CN104243024A - Online monitoring method and device for fiber Raman amplifier - Google Patents
Online monitoring method and device for fiber Raman amplifier Download PDFInfo
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- CN104243024A CN104243024A CN201310234707.4A CN201310234707A CN104243024A CN 104243024 A CN104243024 A CN 104243024A CN 201310234707 A CN201310234707 A CN 201310234707A CN 104243024 A CN104243024 A CN 104243024A
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Abstract
The invention discloses an online monitoring device and method for a fiber Raman amplifier. The online monitoring device comprises an intelligent control system and further comprises an FP cavity with tunable transmission frequency, an optical detector and a master control module. The FP cavity scans a signal channel and then outputs a signal to the optical detector, and the optical detector converts the signal to an electrical signal and sends the electrical signal to the master control module. The online monitoring device and method are low in cost, easy to implement and convenient to commercialize and popularize; the online monitoring device and method are less influenced by the environment, the signal scanning process is dynamic, signal scanning only relates to relative tuning quantities of controlled variables such as heat, electricity and magnetism, and the tuning range is small, is not influenced by the environment and is easy to control; the online monitoring device and method are wide in application and can be applied to any single channel system with an unlimited wavelength or any multichannel system with fixed-interval wavelengths.
Description
Technical field
the present invention relates to optical communication field, particularly relate to distributed optical fiber Raman amplifier field.
Background technology
Fiber amplifier is module crucial in light communication system, along with 40Gb/s light communication system starts a large amount of deployment, the practical application of 100Gb/s and even 400Gb/s system is also brought into schedule gradually, estimate that following 40Gb/s to have gone up in system more than 50% and needed to use fiber Raman amplifier or mixer amplifier (raman amplifier and erbium-doped fiber amplifier combinationally use), this is because raman amplifier has low noise, high bandwidth, the feature of low nonlinear effects.
Fiber Raman amplifier generally adopts distributed air-defense, namely amplification process utilizes Raman effect to complete on the transmission fiber, relative to traditional discrete erbium-doped fiber amplifier, raman amplifier requires higher pumping launched power, due to distributed characteristic, input optical signal power detection cannot complete in inside modules, thus new problem served by band: 1) when Transmission Fibers ruptures, because inside modules cannot detect this information, pumping can be in open mode always, and this all can cause very large potential safety hazard for user and environment; 2) when signal transmission is lost, Raman effect still can produce spontaneous emission light, and these spontaneous radiations can be amplified step by step by post-amplifier, finally arrives receiving terminal and causes severe jamming to system.In order to overcome the above problems, Chinese patent CN1404237A describes a kind of method utilizing Interleaver device separate signal light and spontaneous emission light, can effectively overcome the above problems, but it is high that its shortcoming is cost, package dimension is large, is unfavorable for the small form factor requirements of extensive use and following module; And US Patent No. .6,423,963 utilize extra monitor channel to judge the break-make of optical fiber, but cannot judge the presence or absence of flashlight, and not all light communication system has loading monitor channel, the practicality of this method and versatility are very limited.
Summary of the invention
The invention provides a kind of on-line monitoring device and method of fiber Raman amplifier, adopt tunable optical FP chamber, scan a little frequency interval, the distribution of different transmission spectrum intensity in time domain can be exported, judge noly there is useful signal input by different distribution shapes.Overcome Problems existing in above-mentioned technology, cost is low, is easy to realize, and is convenient to promote and commercialization.
The present invention realizes by the following technical solutions: a kind of on-line monitoring device of fiber Raman amplifier, comprise intelligent control system, it comprises again a tunable FP chamber of frequencies of transmission, photo-detector and main control module, photo-detector is outputed signal to after the sweep signal passage of described FP chamber, described photo-detector is converted into the signal of telecommunication, re-sends to main control module.
Preferably, described FP chamber and photo-detector are encapsulated in a housing, or individual packages.
An on-line monitoring way for fiber Raman amplifier, comprises the following steps:
Step 1, applying are tuned in FP chamber;
Step 2, monitor signal input monitoring device, FP chamber is carried out multichannel to monitor signal and is scanned simultaneously;
Step 3, according to scanning result, FP chamber exports the distribution of transmission spectrum intensity in time domain, and converts the signal of telecommunication to by photo-detector;
Step 4, main control module receive the signal of telecommunication, judge whether there is useful signal in main optical path, and control the unlatching of pumping laser group or close.
Preferably, in step 1, tuning methods is heating; Or in FP chamber in-built electrical luminescent material, apply the curtage that continuously changes on electrooptical material; Or in FP chamber built-in magneto-optic memory technique, apply the magnetic field that continuously changes on magneto-optic memory technique.
Cost of the present invention is low, is easy to realize, and is convenient to promote and commercialization; Affected by environment little, signal scanning is a dynamic process, and only and controlled quentity controlled variable, such as the relatively tuning amount of heat, electricity, magnetic is correlated with, and tuning range is less, not affected by environment, is convenient to control; Application is wide, can be applicable to the multichannel system of the unrestricted single-channel system of any wavelength or fixed intervals wavelength.
Accompanying drawing explanation
Fig. 1 is the application principle figure of raman amplifier;
Principle schematic when Fig. 2 is the channel alignment of specific embodiments of the invention;
Principle schematic when Fig. 3 is the passage misalignment of specific embodiments of the invention;
Principle schematic when Fig. 4 is the no signal light of specific embodiments of the invention;
Fig. 5 is the time domain spectral line of transmitted light intensity when having a flashlight of the present invention;
The time domain spectral line of transmitted light intensity when Fig. 6 is no signal light of the present invention;
drawing reference numeral illustrates: 1, Transmission Fibers; 2, wavelength division multiplexer; 3, light splitting coupler; 4, intelligent control system; 5, pumping laser group; 6, pump light; 7, light is inputted; 8, signal output part; 9, signal; 10, detection signal; 100, input signal light; 101, ASE; 11, opening/closing laser group signal; 12, laser signal; 13, FP chamber; 14, photo-detector; 15, main control module; 16, the signal of telecommunication; 171, light is exported; 172, light is exported; 173, light is exported; 19, tuning.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
As shown in Figure 1, distributed optical fiber Raman amplifier application is in fiber optic communication systems described.Transmission Fibers 1 connects with wavelength division multiplexer 2 input, and wavelength division multiplexer 2 is three fiber port devices, and its pumping input is connected with pumping laser group 5 output; Its signal output part 8 is connected with light splitting coupler 3, light splitting coupler 3 has two outputs, an output is for exporting the signal after amplification 9, and another output is connected with intelligent control system 4, and intelligent control system 4 controls the Kai Heguan of pumping laser group 5 by detection signal 10.
Concrete process is as follows: input optical signal 7 is forward transmission in Transmission Fibers 1, pump light 6 reverse transfer, flashlight 7 is exaggerated through Raman effect under the effect of pump light 6 in Transmission Fibers 1, flashlight after amplification enters into light splitting coupler 3 after wavelength division multiplexer 2, flashlight after amplification is divided into two bundles by light splitting coupler 3, one end that vast scale exports exports as output signal 9, one end that small scale exports enters intelligent control system 4 as detection signal 10, intelligent control system 4 utilizes detection signal 10 to judge, if the result judged illustrates to there is flashlight, then open pumping laser group 5, otherwise, then close pumping laser group 5.
As Fig. 2,3, shown in 4, main what describe is the operation principle of the specific embodiment of the invention.The on-line monitoring device of fiber Raman amplifier, comprise intelligent control system, intelligent control system comprises again frequencies of transmission 13, one, a tunable FP chamber photo-detector 14 and main control module 15, photo-detector 14 is outputed signal to after the sweep signal passage of FP chamber 13, photo-detector 14 is converted into the signal of telecommunication, re-sends to main control module 15.FP chamber 13 and photo-detector 14 can be encapsulated in a housing, also can individual packages.
Further, a kind of on-line monitoring way of fiber Raman amplifier, comprises the following steps:
Step 1, applying are tuned in FP chamber;
Step 2, monitor signal input monitoring device, FP chamber is carried out multichannel to monitor signal and is scanned simultaneously, scans a little frequency interval;
Step 3, according to scanning result, FP chamber exports the distribution of transmission spectrum intensity in time domain, and converts the signal of telecommunication to by photo-detector;
Step 4, main control module receive the signal of telecommunication, judge whether there is useful signal in main optical path, and control the unlatching of pumping laser group or close.
FP chamber applies tuning methods, such as: by heating; Or in FP chamber in-built electrical luminescent material, apply the curtage that continuously changes on electrooptical material; Or in FP chamber built-in magneto-optic memory technique, apply the magnetic field that continuously changes on magneto-optic memory technique.By continuously changing the refractive index of material, thus realize the output spectral line in the whole FP chamber of continuous tuning.
When there being signal to input in system, the optics FP chamber 13 set will be carried out multichannel to signal and be scanned simultaneously, wherein channel spacing is determined by optics FP chamber 13 itself, i.e. the Free Spectral Range FSR in FP chamber 13, by the input signal in playback system and ASE noise in scanning process.If system is single-wavelength working, in scanning process, when FP chamber 13 arbitrary through passage and input channel on time, then export stronger flashlight, and the scanning near signalling channel can only export faint ASE light, obtain like this in time-domain, having a unexpected increase through the strength signal in FP chamber 13; If system be multichannel situation and channel spacing is the same time, same, in scanning process, always have simultaneously multiple wavelength aim at FP chamber 13 through peak, export stronger flashlight, faint flashlight is then only detected in flashlight both sides, unlike, may can export multiple stronger peak value in time-domain in multichannel situation; If there is not flashlight, no matter for multichannel or single channel, be all export spontaneous emission light ASE, because spontaneous emission light is continuous and smooth among a small circle, there is not stronger peak value by the time spectral line obtained after the scanning of FP chamber, so just effectively can distinguish in light communication system whether flashlight is still only ASE light.
As shown in Figure 2, be principle schematic during channel alignment.Input signal light 100 is frequency signal waveform at equal intervals, apply tuning 19 on optics FP chamber 13, at time t1 point, equally spaced series of wavelengths is aimed at and exports light 171, output light 171 enters photo-detector 14 and is converted into the signal of telecommunication 16, with reference to time t1 in figure 5 and t3 time point, this strength signal can be delivered to main control module 15.Judge that main optical path there is flashlight, export and open pumping laser group signal 11.
As shown in Figure 3, be principle schematic during passage misalignment.Display departs from input channel interval during when being tuned at t2 time point, obtain ASE light intensity and export light 172, with reference to t2 point light intensity in figure 5, be converted to electrical signal transfer equally to main control module 15, main control module 15 is by the distribution map 5 of transmitted light intensity in time-domain, judge that main optical path there is flashlight, export and open pumping laser group signal 11.
Be all the ASE light time when there is not flashlight in light path, as shown in Figure 4, what the result of scanning obtained is export spectral line in the intensity that time-domain is smooth, as shown in Figure 6, now judges that light path no signal light exists, output closedown laser pumping signal 11.
Above scanning process repeats, and scanning frequency gap length can be changed by software.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; in the form and details the present invention is made a variety of changes, be protection scope of the present invention.
Claims (4)
1. the on-line monitoring device of a fiber Raman amplifier, it is characterized in that, comprise intelligent control system, it comprises again a tunable FP chamber of frequencies of transmission, photo-detector and main control module, output signal to photo-detector after the sweep signal passage of described FP chamber, described photo-detector is converted into the signal of telecommunication, re-sends to main control module.
2. the on-line monitoring device of a kind of fiber Raman amplifier as claimed in claim 1, is characterized in that, described FP chamber and photo-detector are encapsulated in a housing, or individual packages.
3. an on-line monitoring way for fiber Raman amplifier, is characterized in that, comprise the following steps:
Step 1, applying are tuned in FP chamber;
Step 2, monitor signal input monitoring device, FP chamber is carried out multichannel to monitor signal and is scanned simultaneously;
Step 3, according to scanning result, FP chamber exports the distribution of transmission spectrum intensity in time domain, and converts the signal of telecommunication to by photo-detector;
Step 4, main control module receive the signal of telecommunication, judge whether there is useful signal in main optical path, and control the unlatching of pumping laser group or close.
4. the on-line monitoring way of a kind of fiber Raman amplifier as claimed in claim 3, is characterised in that, in step 1, tuning methods is heating; Or in FP chamber in-built electrical luminescent material, apply the curtage that continuously changes on electrooptical material; Or in FP chamber built-in magneto-optic memory technique, apply the magnetic field that continuously changes on magneto-optic memory technique.
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Citations (7)
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| US4887031A (en) * | 1984-08-06 | 1989-12-12 | Siemens Aktiengesellschaft | Method and apparatus for detecting and imaging measuring points that have a defined signal progression |
| CN101263938A (en) * | 2008-05-08 | 2008-09-17 | 天津工业大学 | Intelligent clothing capable of detecting human body temperature and manufacturing method thereof |
| CN201189172Y (en) * | 2008-05-08 | 2009-02-04 | 天津工业大学 | Body temperature detection intelligent clothes |
| CN101832791A (en) * | 2010-04-13 | 2010-09-15 | 浙江大学 | Fiber grating sensor wavelength demodulating system based on C8051F320 singlechip |
| CN102738694A (en) * | 2012-06-25 | 2012-10-17 | 中国科学院上海技术物理研究所 | Method for realizing laser frequency stabilization by utilizing Fabry-Perot (F-P) interferometer |
| CN102735270A (en) * | 2012-06-29 | 2012-10-17 | 西北核技术研究所 | Wavelength-scanning-based active fiber Bragg grating time domain demodulating device |
| CN102813528A (en) * | 2012-09-10 | 2012-12-12 | 天津工业大学 | Wavelength demodulation system, heart sound detection device and application |
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2013
- 2013-06-14 CN CN201310234707.4A patent/CN104243024A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4887031A (en) * | 1984-08-06 | 1989-12-12 | Siemens Aktiengesellschaft | Method and apparatus for detecting and imaging measuring points that have a defined signal progression |
| CN101263938A (en) * | 2008-05-08 | 2008-09-17 | 天津工业大学 | Intelligent clothing capable of detecting human body temperature and manufacturing method thereof |
| CN201189172Y (en) * | 2008-05-08 | 2009-02-04 | 天津工业大学 | Body temperature detection intelligent clothes |
| CN101832791A (en) * | 2010-04-13 | 2010-09-15 | 浙江大学 | Fiber grating sensor wavelength demodulating system based on C8051F320 singlechip |
| CN102738694A (en) * | 2012-06-25 | 2012-10-17 | 中国科学院上海技术物理研究所 | Method for realizing laser frequency stabilization by utilizing Fabry-Perot (F-P) interferometer |
| CN102735270A (en) * | 2012-06-29 | 2012-10-17 | 西北核技术研究所 | Wavelength-scanning-based active fiber Bragg grating time domain demodulating device |
| CN102813528A (en) * | 2012-09-10 | 2012-12-12 | 天津工业大学 | Wavelength demodulation system, heart sound detection device and application |
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