TEC and SOA linkage control method for industrial-grade long-distance high-speed optical module

Abstract

The application discloses a TEC and SOA linkage control method of an industrial long-distance high-speed optical module, and comprises the following steps: in the module debugging stage, the working temperature range of the MCU is divided into N temperature stages from low to high; the current temperature of the MCU is compared with each temperature stage, and the TEC locking temperature is completed according to the comparison result; and the SOA gain under the TEC locking temperature of each stage is automatically adjusted based on the input light size. The application provides a TEC and SOA linkage control method of an industrial long-distance high-speed optical module, the TEC and the SOA are jointly controlled, the TEC is locked at different temperatures under different temperatures in the case of meeting the transmission performance requirement, and the module power consumption can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical module control. More particularly, the present application relates to a TEC and SOA linkage control method for an industrial-grade long-distance high-speed optical module used in long-distance transmission applications of high-speed optical modules in optical communication. BACKGROUND

[0002] In the process of optical module transmission, as the transmission distance becomes longer, the optical signal received by the receiving end of the optical module becomes smaller. When the optical signal reaching the receiving end of the optical module is small to a certain extent (optical receiving sensitivity), the correctness of the module in analyzing the code signal in the optical signal cannot meet the transmission requirements.

[0003] To solve this problem of optical modules in long-distance transmission, the existing technology adds SOA optical gain amplification to the receiving end of the optical module. The amplified optical signal reaching the receiving end of the module can meet the correct analysis of the code in the optical signal, and meet the normal transmission communication requirements. However, in actual optical module application scenarios, the distance is an uncertain factor, which is reflected in the optical module as the size of the optical signal received by the receiving end. If the SOA gain is too small, the amplified optical signal cannot meet the requirement of correctly analyzing the code in the optical signal. If the SOA gain is too large, the amplified optical signal may damage the optical devices in the optical module. Therefore, by adding an SOA control algorithm, the optical signal amplified by the SOA gain is just within the range of the module correctly analyzing the code in the optical signal.

[0004] In addition, the same gain current of the semiconductor optical amplifier SOA has differences in optical gain amplification at different temperatures. Therefore, by adding TEC temperature control, the SOA is kept at a constant temperature, which can ensure the stability of the SOA gain amplification of the optical signal. Different devices have different TEC refrigeration capacities. The devices with poor refrigeration capacity may cause unstable TEC lock temperature in industrial high temperature or low temperature, and the TEC lock temperature has an impact on the SOA gain. However, the existing technology does not consider this factor, so there are the following problems in the process of optical module transmission in the existing technology:

[0005] First, the existing SOA control algorithm of long-distance optical modules does not link with the TEC control algorithm. In the case of poor refrigeration effect of TEC devices, it cannot meet the requirements of industrial grade, and the module power consumption is too high.

[0006] Second, the existing TEC lock segmentation algorithm is the first segment of the lock, and the second segment is the PID algorithm lock. This method is only suitable for surge suppression in the case of starting at low temperature or high temperature of the module, and does not consider the normal working condition. SUMMARY

[0007] An object of the present application is to solve at least the above problems and / or deficiencies, and to provide at least the advantages described later.

[0008] To achieve these objects and other advantages and in accordance with the purpose of the application, as embodied and broadly described herein, there is provided a TEC and SOA linkage control method for an industrial-grade long-distance high-speed optical module, comprising:

[0009] Step one, in the module debugging stage, the working temperature range of MCU is divided into N temperature stages from low to high;

[0010] Step two, compare the current temperature of MCU with each temperature stage, and complete the TEC locking temperature according to the comparison result;

[0011] Step three, automatically adjust the SOA gain under the TEC locking temperature based on the input light size.

[0012] Preferably, in step one, when the TEC locking temperature is segmented, a corresponding low threshold I and a high threshold I are set for each temperature stage;

[0013] Wherein, the low threshold I and the high threshold I set for each two adjacent temperature stages have a crossing relationship to form hysteresis.

[0014] Preferably, in step two, the TEC locking temperature process is configured to include:

[0015] S20, judge whether the MCU temperature segment identifier is in the Nth temperature stage, if the judgment result is not, go to the N+1th temperature stage, otherwise further judge whether the MCU temperature is greater than the high threshold I set for the Nth temperature stage, if the judgment result is not, go to S22, otherwise go to S21;

[0016] S21, change the MCU temperature segment identifier to the N+1th temperature stage, lock the TEC to the target temperature of the N+1th temperature stage, and end the adjustment;

[0017] S22, judge whether the MCU temperature is less than the low threshold I set for the Nth temperature stage, if the judgment result is not, end the adjustment, otherwise change the MCU temperature segment identifier to the N-1th stage, lock the TEC to the target temperature of the N-1th temperature stage, and end the adjustment.

[0018] Preferably, in step three, the SOA gain is divided into K gain stages according to the actual transmission error code of the optical module for each MCU temperature segment;

[0019] Wherein, a corresponding RSSI low threshold II and a high threshold II are set for each gain stage, and the low threshold II and the high threshold II set for each two adjacent gain stages have a crossing relationship to form hysteresis.

[0020] Preferably, in step three, when the TEC is making a phase transition, if the TEC phase target changes greatly, then the TEC and SOA transition priorities of the algorithm are adjusted.

[0021] Preferably, in step three, the automatic adjustment process of the SOA gain is configured to include:

[0022] S30, after the TEC is locked, it is determined whether the SOA gain is in the j gain phase, if the result is not, then it enters the j+1 gain phase, otherwise it enters S31;

[0023] wherein, when J is equal to K, then it enters the light overload phase;

[0024] S31, it is determined whether the RSSI is greater than the high threshold II set in the j gain phase, if the result is not, then it goes to S33, otherwise it enters S32;

[0025] S32, the SOA gain is set to the gain value of the j+1 gain phase, and the adjustment is ended;

[0026] wherein, when J is equal to K, then the SOA gain is set to the light overload gain, and the adjustment is ended;

[0027] S33, it is determined whether the RSSI is less than the low threshold II set in the j phase, if the result is not, then the adjustment is ended;

[0028] S34, the SOA gain is set to the gain value of the j-1 gain phase, and the adjustment is ended;

[0029] wherein, when J is equal to 1, then the SOA gain is set to the no light phase, and the adjustment is ended.

[0030] Preferably, in S30, the adjustment process of the light overload phase is:

[0031] S301, it is determined whether the SOA gain is in the light overload phase, if the result is not, then it enters the no light phase;

[0032] S302, it is determined whether the RSSI is less than the low threshold III set in the light overload phase, if the result is not, then the adjustment is ended, otherwise the SOA gain is set to the K phase gain, and the adjustment is ended.

[0033] Preferably, in S34, the adjustment process of the no light phase is:

[0034] S341, it is determined whether the SOA gain is in the no light phase, if the result is not, then it enters the default setting phase;

[0035] S342. Determine whether RSSI is greater than the high threshold III set in the dark stage. If the result is no, end the adjustment.

[0036] S343. Set the SOA gain to stage 1 gain and end the adjustment.

[0037] The present invention has at least the following beneficial effects: In the control algorithm of the present invention, by jointly controlling TEC and SOA, TEC can be locked at different temperatures at different temperatures while meeting transmission performance requirements, and at the same time, the power consumption of the module can be reduced.

[0038] Furthermore, this invention can also realize a three-dimensional control method that links TEC temperature control with SOA gain control and input optical magnitude RSSI, meeting the transmission performance requirements of industrial-grade long-distance high-speed optical modules.

[0039] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating the adjustment process for temperature locking of the TEC according to the present invention.

[0041] Figure 2 for Figure 1 An enlarged view of the left half;

[0042] Figure 3 for Figure 1 A partially enlarged diagram of the right half;

[0043] Figure 4 This is a flowchart illustrating the segmented adjustment of SOA gain in this invention.

[0044] Figure 5 for Figure 4 Enlarged view of the left half of the upper section;

[0045] Figure 6 for Figure 4 Enlarged view of the right half of the upper section;

[0046] Figure 7 for Figure 4 Enlarged view of the middle section;

[0047] Figure 8 for Figure 4 Enlarged diagram of the lower section. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0049] The application provides a TEC and SOA linkage control method of an industrial-grade long-distance high-speed optical module, which adjusts segments in real time during normal operation of the module, effectively suppresses surges during high and low temperature start, and reduces module power consumption during high and low temperature.

[0050] 1. The TEC locking temperature is processed in multiple segments according to the MCU Chip temperature, and the SOA gain is automatically adjusted according to the input light size under the TEC locking temperature of each segment.

[0051] 2. The SOA automatic adjustment sets a high threshold and a low threshold under the current SOA gain under the condition of meeting the module transmission error code requirement, and the SOA gain current is compared with the high and low thresholds under the current input light RSSI and the current SOA gain, so as to realize the automatic adjustment of the SOA gain according to the input light RSSI.

[0052] Specifically, the TEC adjustment part includes:

[0053] During the module debugging stage, the MCU temperature is divided into multiple stages according to the actual situation, appropriate high and low temperature thresholds are set in each stage, and the high and low thresholds set by each two adjacent stages have a certain intersection relationship, forming hysteresis, so that the jump during stage conversion is avoided.

[0054] The specific process of TEC adjustment is as follows: Figures 1-3

[0055] 1. Stage:

[0056] Step 1: Determine whether the MCU temperature segment identifier is in the first stage; if not, go to the second stage.

[0057] Step 2: If yes, determine whether the MCU temperature is greater than the high threshold set in the second stage; if not, end the adjustment.

[0058] Step 3: If yes, the MCU temperature segment identifier becomes 2 stage, the TEC is locked as the target temperature of 2 stage, and the adjustment is ended.

[0059] 2. Stage:

[0060] Step 1: Determine whether the MCU temperature segment identifier is in the second stage; if not, go to the third stage.

[0061] Step 2: If yes, determine whether the MCU temperature is greater than the high threshold set in the second stage; if not, go to Step 4.

[0062] Step 3: If yes, the MCU temperature segment identifier becomes 3 stage, the TEC is locked as the target temperature of 3 stage, and the adjustment is ended.​

[0063] Step4: If not, then end adjustment.

[0064] Step5: If yes, then MCU temperature segment identification becomes 1 stage, TEC is locked to 1 stage target temperature, and end adjustment.

[0065] 3 stage:

[0066] ––––

[0067] N stage:

[0068] Step1: If not, then go to N-K (default stage) stage.

[0069] Step2: If not, then end adjustment.

[0070] Step3: If yes, then MCU temperature segment identification becomes N-1 stage, TEC is locked to N-1 stage target temperature, and end adjustment.

[0071] SOA adjustment part is as follows Figures 4-8 :

[0072] After the MCU temperature is divided into multiple stages in the module debugging stage, the SOA gain is also divided into multiple stages according to the actual transmission error code of the module under each MCU temperature segment, and appropriate RSSI high and low temperature thresholds are set in each SOA stage. There is a certain intersection relationship between the high and low thresholds set by each two adjacent stages, forming hysteresis, which avoids jumping when the stage is converted.

[0073] When the TEC performs stage transition, if the TEC stage target changes greatly, the module transmission may produce error code, at this time, the TEC and SOA transition priority of the algorithm can be adjusted, according to the characteristics of SOA gain with temperature change, when the temperature increases, the SOA gain efficiency decreases, if the TEC low temperature stage changes to high temperature stage, the SOA gain can be first transferred to the SOA gain corresponding to the next TEC high temperature stage, and then the TEC is transferred to the next high temperature stage.

[0074] SOA adjustment specific algorithm flow:

[0075] Step1: If not, then end adjustment.

[0076] Step2: If yes, then go to 1 stage.

[0077] 1 stage:

[0078] Step 1: Determine if SOA gain is stage 1, if not, go to stage 2.

[0079] Step 2: If yes, determine if RSSI is greater than high threshold set in stage 1, if not, go to Step 4.

[0080] Step 3: If yes, set SOA gain to stage 2 gain, end adjustment.

[0081] Step 4: Determine if RSSI is less than low threshold set in stage 1, if not, end adjustment.

[0082] Step 5: If yes, set SOA gain to no light gain, end adjustment.

[0083] Stage 2:

[0084] Step 1: Determine if SOA gain is stage 2, if not, go to stage 3.

[0085] Step 2: If yes, determine if RSSI is greater than high threshold set in stage 2, if not, go to Step 4.

[0086] Step 3: If yes, set SOA gain to stage 3 gain, end adjustment.

[0087] Step 4: Determine if RSSI is less than low threshold set in stage 2, if not, end adjustment.

[0088] Step 5: If yes, set SOA gain to stage 1 gain, end adjustment.

[0089] ––––

[0090] Stage N:

[0091] Step 1: Determine if SOA gain is stage N, if not, go to light overload stage.

[0092] Step 2: If yes, determine if RSSI is greater than high threshold set in stage N, if not, go to Step 4.

[0093] Step 3: If yes, set SOA gain to light overload gain, end adjustment.

[0094] Step 4: Determine if RSSI is less than low threshold set in stage N, if not, end adjustment.

[0095] Step 5: If yes, set SOA gain to N-1 stage gain, end adjustment.

[0096] Light overload stage:

[0097] Step 1: Determine whether the SOA gain is in the light overload stage, if not, enter the no light stage.

[0098] Step 2: If yes, determine whether RSSI is less than the low threshold set in the light overload stage, if not, end adjustment.

[0099] Step 3: If yes, set SOA gain to N stage gain, end adjustment.

[0100] No light stage:

[0101] Step 1: Determine whether the SOA gain is in the no light stage, if not, enter the N-K (default setting stage) stage.

[0102] Step 2: If yes, determine whether RSSI is greater than the high threshold set in the no light stage, if not, end adjustment.

[0103] Step 3: If yes, set SOA gain to 1 stage gain, end adjustment.

[0104] The scheme of the present application improves yield problems caused by TEC efficiency through TEC multi-stage temperature locking, reduces module power consumption, and simplifies the processing method of monitoring and calibration of the receiving end by multi-stage processing of SOA gain, which can effectively solve the following technical problems:

[0105] Solve the problem of light overload when high-speed optical modules are transmitted over long distances to the receiving end;

[0106] Solve the problem of high and low temperature lockout caused by TEC refrigeration efficiency of industrial high-speed optical modules;

[0107] Improve the module yield problem caused by TEC refrigeration efficiency;

[0108] Reduce the power consumption of the module at high and low temperatures.

[0109] The above scheme is only a description of a preferred example, but is not limited thereto. In the implementation of the present application, appropriate substitution and / or modification can be made according to user needs.

[0110] The number of devices and the scale of processing described herein are used to simplify the description of the present application. Applications, modifications and variations of the present application are obvious to those skilled in the art.

[0111] While embodiments of the application have been disclosed in connection with the above specification, it will be apparent to those skilled in the art that numerous modifications can be made thereto without departing from the scope of the application as set forth in the claims and equivalents thereof. Accordingly, it is intended that all such modifications come within the scope of the claims and equivalents thereof.

Claims

1. A TEC and SOA linkage control method of an industrial-grade long-distance high-speed optical module, characterized in that, The application relates to a method for automatically adjusting SOA gain of an optical module based on input light size, and belongs to the field of optical communication. Step one: in the module debugging stage, the working temperature range of the MCU is divided into N temperature stages from low to high; Step two: the current temperature of the MCU is compared with each temperature stage, and the TEC locking temperature is completed according to the comparison result; Step three: the SOA gain under the TEC locking temperature of each stage is automatically adjusted based on the input light size; In step one, when the TEC locking temperature is segmented, a corresponding low threshold I and a high threshold I are set for each temperature stage; Wherein, the low threshold I and the high threshold I set for each two adjacent temperature stages have a crossing relationship to form hysteresis; In step three, the SOA gain is divided into K gain stages according to the actual transmission error code of the optical module for each MCU temperature stage; Wherein, a corresponding RSSI low threshold II and a high threshold II are set for each gain stage, and the low threshold II and the high threshold II set for each two adjacent gain stages have a crossing relationship to form hysteresis; In step three, when the TEC stage target changes greatly during the stage transition of the TEC, the TEC and SOA transition priority of the algorithm is adjusted; In step three, the automatic adjustment process of the SOA gain is configured to include: S30, after the TEC is locked, it is judged whether the SOA gain is in the j gain stage, if the judgment result is not, then enter the j+1 gain stage, otherwise enter S31; Wherein, when J equals K, then enter the light overload stage; S31, judge whether the RSSI is greater than the high threshold II set in the j gain stage, if the judgment result is not, then go to S33, otherwise enter S32; S32, set the SOA gain to the gain value of the j+1 gain stage, and end the adjustment; Wherein, when J equals K, then set the SOA gain to the light overload gain, and end the adjustment; S33, judge whether the RSSI is less than the low threshold II set in the j stage, if the judgment result is not, then end the adjustment, otherwise enter S34; S34, set the SOA gain to the gain value of the j-1 gain stage, and end the adjustment; Wherein, when J equals 1, then set the SOA gain to the light stage, and end the adjustment.

2. The TEC and SOA linkage control method of the industrial-grade long-distance high-speed optical module according to claim 1, wherein, In step two, the process of the TEC locking temperature is configured to include: S20, judge whether the MCU temperature stage identifier is in the N temperature stage, if the judgment result is not, then go to the N+1 temperature stage, otherwise further judge whether the MCU temperature is greater than the high threshold I set in the N temperature stage, if the judgment result is not, then go to S22, otherwise go to S21; S21, change the MCU temperature stage identifier to the N+1 temperature stage, lock the TEC to the target temperature of the N+1 temperature stage, and end the adjustment; S22, judge whether the MCU temperature is less than the low threshold I set in the N temperature stage, if the judgment result is not, then end the adjustment, otherwise change the MCU temperature stage identifier to the N-1 stage, lock the TEC to the target temperature of the N-1 temperature stage, and end the adjustment.

3. The TEC and SOA linkage control method of the industrial-grade long-distance high-speed optical module according to claim 1, wherein, In S30, the adjustment process of entering the light overload stage is: S301, judging whether the SOA gain is in the light overload stage, if the judging result is no, entering the no light stage; S302, judging whether the RSSI is less than the low threshold III set in the light overload stage, if the judging result is no, ending the adjustment, otherwise setting the SOA gain as the k stage gain, and ending the adjustment.

4. The TEC and SOA linkage control method of the industrial-grade long-distance high-speed optical module according to claim 1, wherein, In S34, the adjustment flow in the no light stage is: S341, judging whether the SOA gain is in the no light stage, if the judging result is no, entering the default setting stage; S342, judging whether the RSSI is greater than the high threshold III set in the no light stage, if the judging result is no, ending the adjustment; S343, setting the SOA gain as the 1 stage gain, and ending the adjustment.

Images