CN110266378B

CN110266378B - Method and device for testing isolation between light receiving device channels on line, electronic equipment and computer readable storage medium

Info

Publication number: CN110266378B
Application number: CN201910454534.4A
Authority: CN
Inventors: 高国祥; 何伟强; 谢艺力; 肖爱长
Original assignee: Guangdong Ruigu Optical Network Communication Co ltd
Current assignee: Guangdong Ruigu Optical Network Communication Co ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2021-10-29
Anticipated expiration: 2039-05-29
Also published as: CN110266378A

Abstract

The invention relates to a method for testing the isolation between channels of a light receiving device on line, an electronic device and a computer readable storage medium. The method comprises the following steps: selecting a channel Y, and acquiring a band-pass left cut-off wavelength lambda L, a band-pass right cut-off wavelength lambda R and a wavelength lambda C at a band-pass middle section of the channel Y; calculating responsivities ResYL, ResYR and ResYC generated by the wavelengths lambda L, lambda R and lambda C on the channel Y respectively; and judging the isolation degree between the light receiving device channels according to the difference between the responsivities ResYC and ResYL and/or the difference between the responsivities ResYC and ResYR. The on-line testing method can monitor the inter-channel isolation of the whole light receiving device by only selecting a certain channel and testing the responsivity of 3 wavelength points, is simple, is convenient to operate, can improve the production efficiency and is beneficial to mass production.

Description

Method and device for testing isolation between light receiving device channels on line, electronic equipment and computer readable storage medium

Technical Field

The present invention relates to the field of optical fiber communications, and in particular, to a method and an apparatus for testing isolation between channels of an optical receiver device on line, an electronic device, and a computer-readable storage medium.

Background

The current multi-channel high-speed light receiving device, especially LWDM device, has certain requirement for the isolation between channels, and the isolation between the channels of the light receiving device needs to be tested in the production stage to judge whether the light receiving device is qualified or not. If the isolation is tested again in the case where the assembly bonding of the light receiving device has been completed, the measured defective products need to be reworked. In order to reduce the rework rate, it is common practice to introduce in-line isolation testing during the assembly welding step.

Referring to fig. 1, fig. 1 shows Demux coating spectral lines in a typical 4-channel LWDM device, Lane 0-3 in the figure represents 4 channels, and in a conventional online isolation degree test method, the short-cut wavelength isolation degree of a Lane0 channel to a Lane1 channel is defined as Iso (0-1L) ═ 10 × log (Res12/max (Res01, Res02)), Res12 in the formula refers to the responsivity, which specifically points to the responsivity obtained by dividing the photocurrent received by the PD in the Lane1 channel by the laser power when a laser meeting the wavelength requirement range of the Lane2 channel is input to the common input port of the light receiving device, and Res01 and Res02 are defined by analogy. For the sake of brevity, the laser light in the wavelength range of the channel will be referred to as channel wavelength light hereinafter.

As can be seen from the above formula, when the conventional online isolation test method is used to test the isolation between 4 channels in the spectral line in fig. 1, at least eight wavelength points λ 1 to λ 8 need to be tested, and 2 × N-1 — 6 isolation data needs to be measured, and a total of 4 × N-2 responsivity data needs to be read, where N represents the number of channels of the light receiving device, and where N is 4. Such a test method takes a long time and greatly reduces the production efficiency, and is therefore not favorable for mass production of light receiving devices.

Disclosure of Invention

The invention aims to reduce the time consumption for testing the isolation between the channels of the light receiving device on line.

According to an aspect of the present invention, there is provided a method for on-line testing of inter-channel isolation of light receiving devices, comprising the following steps performed in sequence:

selecting a channel Y, and acquiring a band-pass left cut-off wavelength lambda L, a band-pass right cut-off wavelength lambda R and a wavelength lambda C at a band-pass middle section of the channel Y;

calculating responsivities ResYL, ResYR and ResYC generated by the wavelengths lambda L, lambda R and lambda C on the channel Y respectively;

and judging the isolation degree between the light receiving device channels according to the difference between the responsivities ResYC and ResYL and/or the difference between the responsivities ResYC and ResYR.

Optionally, the difference specifically means: the ratio between responsivity ResYL and responsivity ResYC; and/or the ratio between the responsivity ResYR and the responsivity ResYC.

Optionally, the method further comprises: controlling ResYL/ResYC < 1-x% and ResYR/ResYC < 1-x%, thereby satisfying the isolation requirement between the light receiving device channels, wherein x is a set value.

Optionally, the wavelength λ C is in particular a center wavelength.

According to another aspect of the present invention, there is provided an apparatus for on-line testing of inter-channel isolation of light receiving devices, comprising the following modules performed in sequence:

the wavelength acquisition module is suitable for selecting a channel Y and acquiring a band-pass left cut-off wavelength lambda L, a band-pass right cut-off wavelength lambda R and a wavelength lambda C at a band-pass middle section of the channel Y;

the responsivity calculation module is suitable for calculating responsivities ResYL, ResYR and ResYC generated by the wavelengths lambda L, lambda R and lambda C to the channel Y respectively;

and the isolation test module is suitable for judging the isolation between the light receiving device channels according to the difference between the responsivity ResYC and/or ResYL and the difference between the responsivity ResYC and ResYR.

Optionally, the system further comprises a monitoring module adapted to: controlling ResYL/ResYC < 1-x% and ResYR/ResYC < 1-x%, thereby satisfying the isolation requirement between the light receiving device channels, wherein x is a set value.

Optionally, the wavelength λ C is in particular a center wavelength.

In accordance with another aspect of the present invention, there is provided an electronic apparatus, wherein the electronic apparatus includes:

a processor; and the number of the first and second groups,

a memory arranged to store computer executable instructions that, when executed, cause the processor to perform the method described above.

According to another aspect of the present invention, there is provided a computer readable storage medium, wherein the computer readable storage medium stores one or more programs which, when executed by a processor, implement the above-described method.

Has the advantages that:

the on-line testing method can monitor the inter-channel isolation of the whole light receiving device by only selecting a certain channel (such as lane0 channel) and testing the responsivity of 3 wavelength points, and has the advantages of simple testing method, convenient operation, improved production efficiency and contribution to mass production.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 shows the Demux coating lines in a typical 4-channel LWDM device;

FIG. 2 shows a schematic representation of the shift of the Demux coating spectral line as a function of angle of incidence;

FIG. 3 is a flow chart illustrating a method for on-line testing of inter-channel isolation of light-receiving devices according to one embodiment of the present invention;

FIG. 4 shows the coating lines of the simplified lane0 channel;

FIG. 5 is a schematic structural diagram of an apparatus for on-line testing of inter-channel isolation of light-receiving devices according to an embodiment of the present invention;

FIG. 6 shows a schematic structural diagram of an electronic device according to one embodiment of the invention;

fig. 7 shows a schematic structural diagram of a computer-readable storage medium according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The applicant has found that in the field of optical communications, the channel of a light receiving device has two characteristics:

firstly, the passband isolation band of a channel and the passband isolation band of an adjacent channel are correlated, the characteristic can be referred to fig. 1, λ 2 in fig. 1 is the passband right cut-off wavelength of lane0 channel, according to the requirement of the existing CWDM, DWDM or LWDM communication protocol, the wavelength λ 2 must be on the designed isolation band of lane1 channel, that is, the responsivity a1 generated by the receiving PD of lane1 channel when laser light corresponding to the wavelength λ 2 is input to the common input port of the optical receiving device, and the responsivity a2 generated by the receiving PD of lane1 channel when the passband wavelength light of lane1 channel is input to the common input port, these two responsivities a1 and a2 must meet a certain isolation requirement, and thus it can be seen that there is a correlation characteristic between the passband isolation band of the channel and the passband isolation band of the adjacent channel;

secondly, the change of the incident angle of the input laser and the optical filter in the channel can bring about the integral translation of the spectral line, because the laser has the incident angle with the optical filter in the channel when being input into the channel, when the incidence angle is smaller, the film coating spectral lines are shifted to the right as a whole, and when the incidence angle is larger, the film coating spectral lines are shifted to the left as a whole, which can be understood with reference to fig. 2, in fig. 2, the line of target represents the coating spectral line that the acceptable light-receiving device should have, when the incident angle is reduced, the whole coating spectral line is shifted to the right, the coating spectral line is changed into a small line, since the bandpass of a channel (i.e., the spec line in the figure) is fixed, this will sacrifice the isolation of the laser corresponding to the left cut-off wavelength of the passband of the channel from the adjacent left channel, and conversely, when the incidence angle is increased, the whole coating spectral line is shifted to the left, the coating spectral line becomes a bigger line, the isolation of the laser corresponding to the passband right cutoff wavelength of the channel from its adjacent right channel is sacrificed. Hereinafter, the laser corresponding to the passband left cut-off wavelength of the channel is simply referred to as passband left cut-off wavelength light, and the laser corresponding to the passband right cut-off wavelength of the channel is simply referred to as passband right cut-off wavelength light.

Based on the two characteristics, a method for testing the inter-channel isolation of the light receiving device on line is provided, which is shown in fig. 3 and comprises the following steps that are executed in sequence:

s11, selecting a channel Y, and acquiring a band-pass left cut-off wavelength lambda L, a band-pass right cut-off wavelength lambda R and a wavelength lambda C at a band-pass middle section of the channel Y;

fig. 4 shows the coating spectral lines of a simplified lane0 channel, an example is given by selecting channel Y as lane0 channel, see fig. 4, where λ C and λ L and λ R are the left and right cut-off points of the passband, respectively, and λ C is the channel center wavelength specified by the CWDM, DWDM or LWDM communication protocol, redefined on the coating spectral lines of lane0 channel.

Step S12 of fig. 3, calculating responsivities ResYL, ResYR, ResYC respectively generated by the wavelengths λ L, λ R, λ C for the channel Y;

the channel Y is a Lane0 channel, when the responsivity of the wavelength lambda L to the Lane0 channel is calculated, laser corresponding to the wavelength lambda L is input to a common input port of the light receiving device, then the photocurrent received by the PD in the Lane0 channel is read by an ammeter or a power supply meter, the power of the laser corresponding to the wavelength lambda L is measured by the dynamometer, and the responsivity Res0L can be obtained by dividing the photocurrent by the power. The responsivity calculation process of Res0R and Res0C is similar to Res0L, and is not described in detail here.

S13, determining the isolation between the light receiving device channels according to the difference between the responsivities ResYC and ResYL and/or the difference between the responsivities ResYC and ResYR.

It should be noted that, because the wavelength λ C is the central wavelength of the channel, it is not affected by the shift of the coating spectral line, therefore, the responsivity ResYC generated by the wavelength λ C to the lane0 channel is used as a reference value, when the coating spectral line shifts, the difference between the responsivity ResYL and the responsivity ResYC is reflected according to the magnitude of the ratio between the responsivity ResYL and the responsivity ResYC, the degree of the rightward shift of the coating spectral line of the lane0 channel is judged according to the difference, then the degree of the rightward shift between the lane0 channel and the adjacent channel is considered according to the shift degree, and the degree of the rightward shift of the coating spectral line is controlled within the allowable range of the industrial error by controlling Res 590/Res 0C < 1-x% and Res 0/R/Res 0C < 1-x%, so that the degree of the rightward shift of the coating spectral line between the lane0 channel and the adjacent channel meets the requirement; similarly, the left translation degree of the coating spectral line of the lane0 channel is judged according to the ratio of the responsivity ResYR to the responsivity ResYC, and the left translation degree of the coating spectral line is controlled within the range allowed by industrial errors by controlling Res0L/Res0C to be less than 1-x% and Res0R/Res0C to be less than 1-x%, so that the isolation degree between the lane0 channel and the adjacent channel meets the requirement. In the formula, x is an unfixed number, and is generally a number between 5 and 15 according to the summary adjustment of the small batch isolation test data.

Therefore, only one channel (such as lane0 channel) needs to be selected to test the responsivity of 3 wavelength points, the isolation between the channels of the whole light receiving device can be monitored, the test method is simple, the operation is convenient, the production efficiency can be improved, and the mass production is facilitated.

Fig. 5 is a schematic structural diagram showing an apparatus for on-line testing of inter-channel isolation of light receiving devices according to an embodiment of the present invention. As shown in fig. 5, the apparatus of the embodiment of the present invention includes:

the wavelength obtaining module 51 is adapted to select a channel Y, and obtain a bandpass left cut-off wavelength λ L, a bandpass right cut-off wavelength λ R, and a wavelength λ C at a bandpass middle section of the channel Y;

a responsivity calculating module 52 adapted to calculate responsivities ResYL, ResYR and ResYC generated by the wavelengths λ L, λ R and λ C to the channel Y, respectively;

and the isolation degree test module 53 is suitable for judging the isolation degree between the light receiving device channels according to the difference between the responsivities ResYC and ResYL and/or the difference between the responsivities ResYC and ResYR.

In another embodiment of the present invention, the difference specifically refers to: the ratio between responsivity ResYL and responsivity ResYC; and/or the ratio between the responsivity ResYR and the responsivity ResYC.

In another embodiment of the invention, the apparatus further comprises a monitoring module adapted to: controlling ResYL/ResYC < 1-x% and ResYR/ResYC < 1-x%, thereby satisfying the isolation requirement between the light receiving device channels, wherein x is a set value.

In another embodiment of the invention, said wavelength λ C is in particular a central wavelength.

The device for on-line testing the isolation between the light receiving device channels of the embodiment of the invention can be used for executing the method embodiment, the principle and the technical effect are similar, and the details are not repeated here.

It should be noted that:

the algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose devices may be used with the teachings herein. The required structure for constructing such a device will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or components of the embodiments may be combined into one module or component, and furthermore, they may be divided into a plurality of sub-modules or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or modules of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or modules are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It will be appreciated by those skilled in the art that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components of the apparatus for detecting a wearing state of an electronic device according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.

For example, fig. 6 shows a schematic structural diagram of an electronic device according to an embodiment of the invention. The electronic device conventionally comprises a processor 61 and a memory 62 arranged to store computer executable instructions (program code). The memory 62 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. The memory 62 has a storage space 63 storing program code 64 for performing any of the method steps in the embodiments. For example, the storage space 63 for the program code may include respective program codes 54 for implementing the various steps in the above method, respectively. The program code can be read from or written to one or more computer program products. These computer program products comprise a program code carrier such as a hard disk, a Compact Disc (CD), a memory card or a floppy disk. Such a computer program product is typically a computer readable storage medium such as described in fig. 7. The computer readable storage medium may have memory segments, memory spaces, etc. arranged similarly to the memory 62 in the electronic device of fig. 6. The program code may be compressed, for example, in a suitable form. In general, the memory means store program code 71 for performing the steps of the method according to the invention, i.e. program code readable by a processor such as 61, which when run by an electronic device causes the electronic device to perform the steps of the method described above.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the modular claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

Claims

1. A method for testing the isolation between the channels of a light receiving device on line is characterized by comprising the following steps of:

judging the isolation degree between the light receiving device channels according to the difference between responsivities ResYC and ResYL and/or the difference between responsivities ResYC and ResYR, and controlling the difference within a set range to meet the isolation degree requirement of the light receiving device channels, wherein the difference specifically refers to: the ratio between responsivity ResYL and responsivity ResYC; and/or the ratio between the responsivity ResYR and the responsivity ResYC.

2. The method of claim 1, further comprising: controlling ResYL/ResYC < 1-x% and ResYR/ResYC < 1-x%, thereby satisfying the isolation requirement between the light receiving device channels, wherein x is a set value.

3. The method according to claim 2, wherein the wavelength λ C is in particular a center wavelength.

4. The utility model provides a device of on-line test light receiving device interchannel isolation, characterized by includes the following module of execution in proper order:

the isolation test module is suitable for judging the isolation between the light receiving device channels according to the difference between the responsivities ResYC and ResYL and/or the difference between the responsivities ResYC and ResYR, and controlling the difference within a set range to meet the isolation requirement of the light receiving device channels, wherein the difference specifically refers to: the ratio between responsivity ResYL and responsivity ResYC; and/or the ratio between the responsivity ResYR and the responsivity ResYC.

5. The apparatus of claim 4, further comprising a monitoring module adapted to: controlling ResYL/ResYC < 1-x% and ResYR/ResYC < 1-x%, thereby satisfying the isolation requirement between the light receiving device channels, wherein x is a set value.

6. The device according to claim 5, wherein the wavelength λ C is in particular a center wavelength.

7. An electronic device, wherein the electronic device comprises:

a processor; and

a memory arranged to store computer executable instructions that, when executed, cause the processor to perform a method according to any one of claims 1 to 3.

8. A computer readable storage medium, wherein the computer readable storage medium stores one or more programs which, when executed by a processor, implement the method of any of claims 1-3.