CN206620132U - The OTDR optical amplification devices of many backups of common light source - Google Patents

Abstract

The utility model provides a kind of OTDR optical amplification devices of many backups of common light source, including：Main control unit, data acquisition process unit, laser control driver element, the pump laser assembled unit of N number of pump laser composition, photoswitch control matrix, Nx1 photoswitches, optical circulators, output photoswitch, pump combiner MUX；N number of 1x2 photoswitches are provided with the photoswitch control matrix；N≥2；Laser control driver element includes mode selection switch matrix and laser control driving matrix；N number of driver element is provided with laser control driving matrix；Main control unit connection and control model selecting switch matrix；Each driver element in laser control driving matrix connects each corresponding pump laser in the laser assembled unit of Pu respectively；The utility model, which shares pumping laser light source, realizes OTDR functions built in optical amplification device, and backup light source adds OTDR reliability.

Description

The OTDR optical amplification devices of many backups of common light source

Technical field

The utility model is related to a kind of common light source used in fiber optic communication field, especially a kind of fiber optic communication field Many backups OTDR optical amplification devices.

Background technology

Optical time domain reflectometer（OTDR）English full name be Optical Time Domain Reflectometer.OTDR The precision for being backscattering produced by the Rayleigh scattering and Fresnel reflection when being transmitted in a fiber using optical signal and being made Optoelectronic integration instrument, it is widely used among the maintenance of lightguide cable link, construction, can carry out fiber lengths, optical fiber The measurement of transmission attenuation, joint decay and fault location etc..

Long-haul transmission system typically all be unable to do without erbium-doped fiber amplifier at this stage, and raman optical amplifier or both is combined Now therefore to all whom it may concern constituted together etc..Before specific Transmission system is opened, before access raman optical amplifier, General way is to detect the situation of optical fiber in advance with OTDR instrument, after confirming that joint, optical fiber attenuation are all normal value, Image intensifer could be accessed.In long range transmission field application, need to purchase during optical communication equipment networking special OTDR and Supporting test device, is tested and is monitored to the optical fiber of connection.Optical time domain reflectometer（OTDR）Pass through direct-connected optical fiber or utilization Specific wavelength light pulse insertion optical fiber is tested, and Test Networking scheme is complicated, and OTDR equipment price is high.Factors above causes The complexity height of optical-fiber network maintenance with monitoring fiber functions, cost are high.And OTDR equipment belongs to expensive equipment, built in it Laser light source is once damaged, it is necessary to change OTDR equipment so that optical-fiber network maintenance cost is further improved.

The content of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art that there is provided a kind of many backups of common light source OTDR optical amplification devices, optical amplification device work before, OTDR mode of operations can be first opened, to detect Transmission Fibers Loss situation, image intensifer mode of operation is opened after confirming Transmission Fibers in order；The utility model reduces costliness OTDR equipment, sharing pumping laser light source realizes OTDR functions built in optical amplification device, and backup light source is added OTDR reliability, but without extra spending；The technical solution adopted in the utility model is：

A kind of OTDR optical amplification devices of many backups of common light source, including：Main control unit, data acquisition process unit, Laser control driver element, the pump laser assembled unit of N number of pump laser composition, photoswitch control matrix, Nx1 light Switch, optical circulators, output photoswitch, pump combiner MUX；Opened in the photoswitch control matrix provided with N number of 1x2 light Close；N≥2；

Laser control driver element includes mode selection switch matrix and laser control driving matrix；Laser control N number of driver element is provided with system driving matrix；Main control unit connection and control model selecting switch matrix；Mode selection switch square N number of output end of battle array connects N number of driver element in control laser control driving matrix respectively；Laser control drives matrix In each driver element connect each corresponding pump laser in the laser assembled unit of Pu respectively；

1x2 photoswitches in photoswitch control matrix include an input and two selection output ends；Photoswitch is controlled Matrix connects and is controlled by main control unit, is connected for switching one of the inputs of 1x2 photoswitches and two selection output ends；Respectively The connection corresponding with each pump laser output end in pump laser assembled unit respectively of the input of individual 1x2 photoswitches；Respectively One of individual 1x2 photoswitches selection output end is connected with each input of Nx1 photoswitches respectively, each 1x2 photoswitch it is another Individual selection output end is connected with pump combiner MUX each input respectively；The input of 1x2 photoswitches and a selection are exported During the connection of end, the 1x2 photoswitches switch to OTDR operation ranges；The input of 1x2 photoswitches connects with another selection output end When connecing, the 1x2 photoswitches switch to image intensifer operation range；

Nx1 photoswitches connect and are controlled by main control unit；Nx1 photoswitches include N number of input and an output end；

Optical circulators include tri- ports of 1a, 2a, 3a；

Output photoswitch connects and is controlled by main control unit, and output photoswitch includes 1b, 2b input port and 3b output ends Mouthful；

The output end of Nx1 photoswitches connects the 1a ports of optical circulators, the 2a ports connection output light of optical circulators The 1b input ports of switch；The 3a ports of optical circulators connect the input of data acquisition process unit；Data acquisition process The output end connection main control unit of unit；

Pump combiner MUX output end connects the 2b input ports for exporting photoswitch by isolator；Or with every Output end from the pump combiner of ability is directly connected to export the 2b input ports of photoswitch；

Export the 3b output ports connection Transmission Fibers of photoswitch.

Further,

Main control unit includes MCU and the FPGA controller being connected with each other；FPGA controller connects data by controlling bus Collecting unit；The output end of data acquisition process unit connects FPGA controller by data/address bus；MCU is connected and controlled respectively N roads 1x2 photoswitches, output photoswitch and Nx1 photoswitches in photoswitch control matrix；MCU is also connected with and controls laser control Driver element processed；FPGA controller connects and controls laser control driver element；

The OTDR optical amplification devices of many backups of the common light source include two kinds of mode of operations；OTDR mode of operations and light are put Big device mode of operation；

When mode of operation is OTDR mode of operations, with being used as OTDR light sources in MCU selection laser control driving matrixes Pump laser corresponding to driver element work, and close the driver element of other pump lasers；Simultaneously according to user Selected or system default, is selected as the pump laser of OTDR light sources, and the corresponding 1x2 photoswitches of selected pump laser are cut Shift to OTDR operation ranges；Gate the corresponding passage of the selected pump laser of this in Nx1 photoswitches, the 1b of control output photoswitch Input port is connected with 3b output ports；Meanwhile, the corresponding mould of the selected pump laser of this in switch mode selecting switch matrix Formula selecting switch, OTDR impulse ejection modes are switched to by the type of drive of the selected pump laser；Thereafter, according to being surveyed The length of Transmission Fibers link, light pulse amplitude, pulsewidth and sampling number needed for setting, by data/address bus by institute's setting parameter It is transmitted to FPGA controller and starts FPGA controller, FPGA controller controls the driver element of the selected pump laser so that Pump laser output optical pulse signal；The light pulse signal passes sequentially through corresponding 1x2 photoswitches, Nx1 in optical switch matrix Photoswitch, optical circulators 1a->2a ports, output photoswitch, into Transmission Fibers；Various terminal loss in Transmission Fibers Or the next Rayleigh scattering of optical fiber lesion ribbon or Fresnel reflection are by exporting photoswitch and optical circulator 2a->3a is returned port Return in digital sampling and processing；Digital sampling and processing receives the scattering/reflected light signal, converts optical signals to electricity FPGA controller is delivered to after signal and carries out data sampling；FPGA controller sends the data of reading to MCU, and MCU receives number According to rear carry out data processing, to obtain the testing result of Transmission Fibers link；

When mode of operation is image intensifer mode of operation, N number of 1x2 photoswitches are switched to image intensifer work shelves by MCU Position, the 2b input ports of control output photoswitch are connected with 3b output ports；Meanwhile, the mould in switch mode selecting switch matrix All pump laser type of drive are switched to image intensifer laser type of drive by formula selecting switch；Thereafter, MCU is examined Look into when meeting turn on pump condition, control each pump laser to open and arrive default pump power.

Further,

Data acquisition process unit includes the opto-electric transceiver module, high gain signal amplification module, isolation being sequentially connected And filter circuit, A/D converter circuit, data storage cell；Wherein high gain signal amplification module, A/D converter circuit, data storage Unit is controlled by main control unit；

Opto-electric transceiver module receives the scattering/reflected light signal in digital sampling and processing, converts optical signals to Amplify after electric signal through plus and blowup circuit module, the electric signal needed for being converted to A/D converter circuit in scope；

At the same time, FPGA controller control A/D converter circuit starts sampling, and the electric signal sampled is converted into numeral Send data storage cell after signal to, treat after the completion of a fibre circuit scanning, FPGA segmentations are read in data storage cell Data, and MCU to is sent the data of reading by data/address bus, MCU is received and data processing is carried out after data, and according to Set sampling number, FPGA controller constantly performs said process, treats after the completion of all sampling processes, MCU analyses are acquired Total data to obtain the testing result of Transmission Fibers link.

Further,

During OTDR mode of operations, if selected occur as the pump laser i of OTDR light sources or its correspondence driver element Failure, main control unit automatically in a predetermined sequence automatic switchover pump laser and correspondence driver element.

Further,

If currently selected break down as the pump laser i of OTDR light sources or its correspondence driver element, cut automatically Order when changing is according to i+1 to N, 1 to i-1.

Further,

The turn on pump condition met is needed during image intensifer mode of operation：Transmission Fibers state is being determined just according to testing result Often, and OTDR optical amplification device temperature, each pump laser die temperature, these factor of judgment of scattering/reflected light signal power All do not alert, input optical signal is more than threshold value, and OTDR optical amplification devices are in amplifier enabled state.

Further,

In optical circulators, light can only follow 1a->2a->3a directions one-way transmission.

Further,

Optical circulators are replaced with fiber coupler.

The utility model has the advantage of：It is simultaneously common as OTDR light sources that the utility model chooses some pump laser With, the OTDR of costliness equipment cost is not only saved, and can be with the loss of on-line real time monitoring fibre circuit, triggering in time Alarm.In addition, OTDR common light sources are still backed up more, after current OTDR light sources break down, and main control unit can root Corresponding backup light source is set to be OTDR light sources according to feedback information, OTDR detections business will not be interrupted.

Brief description of the drawings

Fig. 1 is structure composition schematic diagram of the present utility model.

Fig. 2 is laser control structure of driving unit schematic diagram of the present utility model.

Fig. 3 is the 1x2 photoswitch schematic diagrames in photoswitch of the present utility model control matrix.

Fig. 4 is main control unit structural representation of the present utility model.

Fig. 5 is data acquisition process cellular construction schematic diagram of the present utility model.

Fig. 6 is the flow chart of the utility model control method.

Embodiment

With reference to specific drawings and examples, the utility model is described in further detail.

The utility model proposes a kind of OTDR optical amplification devices of many backups of common light source, as shown in figure 1, including：It is main Control the pump laser combination that unit, data acquisition process unit, laser control driver element, N number of pump laser are constituted Unit, photoswitch control matrix, Nx1 photoswitches, optical circulators, output photoswitch, pump combiner MUX；The photoswitch Control to be provided with N number of 1x2 photoswitches in matrix；N≥2；

As shown in Fig. 2 laser control driver element includes mode selection switch matrix and laser control driving square Battle array；N number of driver element is provided with laser control driving matrix；Main control unit connection and control model selecting switch matrix；Mould N number of output end of formula selecting switch matrix connects N number of driver element in control laser control driving matrix respectively；Laser Each driver element in control driving matrix connects each corresponding pump laser in the laser assembled unit of Pu respectively；

Pump laser can use Raman pump laser, and its type is generally semiconductor pump laser, exports laser Using polarization-maintaining mode.Pumping wavelength is generally 14xxnm.If second order raman amplifier, pumping wavelength can also be 13xxnm.Pump laser can also select EDFA pump lasers；Raman pump laser and EDFA pump lasers all belong to In semiconductor pump laser；The utility model may make up the raman optical amplifier with OTDR functions or EDFA image intensifers etc.；

Some pump laser in pump laser assembled unit is as common light source, both as OTDR light sources, As image intensifer light source；Common light source is any one pump laser in pump laser assembled unit, not spy Finger property, it can be any one in 1~N of pump laser in pump laser assembled unit；When practical operation, this A little pump lasers are to take similar implementation in parallel, and user can specify a certain pump laser swashing as OTDR light sources Light device, it would however also be possible to employ the option of system default；So when some is occurred by the pump laser that OTDR light sources are done in the first choosing After failure, system automatically switches the laser of next pump laser as OTDR light sources, and reports pump laser different automatically Normal information, so, built-in OTDR functions are unaffected；As the pump laser of common light source be all on OTDR light sources all It is mutually redundant relation.

Photoswitch (Optical Switch, OS) is that one kind has one or more selectable transmission windows, can be to light Optical signal in transmission line or integrated optical circuit carries out the device of mutually conversion or logical operation.Its most basic form has 1 × 2 Road, 2 × 2 road photoswitches etc..

As shown in figure 3, the 1x2 photoswitches in photoswitch control matrix include an input and two selection output ends； Photoswitch control matrix connects and is controlled by main control unit, input and two selection output ends for switching 1x2 photoswitches One of connection；The input of each 1x2 photoswitch respectively with each pump laser output end in pump laser assembled unit Correspondence connection；One selection output end of each 1x2 photoswitch is connected with each input of Nx1 photoswitches respectively, each 1x2 light Another selection output end of switch is connected with pump combiner MUX each input respectively；

When the input of 1x2 photoswitches is connected with a selection output end 1, the 1x2 photoswitches switch to OTDR work shelves Position；When the input of 1x2 photoswitches is connected with another selection output end 2, the 1x2 photoswitches switch to image intensifer work shelves Position；

Nx1 photoswitches connect and are controlled by main control unit；Nx1 photoswitches include N number of input and an output end；N×1 Photoswitch is used to realize the function of backing up OTDR light sources more；By main control unit according to Transmission system demand determine pump laser and The respective path gating of the photoswitch of N × 1 as OTDR light sources pump laser；

Optical circulators include tri- ports of 1a, 2a, 3a；In optical circulators, light can only follow 1a->2a->3a directions One-way transmission；In actual applications, optical circulators can also be replaced with fiber coupler；

Output photoswitch connects and is controlled by main control unit, and output photoswitch includes 1b, 2b input port and 3b output ends Mouthful；Output photoswitch is used to switch OTDR mode of operations and image intensifer mode of operation；

The output end of Nx1 photoswitches connects the 1a ports of optical circulators, the 2a ports connection output light of optical circulators The 1b input ports of switch；The 3a ports of optical circulators connect the input of data acquisition process unit；Data acquisition process The output end connection main control unit of unit；

The Laser synthesizing that pump combiner MUX is used to export the pump laser of different wave length is a branch of；Pump combiner MUX is generally film filter type, now needs to connect an isolator behind；Pump combiner MUX output end is led to Cross the 2b input ports of isolator connection output photoswitch；Pump combiner MUX can also be isolation polarized pump bundling device, use In the laser power of synthesis phase co-wavelength, while having the ability of isolation reflected signal, prevent reflected signal from feeding back to laser The output stability of pump laser is influenceed in resonator, extra isolator now need not be just set；

Export 3b output ports connection Transmission Fibers/gain media of photoswitch；

As shown in figure 4, main control unit includes MCU and the FPGA controller being connected with each other；Between MCU and FPGA controller Connection line includes address bus and data/address bus；FPGA controller connects data acquisition unit by controlling bus；Data are adopted The output end of collection processing unit connects FPGA controller by data/address bus；Wherein MCU can select arm processor or other micro- Processor；MCU is connected and is controlled photoswitch to control the N roads 1x2 photoswitches in matrix, output photoswitch and Nx1 photoswitches respectively； MCU is also connected with and controls laser control driver element；FPGA controller connects and controls laser control driver element；

As shown in figure 5, data acquisition process unit includes opto-electric transceiver module, the high gain signal amplification being sequentially connected Module, isolation and filter circuit, A/D converter circuit, data storage cell；Wherein high gain signal amplification module, AD conversion are electric Road, data storage cell are controlled by main control unit；Opto-electric transceiver module by high-responsivity photodetector APD and its bias Circuit is constituted, and APD exports the current signal that the optical signal received is converted to respective intensities；High gain signal amplification module will The current signal received is converted to voltage signal and amplified accordingly；Filtering and isolation circuit believe the voltage after amplification Number it is filtered and isolates high gain signal amplification module and A/D converter circuit；A/D converter circuit is under the control of main control unit The voltage signal received is converted to and sends data storage cell after data signal to；The corresponding number of data storage cell storage Word signal is simultaneously supplied to main control unit to use；

The OTDR optical amplification devices of many backups of the common light source include two kinds of mode of operations：OTDR mode of operations and light are put Big device mode of operation；As shown in Figure 6；

When mode of operation is OTDR mode of operations, with being used as OTDR light sources in MCU selection laser control driving matrixes Pump laser corresponding to driver element work, and close the driver element of other pump lasers；Simultaneously according to user Selected or system default, is selected as the pump laser of OTDR light sources, and the corresponding 1x2 photoswitches of selected pump laser are cut Shift to OTDR operation ranges；Gate the corresponding passage of the selected pump laser of this in Nx1 photoswitches, the 1b of control output photoswitch Input port is connected with 3b output ports；

Meanwhile, the corresponding mode selection switch of the selected pump laser of this in switch mode selecting switch matrix, by the pump The type of drive of Pu laser switches to OTDR impulse ejection modes；Thereafter, according to the length of surveyed Transmission Fibers link, if Required light pulse amplitude, pulsewidth and sampling number is put, institute's setting parameter is transmitted to by FPGA controller by data/address bus and started FPGA controller, FPGA controller controls the driver element of the selected pump laser so that pump laser output optical pulse Signal；The light pulse signal passes sequentially through corresponding 1x2 photoswitches, Nx1 photoswitches, optical circulators 1a- in optical switch matrix> 2a ports, output photoswitch, into Transmission Fibers/gain media；Various terminal loss or optical fiber damage in Transmission Fibers The Rayleigh scattering or Fresnel reflection brought are by exporting photoswitch and optical circulator 2a->3a ports return to data acquisition In processing module；Opto-electric transceiver module receives the scattering/reflected light signal in digital sampling and processing, and optical signal is changed To amplify after electric signal through plus and blowup circuit module, the electric signal needed for being converted to A/D converter circuit in scope；

At the same time, FPGA controller control A/D converter circuit starts sampling, and the electric signal sampled is converted into numeral Send data storage cell after signal to, treat after the completion of a fibre circuit scanning, FPGA segmentations are read in data storage cell Data, and MCU to is sent the data of reading by data/address bus, MCU is received and data processing is carried out after data, and according to Set sampling number, FPGA controller constantly performs said process, treats after the completion of all sampling processes, MCU analyses are acquired Total data and report Transmission Fibers link load and various events etc.；

If the pump laser for being elected to be OTDR light sources breaks down, the now input of data acquisition process unit is OTDR Test side cannot get any scattering/reflected light signal, it is assumed that be now i as the pump laser numbering of OTDR light sources, then It is considered that the pump laser or its driver element there is a problem, system is automatically according to i+1 to N, and 1 to i-1 order is certainly Dynamic switching pump laser and correspondence driver element are simultaneously tested, meanwhile, report the pump laser gone wrong to compile automatically Number and the reason for problem may be caused.

After MCU obtains correct Transmission Fibers loss and attenuation data, it is possible to judge whether to meet turn on pump condition； It is normal firstly the need of confirmation Transmission Fibers state；The factor determined whether also has OTDR optical amplification device temperature, and each pumping swashs Light device die temperature, scattering/reflected light signal power, input optical signal is more than threshold value, and whether OTDR optical amplification devices, which are in, puts Big device is enabled（Enable）State etc.；If these factor of judgment are not all alerted, then image intensifer Working mould can be started Formula；

When mode of operation is image intensifer mode of operation, N number of 1x2 photoswitches are switched to image intensifer work shelves by MCU Position, the 2b input ports of control output photoswitch are connected with 3b output ports；Meanwhile, the mould in switch mode selecting switch matrix All pump laser type of drive are switched to image intensifer laser type of drive by formula selecting switch；Thereafter, MCU is examined Look into when meeting turn on pump condition, control each pump laser to open and arrive default pump power；If being unsatisfactory for turn on pump condition, report Warning information；If Transmission Fibers detection is abnormal, MCU reports optical fiber link abnormal information；

When gain control in discovery system or abnormal power output, pump laser has now been possible to Pump operation is closed in triggering.In order to detailed the reason for knowing failure, now and optical fiber need not be cut off, and only need to main control unit Control optical switch, mode selector switch are switched to OTDR puls transmission modes and had judged fiber failure situation both as described above Can.Above procedure is all remote equipment room manipulation.OTDR instruments are held to scene progress cut-out optical fiber without the person of sending someone, and are connect Enter OTDR instruments.

Claims (3)

1. a kind of OTDR optical amplification devices of many backups of common light source, it is characterised in that including：Main control unit, data acquisition Processing unit, laser control driver element, the pump laser assembled unit of N number of pump laser composition, photoswitch control Matrix, Nx1 photoswitches, optical circulators, output photoswitch, pump combiner MUX；N is provided with the photoswitch control matrix Individual 1x2 photoswitches；N≥2；

Laser control driver element includes mode selection switch matrix and laser control driving matrix；Laser control drives N number of driver element is provided with dynamic matrix；Main control unit connection and control model selecting switch matrix；Mode selection switch matrix N number of output end connects N number of driver element in control laser control driving matrix respectively；In laser control driving matrix Each driver element connects each corresponding pump laser in the laser assembled unit of Pu respectively；

1x2 photoswitches in photoswitch control matrix include an input and two selection output ends；Photoswitch controls matrix Connect and be controlled by main control unit, be connected for switching one of the inputs of 1x2 photoswitches and two selection output ends；Each The connection corresponding with each pump laser output end in pump laser assembled unit respectively of the input of 1x2 photoswitches；Each One of 1x2 photoswitches selection output end is connected with each input of Nx1 photoswitches respectively, each 1x2 photoswitch another Selection output end is connected with pump combiner MUX each input respectively；The input of 1x2 photoswitches and a selection output end During connection, the 1x2 photoswitches switch to OTDR operation ranges；The input of 1x2 photoswitches is connected with another selection output end When, the 1x2 photoswitches switch to image intensifer operation range；

Nx1 photoswitches connect and are controlled by main control unit；Nx1 photoswitches include N number of input and an output end；

Optical circulators include tri- ports of 1a, 2a, 3a；

Output photoswitch connects and is controlled by main control unit, and output photoswitch includes 1b, 2b input port and 3b output ports；

The output end of Nx1 photoswitches connects the 1a ports of optical circulators, the 2a ports connection output photoswitch of optical circulators 1b input ports；The 3a ports of optical circulators connect the input of data acquisition process unit；Data acquisition process unit Output end connection main control unit；

Pump combiner MUX output end connects the 2b input ports for exporting photoswitch by isolator；Or with isolation energy The output end of the pump combiner of power is directly connected to export the 2b input ports of photoswitch；

Export the 3b output ports connection Transmission Fibers of photoswitch.

2. the OTDR optical amplification devices of many backups of common light source as claimed in claim 1, it is characterised in that

In optical circulators, light can only follow 1a->2a->3a directions one-way transmission.

3. the OTDR optical amplification devices of many backups of common light source as claimed in claim 1, it is characterised in that

Optical circulators are replaced with fiber coupler.