CN104601223B - Optical signal-to-noise ratio (OSNR) monitoring device and method for WDM (wavelength division multiplexing) system - Google Patents
Optical signal-to-noise ratio (OSNR) monitoring device and method for WDM (wavelength division multiplexing) system Download PDFInfo
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- CN104601223B CN104601223B CN201510018272.9A CN201510018272A CN104601223B CN 104601223 B CN104601223 B CN 104601223B CN 201510018272 A CN201510018272 A CN 201510018272A CN 104601223 B CN104601223 B CN 104601223B
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Abstract
The invention relates to the field of communication, discloses optical signal-to-noise ratio (OSNR) monitoring device and method for a WDM (wavelength division multiplexing) system, and aims at solving the technical problem of relatively high requirement on detecting devices during OSNR detecting in the prior art. The device comprises optical fibers, a first fiber bragg grating, a second fiber bragg grating, a thermal printer head, a thermal printer head driver, a processing device, a photoelectric converter and a three-port optical circulator; the processing device generates a first control instruction to control the thermal printer head to heat the first position of the first fiber bragg grating, then the photoelectric converter acquires to obtain an optical signal of a filter transmission band at the first position and converts the optical signal into a first electric signal to be transmitted to the processing device; the processing device determines the first OSNR of the WDM system according to the first electric signal. With the adoption of the device and method, the technical effect of reducing the requirement for the detecting device during OSNR measuring can be achieved.
Description
Technical field
The present invention relates to a kind of optical signal-to-noise ratio monitoring device in the communications field, more particularly to wave division multiplexing WDM system and
Method.
Background technology
With WDM (Wavelength Division Multiplexing：Wavelength-division multiplex) system implementation, as its pass
One of key measurement index, OSNR (OSNRs：Optical Signal Noise Ratio) can be with direct reaction optical signal
Quality, is that assessment channel quality is good and bad, a key parameter of system service behaviour and signal transmission quality quality.Its definition is
The signal power of passage is divided by the noise power in 0.1nm at wavelength.
The method of the outer detection OSNR of traditional band is by the outer ASE noises of band, and with the ratio of inband signaling obtaining
OSNR.As wavelength-division multiplex system wavelength interval is constantly lifted, wavelength speed is constantly lifted, the continuous upgrading of modulation format, light
Being on the increase for optical filter in communication link system, causes the outer OSNR measuring methods of traditional band to become no longer accurate.Cause
This, becomes more and more crucial to the technology of OSNR monitorings in band.
The existing general measuring method to OSNR in band is typically using based on DSP (Digital Signal Processing：digital
Signal processing) mode, for transmitting and reception system have higher requirement, such as transmitting terminal using complexity
Training sequence, in the method for receiving terminal coherent demodulation, need DA conversion (digital-to-analogue conversion) chips and AD (moulds using high speed
Number conversion) sampling A/D chip, real-time OSNR monitorings to be such as realized, needs the processor of high speed to support；Or using polarization extinction
By signal polarization, the unpolarized characteristic of noise, OSNR detection techniques, realize that signal is separated with noise, this method needs complexity
Instrument and controller, such as high speed Polarization Controller, high speed polarization analyses instrument, spectrum analyzer etc. and to be difficult to use in polarization multiple
With in system.
The content of the invention
The present invention provides the optical signal-to-noise ratio monitoring device and method in a kind of wave division multiplexing WDM system, to solve existing skill
In art when OSNR is measured, the higher technical problem of the requirement to testing equipment.
In a first aspect, the embodiment of the present invention provides the optical signal-to-noise ratio monitoring device in a kind of wave division multiplexing WDM system, bag
Include：
Optical fiber；
First fiber grating, inscribes in the optical fiber；
Second fiber grating, inscribes in the optical fiber；
Thermal printer head, for heating to first fiber grating；
Thermal printer head driver, is connected to the thermal printer head, for being carried out to the thermal printer head by control instruction
Control；
Processing equipment, is connected to the thermal printer head driver, for producing the control to the thermal printer head driver
System instruction；
Optical-electrical converter；
Three ports light rings, the Single port of three ports light rings are connected to first fiber grating, described
The Two-port netwerk of three ports light rings is connected to second fiber grating, and three ports of three port photocirculator are connected to
The optical-electrical converter；
Wherein, the first control instruction for producing in the processing equipment controls the thermal printer head to the first optical fiber light
After the first position heating of grid, the light letter of the filter pass band for obtaining the first position is gathered by the optical-electrical converter
Number, and the optical signal is converted to into the first electric signal transmission to the processing equipment；The processing equipment is according to described first
The signal of telecommunication determines the first OSNR value of the wdm system.
Optionally, described device also includes：
Heat sink, heat sink, described first fiber grating and the thermal printer head are affixed.
Optionally, the processing equipment, specifically for：Determine the matched curve corresponding to the first position, the plan
Close the corresponding relation comprising the signal of telecommunication with OSNR in curve；And search in the matched curve according to first signal of telecommunication
Obtain the first OSNR value.
Optionally, the processing equipment, is additionally operable to：
Control the thermal printer head to heat the first position；Adjust at the filter pass band of the first position
The size of OSNR, and then detect acquisition and the corresponding multiple signals of telecommunication of multiple different OSNRs；Based on the plurality of
The corresponding relation of different OSNRs and the plurality of signal of telecommunication generates the matched curve.
Optionally, the processing equipment, is additionally operable to：First fiber grating is carried out by controlling the thermal printer head
Heating, and then phase shift is inserted in the transmission spectrum stopband of first fiber grating, so that occurring in the transmission spectrum stopband
Tunable optical filter.
Optionally, the processing equipment, specifically for：
The wavelength of optical filter is controlled by the position of the hot spot of the control thermal printer head；And/or
The width of optical filter is controlled by the length of the heating region of the control thermal printer head；And/or
The transmitance of the optical filter is controlled by the temperature of the heating region of the control thermal printer head.
Optionally, the bandwidth of first fiber grating is identical with the bandwidth of second fiber grating.
Second aspect, the embodiment of the present invention provide a kind of OSNR Monitoring Method, are applied in wave division multiplexing WDM system
Optical signal-to-noise ratio monitoring device in, described device includes：Optical fiber；First fiber grating, inscribes in the optical fiber；Second optical fiber light
Grid, inscribe in the optical fiber；Thermal printer head, for heating to first fiber grating；Optical-electrical converter；Three port opticals
Circulator, the Single port of three ports light rings are connected to first fiber grating, three ports light rings
Two-port netwerk is connected to second fiber grating, and three ports of three port photocirculator are connected to the optical-electrical converter,
Methods described also includes：
Control the thermal printer head to heat the first position of first fiber grating；
First signal of telecommunication that the optical-electrical converter is obtained is received, first signal of telecommunication is specially：The opto-electronic conversion
Device collection obtains the optical signal of the filter pass band of the first position, and the optical signal is carried out what opto-electronic conversion was obtained then
The signal of telecommunication；
First OSNR value of the wdm system is determined according to first signal of telecommunication.
Optionally, the first OSNR value that the wdm system is determined according to first signal of telecommunication is concrete to wrap
Include：
The matched curve of the first position is obtained, comprising signal of telecommunication pass corresponding with OSNR in the matched curve
System；
Search in the matched curve according to first signal of telecommunication and obtain the first OSNR value.
Optionally, before the matched curve obtained corresponding to the first position, methods described also includes：
Control the thermal printer head to heat the first position；
The size of the OSNR at the filter pass band of the first position is adjusted, and then detects that acquisition is different from multiple
The corresponding multiple signals of telecommunication of OSNR；
Corresponding relation based on the plurality of different OSNR and the plurality of signal of telecommunication generates the matched curve.
The present invention has the beneficial effect that：
Due in embodiments of the present invention, there is provided the optical signal-to-noise ratio monitoring device in a kind of wave division multiplexing WDM system, bag
Include：Optical fiber；First fiber grating, inscribes in optical fiber；Second fiber grating, inscribes in optical fiber；Thermal printer head, for the first light
Fine grating is heated；Thermal printer head driver, is connected to thermal printer head, for being controlled to thermal printer head by control instruction
System；Processing equipment, is connected to thermal printer head driver, for producing control instruction to thermal printer head driver；Optical-electrical converter；
Three ports light rings, the Single port of three ports light rings are connected to the first fiber grating, two ends of three ports light rings
Mouth is connected to the second fiber grating, and three ports of three port photocirculators are connected to optical-electrical converter；Wherein, produce in processing equipment
After raw the first control instruction control thermal printer head is to the first position heating of the first fiber grating, adopted by optical-electrical converter
Collection obtains the optical signal of the filter pass band of first position, and converts optical signals to the first electric signal transmission to processing equipment；Place
Reason equipment determines the first OSNR value of wdm system according to first signal of telecommunication.As can be seen here, the is obtained according to optical-electrical converter
One signal of telecommunication, it is possible to determine the first OSNR value of wdm system, the device has simple structure, dispersion, polarization insensitive
Advantage, so as to reached measure OSNR when, reduce the technique effect of the requirement to testing equipment.
Description of the drawings
Fig. 1 is the structure chart of optical signal-to-noise ratio monitoring device in the embodiment of the present invention；
Fig. 2 is the position of heat sink, the first fiber grating and thermal printer head in embodiment of the present invention optical signal-to-noise ratio monitoring device
Put relation schematic diagram；
Fig. 3 is the flow chart of OSNR Monitoring Method in the embodiment of the present invention.
Specific embodiment
The present invention provides the optical signal-to-noise ratio monitoring device and method in a kind of wave division multiplexing WDM system, to solve existing skill
In art when OSNR is measured, the higher technical problem of the requirement to testing equipment.
Technical scheme in the embodiment of the present application is to solve above-mentioned technical problem, and general thought is as follows：
There is provided the optical signal-to-noise ratio monitoring device in a kind of wave division multiplexing WDM system, including：Optical fiber；First fiber grating,
Inscribe in optical fiber；Second fiber grating, inscribes in optical fiber；Thermal printer head, for heating to the first fiber grating；Hot print
Head driver, is connected to thermal printer head, for being controlled to thermal printer head by control instruction；Processing equipment, is connected to heat
Print head driver, for producing control instruction to thermal printer head driver；Optical-electrical converter；Three ports light rings, three ends
The Single port of mouth optical circulator is connected to the first fiber grating, and the Two-port netwerk of three ports light rings is connected to the second optical fiber light
Grid, three ports of three port photocirculators are connected to optical-electrical converter；Wherein, the first control instruction control for producing in processing equipment
After printhead is heated to the first position heating of the first fiber grating, the filter for obtaining first position is gathered by optical-electrical converter
The optical signal of ripple passband, and the first electric signal transmission is converted optical signals to processing equipment；Processing equipment is according to the first telecommunications
Number determine wdm system the first OSNR value.As can be seen here, first signal of telecommunication is obtained according to optical-electrical converter, it is possible to really
Determine the first OSNR value of wdm system, the device has the advantages that simple structure, dispersion, polarization insensitive, so as to reach
When OSNR is measured, the technique effect of the requirement to testing equipment is reduced.
In order to be better understood from above-mentioned technical proposal, below by accompanying drawing and specific embodiment to technical solution of the present invention
It is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention
Thin explanation, rather than the restriction to technical solution of the present invention, in the case where not conflicting, the embodiment of the present invention and enforcement
Technical characteristic in example can be mutually combined.
In a first aspect, the embodiment of the present invention provides the optical signal-to-noise ratio monitoring device in a kind of wave division multiplexing WDM system, should
Wdm system is, for example,：DWDM (intensive OWDMs at a high speed：Dense Wavelength Division
Multiplexing) system, refer to Fig. 1, and the monitoring device includes：
Optical fiber 1；
First fiber grating 2, inscribes in optical fiber 1, and the first fiber grating 2 is, for example,：Linear chrip bragg grating,
Common bragg grating, phase shift bragg grating etc.；And as the presently preferred embodiments, the first fiber grating 2 is line
Property chirped fiber Bragg gratings, in this case, the tuning bandwidth of the wdm system is wider；
Second fiber grating 8, inscribes in optical fiber 1, and the second fiber grating 8 is, for example,：Linear chrip bragg grating,
Common bragg grating, phase shift bragg grating etc.；And as the presently preferred embodiments, the second fiber grating 8 is line
Property chirped fiber Bragg gratings, in this case, the tuning bandwidth of the wdm system is wider；
Thermal printer head 3, for heating to the first fiber grating 2；
Thermal printer head driver 5, is connected to thermal printer head 3, for being controlled to thermal printer head 3 by control instruction；
Processing equipment 6, is connected to thermal printer head driver 5, for producing control instruction, place to thermal printer head driver 5
Reason device 6 for example can be connected to thermal printer head driver 5 by data cable；
The frequency response range of optical-electrical converter 9, wherein optical-electrical converter 9 covers the first fiber grating 2 and the second optical fiber
The reflected waveband of grating 8 such that it is able to complete to convert optical signals to the function of the signal of telecommunication；
Three ports light rings 7, the Single port of three ports light rings 7 are connected to the first fiber grating 2, the three port rings of light
The Two-port netwerk of shape device 7 is connected to the second fiber grating 8, and three ports of three port photocirculators are connected to optical-electrical converter 9；
Wherein, first of the first control instruction control 3 pairs of the first fiber gratings 2 of thermal printer head for producing in processing equipment
After putting heating, the optical signal of the filter pass band for obtaining first position is gathered by optical-electrical converter 9, and is converted optical signals to
First electric signal transmission is to processing equipment；Processing equipment determines the first OSNR value of wdm system according to first signal of telecommunication.
In specific implementation process, thermal printer head 3 is rearranged by multiple hot spots.
Wherein, multiple hot spot close-packed arrays, each hot spot are corresponding with certain position of the first fiber grating 2, are used for
The position is heated.
In specific implementation process, before being monitored to the OSNR in wdm system by the monitoring device, need first
The OSNR of wdm system is demarcated, its calibration process is mainly by processing equipment to perform, and processing equipment is additionally operable to：
Control thermal printer head 3 is heated to first position；OSNR at the filter pass band of adjustment first position
Size, and then detect acquisition and the corresponding multiple signals of telecommunication of multiple different OSNRs；Based on multiple different OSNRs
Matched curve is generated with the corresponding relation of multiple signals of telecommunication.
For example, with first position as 1550.116nm, the first fiber grating 2 be the first linear Chirp Bragg optical fiber
As a example by grating, the second fiber grating 8 are the second linear chrip bragg grating, it is the er-doped light of the receiving terminal of wdm system
After fiber amplifier (erbium-doped fiber amplifier is in constant power output pattern), then control can be produced by processing equipment first
Instruction is sent to thermal printer head driver 5；Thermal printer head driver 5 after control instruction is received, by control instruction pair
Thermal printer head 3 is controlled, so as to the hot spot of correspondence 1550.116nm positions on thermal printer head 3 begins to warm up, in the first light
Diffraction characteristic at the 1550.116nm of fine grating 2 is destroyed, and (filter pass band is, for example, filter pass band occurs：Ultra-narrow band is filtered
Ripple passband)；Then the correspondence signal of telecommunication is obtained by optical-electrical converter 9；
By the size for adjusting signal or noise in fiber transmission link system, wdm system can be repeatedly adjusted
OSNR values at 1550.116nm filter pass bands, then can demarcate the size of OSNR, it is possible to by photoelectricity by spectrogrph
Transducer 9 is gathered when obtaining difference OSNR sizes, after filtering the size of the optical signal of passband, and is converted into telecommunications
Number, then export to processing equipment；
Processing equipment 6 it is determined that multiple different OSNR and from the corresponding multiple signals of telecommunication of multiple different OSNR it
Afterwards, it is possible to be depicted as matched curve.
For other positions matched curve (for example：1556nm, 1558nm), which is drawn at mode and 1550.116nm
Matched curve is similar to, and then can be based on the program, transmits in wired link, corresponding WDM channels point for specific optical fiber 1
Situation with situation and each Channel Modulation form, obtains the matched curve of each channel of system.It is then stored in processing equipment
Or other storage devices being connected with processing equipment.
And then in specific implementation process, processing equipment 6, specifically for：Determine the matched curve corresponding to first position,
Corresponding relation comprising the signal of telecommunication with OSNR in matched curve；And the is obtained according to searching in the first signal of telecommunication matched curve
One OSNR value.
For example, when using the monitoring device, due to processing equipment 6 send to thermal printer head driver 5 first
Control instruction, so processing equipment 6 can directly determine first position, it is assumed that be：1550.116nm, then processing equipment 6 is from depositing
The matched curve corresponding to 1550.116nm is determined in multiple matched curves of storage, is then existed by first signal of telecommunication
Make a look up in matched curve corresponding to 1550.116nm and be just obtained in that a corresponding OSNR values.
As further preferred embodiment, please continue to refer to Fig. 1 and Fig. 2 is referred to, device also includes：
Heat sink 4, heat sink 4, the first fiber grating 2 and thermal printer head 3 are affixed, wherein heat sink 4 are used to improve heat conduction velocity
And stability.
As further preferred embodiment, processing equipment 6, it is additionally operable to：By controlling 3 pairs of the first optical fiber light of thermal printer head
Grid 2 are heated, and then in the transmission spectrum stopband of the first fiber grating 2 insert phase shift, so that occurring in transmission spectrum stopband
Tunable optical filter.
In specific implementation process, processing equipment 6 by the control to thermal printer head 3, and then can be realized filtering light
Control, three kinds of control modes therein are set forth below, certainly, in specific implementation process, following three kinds of modes is not limited to, separately
Outward, in the case where not conflicting, three kinds of control modes can be applied in combination below.
1. processing equipment 6, specifically for：Optical filter is controlled by the position of the hot spot of control thermal printer head 3
Wavelength.
For example, thermal printer head 3 is made up of multiple compact arranged hot spots, this multiple compact arranged hot spot
The different wave length of optical filter is corresponded to respectively, so processing equipment 6 is when control instruction is sent to thermal printer head driver 5, and can
So that based on the wavelength for needing generation, the corresponding hot spot for controlling thermal printer head 3 is heated.
2. processing equipment 6, specifically for：Optical filter is controlled by the length of the heating region of control thermal printer head 3
Width.
3. processing equipment 6, specifically for：Optical filter is controlled by the temperature of the heating region of control thermal printer head 3
Transmitance.
Used as further preferred embodiment, the bandwidth of the first fiber grating 2 is identical with the bandwidth of the second fiber grating 8,
By circulator Single port is connected with the first fiber grating 2, the structure that the second fiber grating 8 is connected with circulator Two-port netwerk,
The reflectance spectrum passband of the second fiber grating 8 can be utilized to filter the noise of 2 transmission spectrum passband of the first fiber grating, such that it is able to disappear
Except the influence of noise that transmission frequency band in 2 transmission spectrum of the first fiber grating brings.
Further, by the first linear chirped fiber Bragg gratings, three ports light rings 7 and the second linear Zhou
Bragg grating of singing cooperates, and can eliminate and be caused due to the first linear chirped fiber Bragg gratings transmission spectrum passband
ASE (amplified spontaneous emission：Amplified spontaneous emission) noise jamming brought of noise.
Second aspect, based on same inventive concept, the embodiment of the present invention provides a kind of OSNR Monitoring Method, is applied to
Optical signal-to-noise ratio monitoring device in wave division multiplexing WDM system, please continue to refer to Fig. 1, device includes：Optical fiber 1；First fiber grating
2, inscribe in optical fiber 1；Second fiber grating 8, inscribes in optical fiber 1；Thermal printer head 3, for carrying out adding to the first fiber grating 2
Heat；Optical-electrical converter 9；Three ports light rings 7, the Single port of three ports light rings 7 are connected to the first fiber grating 2, and three
The Two-port netwerk of ports light rings 7 is connected to the second fiber grating 8, and three ports of three port photocirculators are connected to opto-electronic conversion
Device 9, refer to Fig. 3, and method includes：
Step S301：The first position heating of control 3 pairs of the first fiber gratings 2 of thermal printer head；
Step S302：First signal of telecommunication that optical-electrical converter 9 is obtained is received, first signal of telecommunication is specially：Optical-electrical converter 9
Collection obtains the optical signal of the filter pass band of first position, and optical signal is carried out the signal of telecommunication obtained by opto-electronic conversion then；
Step S303：First OSNR value of wdm system is determined according to first signal of telecommunication.
Optionally, the first OSNR value of wdm system is determined according to first signal of telecommunication, is specifically included：
The matched curve of first position is obtained, the corresponding relation comprising the signal of telecommunication with OSNR in matched curve；
The first OSNR value is obtained according to searching in the first signal of telecommunication matched curve.
Optionally, before the matched curve corresponding to first position is obtained, method also includes：
Control thermal printer head 3 is heated to first position；
The size of the OSNR at the filter pass band of adjustment first position, and then detect acquisition and multiple different light letters
Make an uproar than corresponding multiple signals of telecommunication；
Corresponding relation based on multiple different OSNRs and multiple signals of telecommunication generates matched curve.
One or more embodiments of the invention at least have the advantages that：
Due in embodiments of the present invention, there is provided the optical signal-to-noise ratio monitoring device in a kind of wave division multiplexing WDM system, bag
Include：Optical fiber；First fiber grating, inscribes in optical fiber；Second fiber grating, inscribes in optical fiber；Thermal printer head, for the first light
Fine grating is heated；Thermal printer head driver, is connected to thermal printer head, for being controlled to thermal printer head by control instruction
System；Processing equipment, is connected to thermal printer head driver, for producing control instruction to thermal printer head driver；Optical-electrical converter；
Three ports light rings, the Single port of three ports light rings are connected to the first fiber grating, two ends of three ports light rings
Mouth is connected to the second fiber grating, and three ports of three port photocirculators are connected to optical-electrical converter；Wherein, produce in processing equipment
After raw the first control instruction control thermal printer head is to the first position heating of the first fiber grating, adopted by optical-electrical converter
Collection obtains the optical signal of the filter pass band of first position, and converts optical signals to the first electric signal transmission to processing equipment；Place
Reason equipment determines the first OSNR value of wdm system according to first signal of telecommunication.As can be seen here, the is obtained according to optical-electrical converter
One signal of telecommunication, it is possible to determine the first OSNR value of wdm system, the device has simple structure, dispersion, polarization insensitive
Advantage, so as to reached measure OSNR when, reduce the technique effect of the requirement to testing equipment.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into the had altered of the scope of the invention and change.
Obviously, those skilled in the art can carry out various changes and modification without deviating from the present invention's to the present invention
Spirit and scope.So, if these modifications of the present invention and modification belong to the model of the claims in the present invention and its equivalent technologies
Within enclosing, then the present invention is also intended to comprising these changes and modification.
Claims (6)
1. the optical signal-to-noise ratio monitoring device in a kind of wave division multiplexing WDM system, it is characterised in that include：
Optical fiber；
First fiber grating, inscribes in the optical fiber；
Second fiber grating, inscribes in the optical fiber；
Thermal printer head, for heating to first fiber grating；
Thermal printer head driver, is connected to the thermal printer head, for being controlled to the thermal printer head by control instruction；
Processing equipment, is connected to the thermal printer head driver, refers to for producing the control to the thermal printer head driver
Order；
Optical-electrical converter；
Three ports light rings, the Single port of three ports light rings are connected to first fiber grating, three end
The Two-port netwerk of mouthful optical circulator is connected to second fiber grating, and three ports of three port photocirculator are connected to described
Optical-electrical converter；
Wherein, the first control instruction for producing in the processing equipment controls the thermal printer head to first fiber grating
After the heating of first position, the optical signal of the filter pass band for obtaining the first position is gathered by the optical-electrical converter, and
The optical signal is converted to into the first electric signal transmission to the processing equipment；The processing equipment is according to first signal of telecommunication
Determine the first OSNR value of the wdm system；
Wherein, the processing equipment, specifically for：Determine the matched curve corresponding to the first position, the matched curve
In the corresponding relation comprising the signal of telecommunication and OSNR；And searched from the matched curve according to first signal of telecommunication and obtain
The first OSNR value；
The processing equipment, is additionally operable to：Control the thermal printer head to heat the first position；Adjust described first
The size of the OSNR at filter pass band put, and then detect acquisition and the corresponding multiple telecommunications of multiple different OSNRs
Number；Corresponding relation based on the plurality of different OSNR and the plurality of signal of telecommunication generates the matched curve.
2. device as claimed in claim 1, it is characterised in that described device also includes：
Heat sink, heat sink, described first fiber grating and the thermal printer head are affixed.
3. device as claimed in claim 1 or 2, it is characterised in that the processing equipment, is additionally operable to：By controlling the heat
Printhead is heated to first fiber grating, and then in the transmission spectrum stopband of first fiber grating inserts phase
Move, so that there is tunable optical filter in the transmission spectrum stopband.
4. device as claimed in claim 3, it is characterised in that the processing equipment, specifically for：
The wavelength of optical filter is controlled by the position of the hot spot of the control thermal printer head；And/or
The width of optical filter is controlled by the length of the heating region of the control thermal printer head；And/or
The transmitance of the optical filter is controlled by the temperature of the heating region of the control thermal printer head.
5. device as claimed in claim 1 or 2, it is characterised in that the bandwidth of first fiber grating and second light
The bandwidth of fine grating is identical.
6. a kind of OSNR Monitoring Method, is applied in the optical signal-to-noise ratio monitoring device in wave division multiplexing WDM system, the dress
Put including：Optical fiber；First fiber grating, inscribes in the optical fiber；Second fiber grating, inscribes in the optical fiber；Thermal printer head,
For heating to first fiber grating；Optical-electrical converter；Three ports light rings, three ports light rings
Single port is connected to first fiber grating, and the Two-port netwerk of three ports light rings is connected to the second optical fiber light
Grid, three ports of three port photocirculator are connected to the optical-electrical converter, it is characterised in that methods described also includes：
Control the thermal printer head to heat the first position of first fiber grating；
First signal of telecommunication that the optical-electrical converter is obtained is received, first signal of telecommunication is specially：The optical-electrical converter is adopted
Collection obtains the optical signal of the filter pass band of the first position, and the optical signal is carried out the telecommunications obtained by opto-electronic conversion then
Number；
First OSNR value of the wdm system is determined according to first signal of telecommunication；
Wherein, the first OSNR value that the wdm system is determined according to first signal of telecommunication, specifically includes：Obtain
The matched curve of the first position, the corresponding relation comprising the signal of telecommunication with OSNR in the matched curve；According to described
First signal of telecommunication is searched from the matched curve and obtains the first OSNR value；
Before the matched curve obtained corresponding to the first position, methods described also includes：Control the hot print
Head is heated to the first position；Adjust the size of the OSNR at the filter pass band of the first position, Jin Erjian
Survey and obtain and the corresponding multiple signals of telecommunication of multiple different OSNRs；Based on the plurality of different OSNR and described many
The corresponding relation of the individual signal of telecommunication generates the matched curve.
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