CN114257301A - Method for improving optical module optical signal loss debugging precision - Google Patents

Abstract

The invention discloses a method for improving the debugging precision of optical module optical signal loss, which comprises the following steps: firstly, ADC sampling is carried out on received signal strength indication RSSI of an optical receiving assembly ROSA through a driver chip or an MCU chip, and sampling data is used as a sample to simulate the debugging point range of loss assertion LOSA of an optical signal; adjusting incident light power to enable an ADC value sampled by the RSSI signal to be located in a debugging point range of a set LOSA, writing an initial default value of driver optical signal LOSs LOS into a register, and starting debugging by adopting a stepping method; and step three, in the debugging process, immediately stopping when the LOS signal is converted from the low potential to the high potential, writing the current LOS setting value into a register to finish debugging, otherwise, not modifying the LOS value in the register.

Description

Method for improving optical module optical signal loss debugging precision

Technical Field

The present invention relates to the field of optical communications. More specifically, the present invention relates to a method for improving the debugging accuracy of optical signal loss of an optical module.

Background

An Optical module RX LOS is a very important performance index of an Optical module, and is used to indicate whether the received Optical power of a ROSA (receiving Optical Sub-assembly, Optical receiving component) is lower than a set threshold, and two methods for implementing LOS alarm, namely, an average Optical power LOS and a signal LOS, are summarized according to the design and register configuration of the Optical module. The average optical power LOS is determined according to the magnitude of the input optical power, and the signal LOS is determined according to the amplitude of the signal in the input optical power.

The conventional optical module RX LOS debugging is performed by using a dichotomy for given optical power to debug an LOS (LOSs of signal Assert), and the RX LOS debugging is performed by using the method, because RSSI signals correspondingly generated by different ROSAs under the same optical power are different, the setting value of a debugged LOS register is greatly different, so that the LOSs of signal (LOSs of signal Assert) and the LOSs of signal (LOSs of signal Hysteresis) of an optical module are greatly fluctuated, and even the LOSs of signal (LOSs of signal Hysteresis) and the LOSs of signal (LOSs of signal) are not accordant, so that the efficiency and yield of the module debugging test are influenced.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a method for improving optical module optical signal loss debugging accuracy, comprising:

firstly, ADC sampling is carried out on received signal strength indication RSSI of an optical receiving assembly ROSA through a driver chip or an MCU chip, and sampling data is used as a sample to simulate the debugging point range of loss assertion LOSA of an optical signal;

adjusting incident light power to enable an ADC value sampled by the RSSI signal to be located in a debugging point range of a set LOSA, writing an initial default value of driver optical signal LOSs LOS into a register, and starting debugging by adopting a stepping method;

and step three, in the debugging process, immediately stopping when the LOS signal is converted from the low potential to the high potential, writing the current LOS setting value into a register to finish debugging, otherwise, not modifying the LOS value in the register.

Preferably, the method further comprises the following steps:

and step four, after LOS debugging is finished, testing by adopting a large step and small step method to obtain the true values of LOSA and the LOSD release by the optical signal LOSs alarm.

Preferably, the large Step in the test process is called Step0, the backward Step is called Step1, and the small Step is called Step2, and the test Step is configured to include:

s40, using Step0 to roughly measure the LOSA and LOSD,

s41, using the rough measuring point + Step1 of the optical power LOSA as the starting point, and using the Step2 testing starting point of the LOSA to perform the fine measurement, using the LOSD rough measuring point-Step 1 as the starting point, and using the Step2 testing starting point of the LOSD to perform the fine measurement, and finally obtaining the true values of the LOSA and the LOSD.

Preferably, in S41, before the coarse measurement point + Step1 of the LOSA is taken as the starting point, the optical power of the ROSA is set to-15 dbm to make the optical module not report the LOS;

before the LOSD coarse measurement point Sep1 is used as a starting point, the optical power of the ROSA is set to-30 dbm to enable the optical module to report LOS.

The invention at least comprises the following beneficial effects: the invention carries out LOS debugging based on RSSI signals and uses a stepping method to carry out debugging test, thereby effectively debugging the LOS function of the optical module, solving most LOS debugging test problems in the current optical module test and improving the test precision, reliability and efficiency.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic flow chart of LOS debugging using the method of the present invention;

FIG. 2 is a schematic flow chart of a LOS test performed by the method of the present invention;

fig. 3 is a schematic diagram of an optical power LOS;

FIG. 4 is a diagram illustrating optical power LOS manual debugging record;

FIG. 5 is an enlarged schematic view of the left half of FIG. 4;

FIG. 6 is an enlarged view of the right half of FIG. 4;

FIG. 7 is a schematic diagram of Step-by-Step verification data selection;

FIG. 8 is a comparison graph of LOS data tested by the conventional and new versions of the method;

fig. 9 is a diagram of the register mapping in this embodiment.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

The invention provides a debugging method for improving consistency of optical module RX LOS (LOSs of Signal), which can effectively improve debugging yield of an optical module and effectively control range of the RX LOS so as to improve consistency of products.

As shown in fig. 3, the average optical power LOS of the PIN-TIA ROSA is obtained by comparing a voltage Signal (CPn +) of an input RSSI (Received Signal Strength Indicator) with a set threshold (CPn-), transmitting a comparison result to the MCU for processing, and finally reporting the comparison result by the MCU.

The RSSI signal transmitted by ROSA is subjected to ADC sampling through a driver or an MCU, the analog signal is converted into a digital signal, the RSSI signal and the light power change can be more visually seen and quantized through the conversion into the digital signal, and the LOSH voltage difference is a smaller range according to the theory, so that the scheme is possible to implement, and the manual analog debugging and testing condition is shown in figures 3-5;

referring to fig. 1, a suitable range of the LOSA debugging point is drawn up according to data sampled by the ADC as a sample, and during debugging, the RSSI signal sampling ADC value is located in the range of the set LOSA debugging point by adjusting incident light power, then a driver LOS register value is written in and debugging is started (according to different driver chip models, there is a difference between register setting and debugging), while in practical application, after the debugging point range of the LOSA is determined, the LOSD is determined relative to the LOSA (as in the present scheme, the LOSD is determined relative to the LOSA in a range of-15 dbm to-30 dbm), the debugging is performed by a stepping method, so that the LOS signal is immediately stopped after being converted from a low potential to a high potential, and the current register value is written in, then LOS test is performed, in practical application, the value of the LOS register corresponds to the threshold value of the MCU or the driver sampling RSSI signal, taking MACOM 37030 as an example, the register mapping relationship is as shown in fig. 9: if the bit value is 5, the corresponding binary system is 1001, the corresponding threshold value is 70mVpp, and LOS is reported immediately when the detected RSSI signal is lower than the value;

similarly, a stepping method is adopted, and the difference is that the LOS test adopts a large stepping and small stepping method to carry out a true value test, for the convenience of resolution, the large stepping is called Step0, the backstepping is called Step1, and the small stepping is called Step2, the test flow is shown in the figure, Step0 is used for carrying out rough test on the LOSA and the LOSD, and after the rough test is finished, the optical power of the ROSA is further set to-15 dbm (larger incident light) so that the optical module does not report the LOS; performing LOSA small-Step fine measurement by taking the LOSA coarse measurement point + Step1 as a starting point to finally obtain a true value of the LOSA;

and similarly, setting the optical power of the ROSA to-30 dbm (small incident light) to enable the optical module not to report LOS, and performing small-Step LOSD fine measurement by taking a LOSD coarse measurement point-Step 1 as a starting point to finally obtain a true value of the LOSD.

As shown in fig. 7, the manual test data verifies that the selection of the Step0, Step1 and Step2 values is wrong when the true values of LOSA and LOSD approach the decision point when Step1 is 0.5dBm, and the decision is accurate and takes a short time when Step1 is 1.0dBm, so that Step1 is 1.0dBm, and the larger Step0 is from the viewpoint of test data, the closer the rough test result is to the manual test value, but the more time is taken, and the adjustment can be performed according to actual needs in order to balance the test accuracy and the test efficiency.

The scheme is used for realizing the test by the test machine ATE shown in the figures 1-2, the traditional dichotomy test data and the new version test data of the ATE are similar to each other in the aspect of figure 8, and the test result of the ATE is similar to the test result of the manual simulation test, but the traditional dichotomy test is far away, and even the result cannot be debugged, so that the test precision, the reliability and the efficiency can be effectively improved by using the scheme.

The above embodiments are merely illustrative of a preferred embodiment, but not limiting. When the invention is implemented, appropriate replacement and/or modification can be carried out according to the requirements of users.

The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.

Claims (4)

1. A method for improving the debugging precision of optical signal loss of an optical module is characterized by comprising the following steps:

firstly, ADC sampling is carried out on received signal strength indication RSSI of an optical receiving assembly ROSA through a driver chip or an MCU chip, and sampling data is used as a sample to simulate the debugging point range of loss assertion LOSA of an optical signal;

adjusting incident light power to enable an ADC value sampled by the RSSI signal to be located in a debugging point range of a set LOSA, writing an initial default value of driver optical signal LOSs LOS into a register, and starting debugging by adopting a stepping method;

and step three, in the debugging process, immediately stopping when the LOS signal is converted from the low potential to the high potential, writing the current LOS setting value into a register to finish debugging, otherwise, not modifying the LOS value in the register.

2. The method for improving the debugging accuracy of optical signal loss of an optical module according to claim 1, further comprising:

and step four, after LOS debugging is finished, testing by adopting a large step and small step method to obtain the true values of LOSA and the LOSD release by the optical signal LOSs alarm.

3. The method for improving the debugging precision of the optical signal loss of the optical module as claimed in claim 2, wherein a large Step in the testing process is called Step0, a Step back is called Step1, and a small Step is called Step2, and the testing Step is configured to include:

s40, using Step0 to roughly measure the LOSA and LOSD,

s41, using the rough measuring point + Step1 of the optical power LOSA as the starting point, and using the Step2 testing starting point of the LOSA to perform the fine measurement, using the LOSD rough measuring point-Step 1 as the starting point, and using the Step2 testing starting point of the LOSD to perform the fine measurement, and finally obtaining the true values of the LOSA and the LOSD.

4. The method as claimed in claim 3, wherein in S41, before the coarse measurement point + Step1 of the LOSA is taken as a starting point, the optical power of the ROSA is set to-15 dbm to make the optical module not report the LOS;

before the LOSD coarse measurement point Sep1 is used as a starting point, the optical power of the ROSA is set to-30 dbm to enable the optical module to report LOS.

Images