CN101145853B - An instantaneous status determination device for Erbium doped optical fiber amplifier - Google Patents
An instantaneous status determination device for Erbium doped optical fiber amplifier Download PDFInfo
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- CN101145853B CN101145853B CN2007100990177A CN200710099017A CN101145853B CN 101145853 B CN101145853 B CN 101145853B CN 2007100990177 A CN2007100990177 A CN 2007100990177A CN 200710099017 A CN200710099017 A CN 200710099017A CN 101145853 B CN101145853 B CN 101145853B
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Abstract
The invention discloses an EDFA transient judgment device. The invention comprises an optical power optical-electric conversion module used to converse an optical power optical signal into an optical power electric signal and transmit the optical power electric signal to an optical power sampling module, a threshold setting module and a transient judgment module; the optical power sampling module and the threshold setting module used to sample the optical power electric signal, set the transient generation threshold according to the sampling value, as well as transmit the transient generation threshold to the transient judgment module on a certain time after the sampling begins; the transient judgment module used to compare the optical power electric signal and the transient generation threshold signal and generate and send out the transient judgment signal. The invention separates the power collection and the transient judgment, and applies a low-speed collection converter and a high-speed simulating judgment device so as to realize high judgment speed and low cost.
Description
Technical field
The present invention relates to optical communication field, particularly a kind of erbium-doped fiber amplifier (Erbium-dopedOptical Fiber Amplifer, EDFA) device of judging transient state.
Background technology
EDFA has the following advantages: transparent to data form and speed; The big noise that gains is little, and noise factor is near quantum limit; Directly light signal is amplified, saved electric regenerative repeater, provide cost savings; Gain bandwidth is big, has enlarged transmission capacity.These advantages make that EDFA has obtained using widely in optical communication, and have quickened the development of optical communication.
Count by the optical channel of EDFA increase or minimizing, passive loss change, when network protection is switched, channel power can produce the disturbance of submicrosecond magnitude, thereby has brought the problem of EDFA gain transient response.Particularly when the optical channel number reduced, this problem was particularly serious.If can not carry out enough control and compensation to power fluctuation, cumulative effect can increase and increase along with number of amplifier purpose on the transmission line, this might influence the overall performance of system, make transmission parameter depart from optimal value, reduce the signal to noise ratio of light signal, simultaneously excessive luminous power also can cause nonlinear effect, as from phase modulated and four wave mixing.
At wavelength division multiplexing (Wavelength Division Multiplexing, WDM) under the system applies condition, especially port number is more, and there is optical add/drop multiplexer (Optical ADD-Drop Multiplexer, OADM), optical cross connection device (Optical Cross Connector, OXC) time, the increase and decrease of number of active lanes is more frequent, and the problem of EDFA gain transient response is also more serious.
Solve the problem of EDFA gain transient response, mainly contain following two kinds of controlling schemes:
Unified processing scheme: do not distinguish stable state and transient state situation, directly carry out high-speed feedback control.Advantage is that scheme is simple, and shortcoming is gain controlling gain controlling contradiction between fast accurately and under the transient state situation under the good stable situation of intractable;
The branch process scheme: distinguish stable state and transient state situation, adopts two kinds of different control methods to control respectively, advantage is to have solved the contradiction of gain controlling between quick accurately and under the transient state situation of gain controlling under the stable situation, and shortcoming is the scheme complexity.
Since under the stable situation gain controlling accurately and under the transient state situation contradiction of gain controlling between fast be the problem that should solve in the EDFA gain controlling, so concrete application of great majority realizes adopting the branch process scheme at present.In the branch process scheme, the quick judgement that the transient state situation takes place has just become a very crucial technology.
Fig. 1 is the apparatus structure schematic diagram of EDFA judging transient state in the prior art.As shown in Figure 1, luminous power photoelectric conversion module 1 is converted to the luminous power signal of telecommunication with the luminous power light signal, and the Output optical power signal of telecommunication is to luminous power sampling and judging transient state module 2, luminous power sampling and judging transient state module 2 are by high speed analog-digital conversion (Analog-Digital, AD) sampler is sampled to the luminous power signal of telecommunication, and the data that collect are carried out logic determines, and produce the judging transient state signal, use for the EDFA gain control module.
This method that power collecting and judging transient state are integrated in one depends critically upon the performance of AD sampler and the disposal ability of logic determines, time decision is at least 2 AD sample conversion times and adds the logic determines time, generally more than ten microsecond magnitudes, so judgement speed is slow.And owing to adopted high-speed AD acquisition device and high speed logic processor, cost is than higher.
Summary of the invention
Technical problem to be solved by this invention provides a kind of device of EDFA judging transient state, to improve judgement speed, reduces cost.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of device of EDFA judging transient state comprises:
The luminous power photoelectric conversion module is used for the luminous power light signal is converted to the luminous power signal of telecommunication, and the Output optical power signal of telecommunication is to luminous power sampling and threshold setting module, judging transient state module;
Luminous power sampling and threshold setting module are used for the luminous power signal of telecommunication is sampled, and according to sampled value transient generation threshold are set, and after the special time of sampling beginning, the output transient generation threshold is to the judging transient state module;
The judging transient state module is used for the luminous power signal of telecommunication and transient generation threshold signal are compared, and produces judging transient state signal and output.
Preferably, described luminous power sampling and threshold setting module specifically comprise:
The low speed modulus switching device is used for the luminous power signal of telecommunication is sampled, and the output sampled value is to the threshold setting module;
The threshold setting module is used for according to sampled value transient generation threshold being set, and the output transient generation threshold is to the judging transient state module.
Preferably, described luminous power sampling and threshold setting module specifically comprise:
Amplifier voltage transitions and threshold setting module are used for the luminous power signal of telecommunication is sampled, and according to sampled value transient generation threshold are set, and the output transient generation threshold is to low pass filter;
Low pass filter after being used for transient generation threshold carried out delay process, outputs to the judging transient state module.
Preferably, sampling of described luminous power and threshold setting module with transient generation threshold be arranged on described sampled value be benchmark just/the negative threshold value place.
Preferably, described threshold value is 1dB.
Preferably, described judging transient state module is an analog comparator circuit.
Preferably, described analog comparator is the comparator of whirling that stagnates.
Compared with prior art, the invention has the beneficial effects as follows:
Prior art is integrated in one power collecting and judging transient state, and judgement speed is slow, and owing to adopted high speed acquisition transducer and high speed logic processor, cost is than higher; The present invention separates power collecting and judging transient state, and adopts low speed to gather transducer and simulate decision device with high speed, and judgement speed is fast, and is with low cost.
Description of drawings
Fig. 1 is the apparatus structure schematic diagram of EDFA judging transient state in the prior art;
Fig. 2 is the apparatus structure schematic diagram of the EDFA judging transient state of preferred embodiment of the present invention;
Fig. 3 is the schematic diagram of a kind of implementation of luminous power sampling and threshold setting module among Fig. 2;
Fig. 4 is the schematic diagram of the another kind of implementation of luminous power sampling and threshold setting module among Fig. 2;
Fig. 5 is the schematic diagram of a kind of implementation of judging transient state module among Fig. 2.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is constant according to luminous power substantially constant under the EDFA stable situation, transient state situation switch speed is in the work characteristics of microsecond to the millisecond magnitude, the luminous power transient state is taken place in judgement collection and judging module fractionation are come, and have proposed a kind of device of judging transient state fast.Employing is gathered switching device at a slow speed and is realized the collection of the luminous power signal of telecommunication and the setting of decision threshold, the final judgement of simulation judgement device realization at a high speed.Like this, both can avoid adopting high-speed AD device and high speed logic judgement device, the speed of adjudicating simultaneously only depends on the response time of simulating decision device at a high speed, reaches hundred nanosecond orders.And circuit is simple, is easy to realize.
Please refer to Fig. 2, the device of the EDFA judging transient state of preferred embodiment of the present invention comprises: luminous power photoelectric conversion module 10, luminous power sampling and threshold setting module 20, judging transient state module 30.
Luminous power photoelectric conversion module 10 is converted to the luminous power signal of telecommunication with the luminous power light signal, and the Output optical power signal of telecommunication is to luminous power sampling and threshold setting module 20, judging transient state module 30.
Luminous power sampling and 20 pairs of luminous power signals of telecommunication of threshold setting module are sampled, and according to sampled value transient generation threshold are set, and after the special time of sampling beginning, the output transient generation threshold is to judging transient state module 30.Because a situation arises is for the transient state of EDFA: to the millisecond magnitude, the optical power change amount surpasses threshold value in microsecond, for example surpass ± 1dB, so after the power collecting conversion, with transient generation threshold be arranged on luminous power collection value ± the 1dB place; On the other hand, the introducing of time delay is in order to keep this transient generation threshold to keep constant in special time, for example keep constant in the time of millisecond magnitude.This method will be gathered the conversion setting at a slow speed and be combined with the characteristics of adjudicating fast, realize the accurate setting of transient generation threshold and carrying out fast of judgement simultaneously.
Judging transient state module 30 adopts simulation judgement device at a high speed, and the luminous power signal of telecommunication and transient generation threshold signal are compared, and produces the judging transient state signal, uses for the EDFA gain control module.
Please refer to Fig. 3, be the schematic diagram of a kind of implementation of luminous power sampling and threshold setting module 20, be based on the hardware implementations of low speed AD device.Low speed AD converter part 21 is gathered the luminous power signals of telecommunication, and sampled data is outputed to threshold setting module 22, and threshold setting module 22 is provided with transient generation threshold according to sampled value, and outputs to judging transient state module 30.The employing of low speed AD has realized the collection of the luminous power signal of telecommunication and the time delay function of transient generation threshold simultaneously.
Please refer to Fig. 4, be the schematic diagram of the another kind of implementation of luminous power sampling and threshold setting module 20, be based on the hard-wired scheme of operational amplifier.Adopt amplifier voltage transitions and threshold setting module 23 to realize the collection of the luminous power signal of telecommunication, according to sampled value transient generation threshold is set, low pass filter 24 is realized the transient generation threshold that is provided with is carried out offering judging transient state module 30 after the delay process of millisecond magnitude.
Please refer to Fig. 5, be the schematic diagram of a kind of implementation of judging transient state module 30.What judging transient state module 30 adopted is analog comparator circuit, and the response speed of judgement depends on the response speed of analog comparator fully, with regard to present technology, can reach above response speed of hundred nanoseconds.
In addition, take place repeatedly on a power points for fear of judging transient state, judging transient state module 30 can also adopt the stagnant comparator of whirling to realize.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. the device of an erbium-doped fiber amplifier judging transient state is characterized in that, comprising:
The luminous power photoelectric conversion module is used for the luminous power light signal is converted to the luminous power signal of telecommunication, and the Output optical power signal of telecommunication is to luminous power sampling and threshold setting module, judging transient state module;
Luminous power sampling and threshold setting module are used for the luminous power signal of telecommunication is sampled, and according to sampled value transient generation threshold are set, and after the special time of sampling beginning, the output transient generation threshold is to the judging transient state module;
The judging transient state module is used for the luminous power signal of telecommunication and transient generation threshold signal are compared, and produces judging transient state signal and output.
2. the device of erbium-doped fiber amplifier judging transient state as claimed in claim 1 is characterized in that, described luminous power sampling and threshold setting module specifically comprise:
The low speed modulus switching device is used for the luminous power signal of telecommunication is sampled, and the output sampled value is to the threshold setting module;
The threshold setting module is used for according to sampled value transient generation threshold being set, and the output transient generation threshold is to the judging transient state module.
3. the device of erbium-doped fiber amplifier judging transient state as claimed in claim 1 is characterized in that, described luminous power sampling and threshold setting module specifically comprise:
Amplifier voltage transitions and threshold setting module are used for the luminous power signal of telecommunication is sampled, and according to sampled value transient generation threshold are set, and the output transient generation threshold is to low pass filter;
Low pass filter after being used for transient generation threshold carried out delay process, outputs to the judging transient state module.
4. the device of erbium-doped fiber amplifier judging transient state as claimed in claim 1 is characterized in that:
Sampling of described luminous power and threshold setting module with transient generation threshold be arranged on described sampled value be benchmark just/the negative threshold value place.
5. the device of erbium-doped fiber amplifier judging transient state as claimed in claim 4 is characterized in that:
Described threshold value is 1dB.
6. the device of erbium-doped fiber amplifier judging transient state as claimed in claim 1 is characterized in that:
Described judging transient state module is an analog comparator circuit.
7. the device of erbium-doped fiber amplifier judging transient state as claimed in claim 6 is characterized in that:
Described analog comparator is the comparator of whirling that stagnates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100990177A CN101145853B (en) | 2007-05-08 | 2007-05-08 | An instantaneous status determination device for Erbium doped optical fiber amplifier |
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| CN2007100990177A CN101145853B (en) | 2007-05-08 | 2007-05-08 | An instantaneous status determination device for Erbium doped optical fiber amplifier |
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| CN101145853B true CN101145853B (en) | 2011-06-22 |
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| CN102706537A (en) * | 2012-05-09 | 2012-10-03 | 武汉光迅科技股份有限公司 | Device for detecting transient state effect of erbium-doped fiber amplifier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430370A (en) * | 2001-12-29 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Erbium adulterated optical fiber amplifier gain control apparatus |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430370A (en) * | 2001-12-29 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Erbium adulterated optical fiber amplifier gain control apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 宋开等.掺铒光纤放大器的频率响应和瞬态增益.光学学报.1999,19(5),616-620. * |
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