the temperature difference between the target temperature value and the initial temperature value, and the larger the temperature difference is, the longer the time for adjusting the temperature to the target temperature value is. This temperature difference is the largest at power up and will be different due to the different ambient temperatures. For this reason, the present embodiment uses a preset lookup table to indicate the relationship between the temperature difference and the time length for adjusting to the target temperature value.
For example, the range of variation in emission wavelength that a certain emitting laser survives is converted into the range of temperature variation by fig. 1, denoted by Δ T; setting the target temperature value of the TEC to be 50 ℃; by testing a number of different ambient temperatures (i.e. the initial temperature values of the emitting laser) a waveform as shown in figure 4 is obtained.
in fig. 4, the abscissa is time in units of seconds; the ordinate is the temperature in degrees Celsius. The solid line (1) is the waveform of the TEC from power-up of the optical module to stabilization at the target temperature value (50 ℃). The dashed line (2) is the temperature fluctuation into the range where the emitting laser is caught. The dashed line (3) and the solid line (4) (from shallow to deep) represent respectively different ambient temperatures (i.e. initial temperature values of the emitting laser) when the optical module is powered on.
As can be seen from fig. 4, the environmental temperatures at the power-on time are different, that is, the starting point temperature of the TEC is different, that is, the difference between the starting point temperature and the target temperature is different, so that the time for adjusting the temperature of the TEC is different.
For example, if the ambient temperature is-40 ℃, then the laser survives the fluctuating need from power-up to emission: t "-0 (seconds); if the ambient temperature is-20 ℃, then the laser survives the fluctuating need from power-up to emission: t "-t 1 (seconds); if the ambient temperature is 0 ℃, then the laser survives the fluctuating need from power-up to emission: t "-t 2 (seconds); if the ambient temperature is 20 ℃, then the laser survives the fluctuating need from power-up to emission: t "-t 3 (seconds); if the ambient temperature is 40 ℃, then the laser survives the fluctuating need from power-up to emission: t "-t 4 (seconds); if the ambient temperature is 60 ℃, then the laser survives the fluctuating need from power-up to emission: t "-t 5 (seconds). Where T "refers to the moment at which the temperature fluctuation range comes within Δ T that the emitting laser can withstand.
and establishing a preset comparison table according to each environment temperature obtained by testing and the corresponding time length so as to determine the time delay time length according to the temperature difference value between the initial temperature value and the target temperature value of the emission laser.
And S5, generating a second opening instruction when the waiting opening time length is consistent with the delay time length.
In this embodiment, the standard for generating the second start instruction for controlling the start of the emission laser is that the wait start time is consistent with the delay time, so that in order to start the emission laser as fast as possible and meet the power-on and light-emitting standard of the optical module, in this embodiment, the TEC is required to complete temperature adjustment of the emission laser within the delay time, so that when the wait start time is consistent with the delay time, the temperature of the emission laser is consistent with a target temperature value, that is, the emission wavelength of the emission laser can be ensured to be stable without fluctuation.
The controller calculates a temperature difference value according to the initial temperature value and the target temperature value of the emission laser, and then sends the temperature difference value to the TEC control circuit so as to control the TEC to adjust the temperature of the emission laser according to the temperature difference value.
In order to ensure that the TEC can adjust the initial temperature value of the emission laser to the target temperature value within the delay time, as shown in fig. 5, in this embodiment, the TEC control circuit includes a TEC controller and a TEC driver, and a process of waiting for the turning-on time to be consistent with the delay time and generating a second turning-on instruction includes:
And S51, sending the delay time length and the temperature difference value to a TEC controller, wherein the TEC controller is used for determining the temperature adjustment step of the TEC according to the delay time length and the temperature difference value, and sending the temperature adjustment step of the TEC to a TEC driver so as to drive the TEC to adjust the temperature of the emitting laser according to the temperature adjustment step of the TEC.
And S52, when the temperature of the transmitting laser after temperature adjustment is consistent with the target temperature value, determining that the waiting starting time length is consistent with the delay time length, and generating a second starting instruction.
After the TEC controller receives the temperature difference value and the delay time, the temperature adjustment step of the TEC can be calculated by adopting a PID algorithm. The temperature of the TEC is adjusted to be stepped, the temperature of the transmitting laser is adjusted to be consistent with a target temperature value within a delay time according to the temperature adjustment step of the TEC, and the TEC controls the temperature to be increased or decreased. And the TEC driver drives the TEC to adjust the temperature value according to the temperature adjustment of the TEC in a stepping mode, so that the temperature of the emission laser gradually approaches to the target temperature value.
In order to ensure that the TEC can adjust the temperature value of the emission laser to the target temperature value and stabilize the temperature value at the target temperature value, the delay time is required to be greater than or equal to the adjustment time when the TEC adjusts the initial temperature value of the emission laser, that is, the controller drives the TEC control circuit, so that the TEC control circuit controls the TEC to complete the current temperature adjustment within a time less than the delay time.
in this embodiment, the temperature adjustment step of the TEC, which is adopted when the temperature of the emission laser is adjusted by the TEC, is determined according to the temperature difference and the delay time, so that when the temperature of the emission laser after temperature adjustment is consistent with a target temperature value, it may be determined that the waiting time for starting is consistent with the delay time, at this time, temperature adjustment of the emission laser is completed, and a second start instruction is immediately generated to start the emission laser, so that the emission laser may be started within the light emission standard of the optical module.
And S6, sending the second starting instruction to the emission laser to control the emission laser to start and emit the emission light wavelength suitable for the target temperature value.
The controller sends the second starting instruction to the transmitting laser, and after the transmitting laser is started, the working temperature of the transmitting laser is the target temperature value, so that the transmitting laser can transmit stable transmitting light wavelength, and the phenomenon that the transmitting laser is damaged due to large fluctuation of the light wavelength is avoided.
As can be seen from the foregoing technical solutions, in the method for preventing fluctuation of a wavelength of light emitted by an optical module when the optical module is powered on according to embodiments of the present invention, when the optical module is powered on, a controller only sends a first turn-on instruction to a TEC control circuit to control turning on of a TEC, and does not send a second turn-on instruction to a laser emitter, that is, the laser emitter is in a turn-off state after the optical module is powered on. The controller determines the delay time length according to the temperature difference value between the temperature of the emission laser in the closed state and the target temperature value, and when the waiting starting time length of the emission laser reaches the delay time length, the controller generates a second starting instruction to be directly sent to the emission laser to control the emission laser to be started. At this time, the temperature of the emitting laser at the time of starting emitting the light wavelength is close to or the same as the target temperature value, the temperature change is small, the light wavelength cannot be fluctuated or is small, and therefore the laser can be protected from being interfered by the temperature fluctuation and can emit the laser as fast as possible. Therefore, the method provided by the embodiment of the invention can avoid the phenomenon of optical wavelength fluctuation to protect the emitting laser, and can enable the optical module to output light with stable wavelength as fast as possible, thereby meeting the standard of the optical module.
As shown in fig. 6, an embodiment of the present invention provides an apparatus for preventing fluctuation of emitted light wavelength when an optical module is powered on, for performing the method for preventing fluctuation of emitted light wavelength when an optical module is powered on as shown in fig. 3, where the apparatus includes: the first starting instruction sending module 10 is configured to send a first starting instruction to the TEC control circuit when the optical module is powered on, where the TEC control circuit is configured to control the TEC to start according to the first starting instruction; the timing module 20 is configured to time a waiting start duration of the emission laser; an initial temperature value obtaining module 30, configured to obtain an initial temperature value of the emission laser detected by the temperature sensor; the delay time length determining module 40 is configured to determine a delay time length according to a temperature difference between the initial temperature value and the target temperature value; the target temperature value is a temperature value at a wavelength of emission light which enables the emission laser to emit stably; the delay time is the time required for the TEC to control the temperature of the emission laser to be stabilized at the target temperature value through temperature adjustment; a second start instruction generating module 50, configured to generate a second start instruction when the wait start duration is consistent with the delay duration; a second start instruction sending module 60, configured to send the second start instruction to the emission laser to control the emission laser to start, and emit an emission light wavelength that is adapted to the target temperature value.
Optionally, the delay duration determining module 40 includes: the temperature difference value calculating unit is used for calculating the temperature difference value between the initial temperature value and the target temperature value; and the delay time length determining unit is used for matching with a preset comparison table according to the temperature difference value, and searching the time length matched with the temperature difference value in the preset comparison table to be used as the delay time length.
Optionally, the TEC control circuit includes a TEC controller and a TEC driver; and the second opening instruction generating module 50 includes: the data sending unit is used for sending the delay time length and the temperature difference value to the TEC controller, the TEC controller is used for determining the temperature adjustment step of the TEC according to the delay time length and the temperature difference value, and sending the temperature adjustment step of the TEC to the TEC driver so as to drive the TEC to adjust the temperature of the emitting laser according to the temperature adjustment step of the TEC; and the second starting instruction generating unit is used for determining that the waiting starting time length is consistent with the delay time length when the temperature of the transmitting laser after temperature adjustment is consistent with the target temperature value, and generating a second starting instruction.
optionally, the delay time duration is greater than or equal to an adjustment time duration when the TEC adjusts the initial temperature value of the emission laser.
in a specific implementation, the present invention further provides a computer storage medium, where the computer storage medium may store a program, and the program may include some or all of the steps in each embodiment of the method for preventing the fluctuation of the emitted light wavelength when the optical module is powered on. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
the same and similar parts in the various embodiments in this specification may be referred to each other. In particular, as for the method embodiment for preventing the wavelength fluctuation of the emitted light when the optical module is powered on, since it is basically similar to the system embodiment, the description is simple, and the relevant points can be referred to the description in the method embodiment.
the above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (8)
1. a method for preventing the fluctuation of the wavelength of emitted light when an optical module is powered on is characterized by comprising the following steps:
When an optical module is powered on, sending a first starting instruction to a TEC control circuit, wherein the TEC control circuit is used for controlling the TEC to be started according to the first starting instruction;
timing the waiting starting time of the emission laser;
Acquiring an initial temperature value of the transmitting laser detected by the temperature sensor;
Determining a delay time length according to the temperature difference value between the initial temperature value and the target temperature value; the target temperature value is a temperature value at a wavelength of emission light which enables the emission laser to emit stably; the delay time is the time required for the TEC to control the temperature of the emission laser to be stabilized at the target temperature value through temperature adjustment;
when the waiting starting time length is consistent with the delay time length, generating a second starting instruction;
And sending the second starting instruction to the emission laser to control the emission laser to start and emit emission light wavelength suitable for the target temperature value.
2. the method of claim 1, wherein determining the delay time period according to the temperature difference between the initial temperature value and the target temperature value comprises:
Calculating the temperature difference value between the initial temperature value and the target temperature value;
and matching with a preset comparison table according to the temperature difference, and searching the time length matched with the temperature difference in the preset comparison table to be used as the time delay time length.
3. The method of claim 1, wherein the TEC control circuit comprises a TEC controller and a TEC driver; and the process of generating a second opening instruction by the consistency of the waiting opening duration and the delay duration comprises the following steps:
Sending the delay time length and the temperature difference value to the TEC controller, wherein the TEC controller is used for determining the temperature adjustment step of the TEC according to the delay time length and the temperature difference value, and sending the temperature adjustment step of the TEC to the TEC driver so as to drive the TEC to adjust the temperature of the emitting laser according to the temperature adjustment step of the TEC;
And when the temperature of the transmitting laser after temperature adjustment is consistent with the target temperature value, determining that the waiting starting time length is consistent with the delay time length, and generating a second starting instruction.
4. The method of claim 1, wherein the delay time period is greater than or equal to an adjustment time period for the TEC to adjust the temperature of the emitting laser.
5. An apparatus for preventing a fluctuation of a wavelength of light emitted from an optical module when the optical module is powered on, the apparatus comprising:
The first starting instruction sending module is used for sending a first starting instruction to the TEC control circuit when the optical module is powered on, and the TEC control circuit is used for controlling the TEC to be started according to the first starting instruction;
The timing module is used for timing the waiting starting time of the emission laser;
An initial temperature value acquisition module for acquiring an initial temperature value of the emission laser detected by the temperature sensor;
The delay time length determining module is used for determining the delay time length according to the temperature difference value of the initial temperature value and the target temperature value; the target temperature value is a temperature value at a wavelength of emission light which enables the emission laser to emit stably; the delay time is the time required for the TEC to control the temperature of the emission laser to be stabilized at the target temperature value through temperature adjustment;
The second starting instruction generating module is used for generating a second starting instruction when the waiting starting time length is consistent with the delay time length;
And the second starting instruction sending module is used for sending the second starting instruction to the emission laser so as to control the emission laser to be started and emit emission light wavelength suitable for the target temperature value.
6. the apparatus of claim 5, wherein the delay duration determining module comprises:
The temperature difference value calculating unit is used for calculating the temperature difference value between the initial temperature value and the target temperature value;
And the delay time length determining unit is used for matching with a preset comparison table according to the temperature difference value, and searching the time length matched with the temperature difference value in the preset comparison table to be used as the delay time length.
7. the apparatus of claim 5, wherein the TEC control circuit comprises a TEC controller and a TEC driver; and the second opening instruction generating module comprises:
the data sending unit is used for sending the delay time length and the temperature difference value to the TEC controller, the TEC controller is used for determining the temperature adjustment step of the TEC according to the delay time length and the temperature difference value, and sending the temperature adjustment step of the TEC to the TEC driver so as to drive the TEC to adjust the temperature of the emitting laser according to the temperature adjustment step of the TEC;
and the second starting instruction generating unit is used for determining that the waiting starting time length is consistent with the delay time length when the temperature of the transmitting laser after temperature adjustment is consistent with the target temperature value, and generating a second starting instruction.
8. The apparatus of claim 5, wherein the delay time duration is greater than or equal to an adjustment time duration for the TEC to adjust the temperature of the emitting laser.
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