CN103873141B - Optical fiber and digital OTDR detection method and device - Google Patents

Abstract

The invention relates to an optical fiber digital OTDR detection method and device. The device is arranged on an optical network main control chip and includes a receiving module, a sending module, a configuration module and a memory module. The configuration module configures receiving control parameters for the receiving module and is a sending module Configure the sending control parameters; the receiving module receives and buffers the parallel data sent by the external optical receiving and A/D conversion modules, samples the parallel data according to the receiving control parameters, and saves the sampled data to the memory module; the sending module sends Control parameters, obtain configuration data from the configuration module to perform parallel-to-serial conversion, parity control and channel selection, and send to the external optical transmission module in a transmission sequence. The present invention can realize the OTDR function on the main control chip of the optical network in the form of a digital module, which meets the construction requirements of the optical network, saves the development time and cost of the optical fiber detection device, and improves the flexibility and accuracy of the optical fiber detection device. Spend.

Description

Optical fiber digital OTDR detection method and device

technical field

The invention relates to the technical field of optical fiber communication, in particular to an optical fiber digital OTDR detection method and device.

Background technique

At present, optical networks such as GPON and EPON have been greatly popularized, so the quality inspection of laid optical fibers has become a very important issue.

At present, many optical fiber detection methods are to add OTDR (Optical Time Domain Reflectometer, Optical Time Domain Reflectometer) equipment outside the existing equipment. The traditional OTDR is a precision optoelectronic integrated instrument made of Rayleigh scattering and Fresnel reflection when the light is transmitted in the optical fiber. It is widely used in the maintenance and construction of optical cable lines. Measure the fiber length, fiber transmission attenuation, joint attenuation and fault location. However, the existing OTDR equipment is relatively expensive, inconvenient to operate, and increases operation and maintenance costs.

Contents of the invention

The main purpose of the present invention is to provide a low-cost and easy-to-operate optical fiber digital OTDR detection method and device.

In order to achieve the above object, the present invention proposes a kind of optical fiber digital OTDR detection device, is arranged on the main control chip of optical network, comprises: receiving module, sending module, configuration module and memory module, wherein:

The configuration module is used to configure receiving control parameters for the receiving module, and configure sending control parameters for the sending module;

The receiving module is used to receive and buffer the parallel data sent by the external light receiving and A/D conversion module, sample the parallel data according to the receiving control parameters, and save the sampled data to the memory module ;

The sending module is used to obtain configuration data from the configuration module to perform parallel-serial conversion, parity control and channel selection according to the sending control parameters, and send it to an external optical sending module in a sending sequence.

Preferably, the sending module is further configured to send the sending sequence to the receiving module according to the internal return path selected by the sending control parameter.

Preferably, the configuration module is provided with a user access interface, and the configuration module is further configured to receive user input information through the user access interface for parameter configuration.

Preferably, the receiving control parameters at least include: receiving RAM depth, receiving delay point, and soft reset configuration information; the sending control parameters include at least: sending start point, sending sequence content, sending sequence length, sending sequence rate, internal and external Channel and send parity configuration information.

Preferably, the receiving module is further configured to start counting when the sending module starts sending, and open a sampling window for data sampling when the count value reaches the value configured for the receiving delay point.

Preferably, the receiving module is also used to save data to the receiving RAM of the memory module when the write RAM address is less than the value of the receiving RAM depth configuration; stop saving data when the writing RAM address is equal to the value of the receiving RAM depth configuration, and output Save the completed signal for user query.

The present invention also proposes a kind of optical fiber digital OTDR detection method, comprising:

receiving and buffering the parallel data sent by the external optical receiving and A/D conversion modules, sampling the parallel data according to the configured receiving control parameters, and saving the sampled data to the memory module;

According to the configured transmission control parameters, the configuration parameters are obtained from the configuration module to perform parallel-to-serial conversion, parity control and channel selection, and are sent to the external optical transmission module in a transmission sequence.

Preferably, the method also includes:

Sending the sending sequence to the receiving module according to the internal return path selected by the sending control parameter.

Preferably, before the step of receiving and buffering the parallel data sent by the external light receiving and A/D conversion module, it also includes:

The parameter configuration is performed by receiving user input information through the user access interface.

Preferably, the receiving control parameters at least include: receiving RAM depth, receiving delay point, and soft reset configuration information; the sending control parameters include at least: sending start point, sending sequence content, sending sequence length, sending sequence rate, internal and external Channel and send parity configuration information.

Preferably, the step of sampling the parallel data includes: starting counting when starting to send data, and opening a sampling window for data sampling when the count value reaches the value configured for the receiving delay point.

Preferably, the step of saving the sampling data to the memory module includes:

When the write RAM address is less than the value of the receiving RAM depth configuration, save the data to the receiving RAM of the memory module; when the writing RAM address is equal to the value of the receiving RAM depth configuration, stop saving the data, and output a save completion signal for the user to query.

An optical fiber digital OTDR detection method and device proposed by the present invention can realize the function of OTDR on the main control chip of the optical network in the form of a digital module, without the need of an external traditional optical fiber detection device, which is not only easy to operate, but also satisfies The construction needs of the increasingly fast-growing optical network; compared with the existing technology, it has made progress in the design of digital modules, achieved the effect of being flexible and changeable to meet customer customization, saved the time and cost of developing optical fiber detection devices, and improved The flexibility and accuracy of the optical fiber detection device.

Description of drawings

Fig. 1 is the structural representation of an embodiment of optical fiber digital OTDR detection device of the present invention;

Fig. 2 is a schematic flowchart of an embodiment of an optical fiber digital OTDR detection method of the present invention.

detailed description

The main idea of the solution in the embodiment of the present invention is: since most of the existing optical network main control chips are ASIC or FPGA chips, additional digital modules can be added according to the user, so it can be considered to add digital modules on the main control chip (that is, this The optical fiber digital OTDR detection device described in the invention) simulates the function of OTDR.

As shown in Figure 1, a kind of optical fiber digital OTDR detection device that one embodiment of the present invention proposes is arranged on the main control chip of the optical network, including: receiving module 101, sending module 104, configuration module 103 and memory module 102, wherein:

The receiving module 101 is connected to an external optical receiving and A/D conversion module 105 , and the transmitting module 104 is connected to an external optical transmitting module 106 .

The configuration module 103 is configured to configure receiving control parameters for the receiving module 101, and configure sending control parameters for the sending module 104;

The receiving module 101 is used to receive and buffer the parallel data sent by the external light receiving and A/D conversion modules, sample the parallel data according to the receiving control parameters, and save the sampled data to the internal memory module 102;

The sending module 104 is used to obtain configuration data from the configuration module 103 to perform parallel-to-serial conversion, parity control and channel selection according to the sending control parameters, and send it to the external optical sending module 106 in a sending sequence.

Specifically, the optical fiber digital OTDR detection device in this embodiment can be added on the main control chip of the optical network in the design mode of a digital module. In this embodiment, the digital module is designed with a hardware description language, which can be specifically designed in Verilog HDL language , the digital module can be flexibly divided into the above-mentioned several small modules, including a sending module 104 , a receiving module 101 , a configuration module 103 and a memory module 102 .

The specific design method and function of each small module are as follows:

The configuration module 103 provides user access interfaces and internal configuration registers, such as the CPU interface module shown in FIG. 1 , and can also be changed to other interfaces to facilitate the configuration of some parameters by the user.

The CPU interface module provides an interface for communicating with external chips, generally a CPU bus interface. Through this module, the user can configure some internal registers, as shown in Figure 1, the sending start point configuration 0, the sending sequence content 1, the sending sequence length configuration 2, the sending sequence rate configuration 3, the internal and external path configuration 4, and the receiving RAM depth Configuration 5, receiving delay point configuration 6, soft reset configuration 7 and sending parity configuration 8.

The sending module 104 includes a sending module 1040, a sending module 1041, and a sending module 1042. Each module is independently controlled by parameters in the configuration module 103, such as controlling the length, content, rate, and starting point of optical signal transmission; the available status of the sending module 1040 The parallel-to-serial conversion part can be realized by using a shift register; the sending module 1041 is realized by a 2-to-1 selector; the sending module 1042 is realized by a 2-to-1 selector, and the user can select 4 by configuring internal and external channels Use either an external hardware path or an internal loopback path.

The receiving module 101 can be divided into receiving module 1010, receiving module 1011, and receiving module 1012. Each module is also controlled by parameters in the configuration module 103, such as controlling the sampling length and sampling time point of the received optical signal.

Wherein, the receiving module 1010 is implemented with one buffer, the clock frequency values of receiving parallel data 0 and receiving parallel data 1 shown in FIG. Start counting when sending is started, and open the sampling window when the count value reaches the value of receiving delay point configuration 6, allowing the sampling data to be saved in the receiving RAM; the receiving module 1012 can be implemented using a comparator, when the write RAM address is less than the receiving When the RAM depth configuration is 5, continue to save data in RAM; when the write RAM address is equal to the receiving RAM depth configuration 5, stop saving data, and give a save completion signal write_done, when the user queries the signal through the CPU interface and sets it to 1 Time, you can read the data receiving RAM for analysis.

The memory module 102 is realized by using one or more fake dual-port RAMs, no external memory chips are needed, and its depth can be designed according to actual needs. The data width is a false dual-port RAM of 32 bits.

Through the above scheme, this embodiment has made progress in the design of digital modules, achieved the effect of being flexible and changeable to meet customer customization, saved the time and cost of developing the optical fiber detection device, and improved the flexibility and accuracy of the optical fiber detection device etc.; and this modular design method is easier to develop and maintain. In addition, the device can be designed using an FPGA logic chip, which can realize various functions of the optical fiber detection device faster.

As shown in Figure 2, the preferred embodiment of the present invention proposes a kind of optical fiber digital OTDR detection method, implements according to the device of above-mentioned embodiment, this method comprises:

Step S201, receiving and buffering the parallel data sent by the external light receiving and A/D conversion module, sampling the parallel data according to the configured receiving control parameters, and saving the sampled data to the memory module;

Step S202, according to the configured transmission control parameters, obtain configuration data from the configuration module to perform parallel-to-serial conversion, parity control and path selection, and send it to an external optical transmission module in a transmission sequence.

Among them, the receiving control parameters at least include: receiving RAM depth, receiving delay point and soft reset configuration information; the sending control parameters include at least: sending start point, sending sequence content, sending sequence length, sending sequence rate, internal and external paths and sending Parity configuration information.

Specifically, the optical fiber digital OTDR detection device adopted in the method of this embodiment can be added on the main control chip of the optical network in the design mode of a digital module, and this embodiment is designed with a hardware description language for the digital module, specifically Verilog HDL language design, the digital module can be flexibly divided into several small modules, including sending module, receiving module, configuration module and memory module.

The specific design method and function of each small module are as follows:

The configuration module provides user access interfaces and internal configuration registers. For example, the CPU interface module shown in Figure 1 can also be changed to other interfaces to facilitate the configuration of some parameters by the user.

The CPU interface module provides an interface for communicating with external chips, generally a CPU bus interface. Through this module, the user can configure some internal registers, as shown in Figure 1, the sending start point configuration 0, the sending sequence content 1, the sending sequence length configuration 2, the sending sequence rate configuration 3, the internal and external path configuration 4, and the receiving RAM depth Configuration 5, receiving delay point configuration 6, soft reset configuration 7 and sending parity configuration 8.

The sending module includes sending module 0, sending module 1, and sending module 2. Each module is independently controlled by the parameters in the configuration module, such as controlling the length, content, rate, starting point, etc. of optical signal transmission; sending module 0 can be implemented with a state machine , the parallel-to-serial conversion part can be realized by using a shift register; the sending module 1 is realized by a 2-to-1 selector; the sending module 2 is realized by a 2-to-1 selector, and the user can choose to use the external channel configuration 4 by configuring the internal and external channels. Hardware path or internal loopback path.

The receiving module can be divided into receiving module 0, receiving module 1, and receiving module 2. Each module is also controlled by parameters in the configuration module, such as controlling the sampling length and sampling time point of the received optical signal.

Among them, receiving module 0 is implemented with one buffer. The clock frequency values of receiving parallel data 0 and receiving parallel data 1 shown in Figure 1 should be the same, but the phases can be different; Start counting when sending is started, and open the sampling window when the count value reaches the value of receiving delay point configuration 6, allowing the sampling data to be saved in the receiving RAM; receiving module 2 can be implemented using a comparator, when the write RAM address is less than receiving When the RAM depth configuration is 5, continue to save data in RAM; when the write RAM address is equal to the receiving RAM depth configuration 5, stop saving data, and give a save completion signal write_done, when the user queries the signal through the CPU interface and sets it to 1 Time, you can read the data receiving RAM for analysis.

The memory module is realized by using one or more fake dual-port RAMs. It does not require external memory chips. Its depth can be designed according to actual needs. For example, if you want to save 1024×32bit data, you need to design a False dual-port RAM with a width of 32 bits.

The optical fiber digital OTDR detection method and device of the embodiment of the present invention can realize the function of OTDR on the main control chip of the optical network in the form of a digital module, without the need for an external traditional optical fiber detection device, which is not only easy to operate, but also satisfies the increasingly fast The construction needs of the developing optical network; Compared with the existing technology, it has made progress in the design of digital modules, achieved the effect of being flexible and changeable to meet customer customization, saved the time and cost of developing optical fiber detection devices, and improved the quality of optical fiber detection. The flexibility and accuracy of the device, etc.

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (10)

1. optical fiber and digital OTDR detects a device, is arranged on light net main control chip, it is characterised in that Including: receiver module, sending module, configuration module and memory modules, wherein:

Described configuration module controls parameter, for described sending module for receiving for the configuration of described receiver module Configuration sends and controls parameter；

Described receiver module is for receiving send and line number from outside light-receiving and A/D modular converter According to and cache, control parameter according to described reception, described parallel data sampled, and by hits According to preserving to described memory modules；

Described sending module, for controlling parameter according to described transmission, obtains configuration data from configuration module Carry out parallel-serial conversion, odd even controls and path selects, to send sequence transmission to outside optical transmission module；

Wherein, described receive control parameter at least include: receive the RAM degree of depth, receive postpone point and soft multiple Position configuration information；The described control parameter that sends at least includes: sends starting point, transmission sequence content, send out Send sequence length, send sequence rate, inside and outside path and send odd even configuration information.

Device the most according to claim 1, it is characterised in that described sending module is additionally operable to basis Path is returned in the inside of described transmission selection of control parameter, sends described transmission sequence to described reception mould Block.

Device the most according to claim 1, it is characterised in that described configuration module is provided with user and visits Ask that interface, described configuration module are additionally operable to receive user's input information by described user's access interface and carry out Parameter configuration.

Device the most according to claim 1, it is characterised in that described receiver module is additionally operable in institute State when sending module starts transmission and start counting up, beat when count value reaches and receives the numerical value postponing some configuration Open sampling window and carry out data sampling.

Device the most according to claim 1, it is characterised in that described receiver module is additionally operable to when writing During the numerical value that address ram configures less than the reception RAM degree of depth, preserve to the reception RAM of memory modules Data；Stop preserving data when writing address ram equal to the numerical value receiving the configuration of the RAM degree of depth, and defeated Go out the signal preserved to inquire about for user.

6. an optical fiber and digital OTDR detection method, it is characterised in that including:

Receive the parallel data sent from outside light-receiving and A/D modular converter and cache, according to joining The reception put controls parameter, samples described parallel data, and preserves sampled data to internal memory mould Block；

According to configuration transmission control parameter, from configuration module obtain configuration parameter carry out parallel-serial conversion, Odd even controls and path selects, to send sequence transmission to outside optical transmission module；

The described control parameter that receives at least includes: receive the RAM degree of depth, reception postpones point and warm reset configures Information；The described control parameter that sends at least includes: sends starting point, send sequence content, transmission sequence Length, transmission sequence rate, inside and outside path and transmission odd even configuration information.

Method the most according to claim 6, it is characterised in that also include:

Path is returned in inside according to described transmission selection of control parameter, sends described transmission sequence to connecing Receive module.

Method the most according to claim 6, it is characterised in that described reception connects from outside light Receive and also include before parallel data that A/D modular converter sends the step that caches:

Receive user's input information by user's access interface and carry out parameter configuration.

Method the most according to claim 8, it is characterised in that described parallel data is sampled Step include: start send data time start counting up, count value reach receive postpone some configuration Open sampling window during numerical value and carry out data sampling.

Method the most according to claim 8, it is characterised in that described by sampled data preserve extremely The step of memory modules includes:

When writing address ram less than the numerical value receiving the configuration of the RAM degree of depth, to the reception of memory modules RAM preserves data；Stop preserving when writing address ram equal to the numerical value receiving the configuration of the RAM degree of depth Data, and export the signal preserved for user's inquiry.