CN1514564A - Method of line attenuation self adaptive and path equilibrium automatic adjustment of light interleave multiplexer and its device - Google Patents
Method of line attenuation self adaptive and path equilibrium automatic adjustment of light interleave multiplexer and its device Download PDFInfo
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- CN1514564A CN1514564A CNA031252974A CN03125297A CN1514564A CN 1514564 A CN1514564 A CN 1514564A CN A031252974 A CNA031252974 A CN A031252974A CN 03125297 A CN03125297 A CN 03125297A CN 1514564 A CN1514564 A CN 1514564A
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Abstract
The invention relates to optical wavelength division multiplexing transmission system, applying to transmission system of optical add and drop multiplexer (OADM) as well as to node of OADM. The device includes following parts: (1) unit for monitoring optical power composed of optoelectronic conversion and amplifying circuit in optical path; (2) arithmetic/control circuit unit composed of single chip, data acquisition and variable optical attenuator; (3) OADM and optical amplifier being as important part of node of OADM. The invention only adds one set of control circuit and variable optical attenuator, providing features of low cost simple structure, easy of adjusting device and setting parameters, fast response speed, small insertion loss. The technical scheme is not affected by number of optical path.
Description
Technical field
The present invention relates to optical wavelength-division multiplex (WDM) transmission system, be mainly used in Optical Add Drop Multiplexer (OADM) transmission system, also be applicable to the OADM node of wave division multiplexing transmission system.
Background technology
1, the signal of WDM equipment and Optical Add Drop Multiplexer OADM equipment is by Optical Fiber Transmission.Along with wearing out of optical fiber, and the variation of line conditions, the attenuation of optical link will produce certain change, will cause system to receive the variation of Optical Signal To Noise Ratio thus, and then influences the transmission performance of system.Simultaneously, at OADM equipment or comprise in the WDM equipment of OADM node, because the variation of optical link attenuation, can cause down the optical power change of words light path and straight-through light path, and the luminous power that goes up the words light path keeps stable, will cause each path luminous power of apparatus output signal can't keep balance like this, influence the flatness of light path.When serious even the luminous power of some light path is seriously descended, the rapid deterioration of Optical Signal To Noise Ratio index causes part light path communication blocking-up.
In wdm system,, generally all adopt the way of configuration variable optical attenuator on image intensifer to deal with to the variation of optical link attenuation.Because image intensifer can't be monitored the optical power change of each path, so just can't distinguish the light path number and increase and decrease the optical power change that the optical power change brought and line hepatitis consumption variation bring.When the luminous power generation acute variation of part light path, it not only can not carry out suitable analyzing and processing as the case may be like this, also can make originally quality preferably modulating signal get very poor.Though this situation is few, under the requirement of carrier class transmission quality, also be a very serious technology hidden danger.
2 and the light path flatness problem, general considerations all is not enough to influence its transmission performance in the point-to-point transmission system, because the variation of line hepatitis consumption is balanced to the influence of each light path transmission signals.And in the wavelength-division multiplex system of band OADM node, owing to have only the light path that has passed through the circuit transmission just influenced, and the light path of talking about on the OADM node is not subjected to the influence of leading portion optical link attenuation, on the receiving terminal of back, the inconsistent of each light path will occur like this, and then influence light path flatness technical indicator.Particularly in the OADM system of band road protection; because system is when the optical link fault occurring; can change the optical transmission route automatically; internodal attenuation can produce great variation; and the light path that has can be by the protection route transmission; the light path that has but can be by the protection route transmission, and the problem of light path flatness will be more serious like this.General employing dynamic gain be to address this problem at present and method and path power adjustment method adjusted.
1) new technology of dynamic gain adjustment method for developing in recent years, it adopts integrated optics technique, integrated quite complicated optics dynamic function in the device of a smaller size smaller, the optical transfer system of device can be changed according to the adjustment parameter that presets, and then the higher light passband signal of inhibition power, and the less light passband signal of luminous power is not suppressed or few the inhibition, thereby obtain the purpose of exporting the light path planarization.
2) path power adjustment rule is with each light path signal partial wave, adjusts Output optical power with the tunable optical attenuator respectively again, and then closes ripple.
These two kinds of methods all have the effect of path flatness adjustment preferably, but complex structure is with high costs.Path power adjustment method also has the shortcoming that volume is big, attenuation is big.And to the OADM system; because each station all has light signal up and down basically; and each light highway section all has the possibility that Loop Protection is switched; realize that light path flatness adjustment preferably just need all carry out the flatness adjustment in two transmission directions of each node, the angle cost from the angle of cost and outfit of equipment performance is all too big like this.Particularly path power is adjusted method, because Insertion Loss is too big, also can produce bigger influence to the system transmissions performance.
In addition,, caused on the transmission characteristic band of digital transmission system the rule of many analogue systems, caused the dynamic range of system line attenuation to decline to a great extent owing to adopted Optical Amplification Technology in a large number in dense wave division multipurpose (DWDM) system.The variation of line hepatitis consumption and the variation of transmission route simultaneously all can cause the light signal of transmission channel to change, and the luminous power that goes up the words signal of OADM node remains unchanged substantially, will cause the light signal flatness deterioration on the follow-up circuit like this, influence the transmission performance of part light path.
Summary of the invention
Purpose of the present invention just is to overcome the problem and shortage that above-mentioned prior art exists, and a kind of line hepatitis consumption self adaptation and self-adjusting method of channel equalization and device thereof of Optical Add/Drop Multiplexer are provided.
The object of the present invention is achieved like this:
This device mainly is made up of following several parts: the one, and the optical power monitoring part that the opto-electronic conversion of each light path and amplifying circuit constitute, the 2nd, the computing/control circuit part that constitutes by single-chip microcomputer, data acquisition and variable optical attenuator (voa), the 3rd, optical add/drop multiplexer (OAD) and image intensifer are as the vitals of OADM node.
Optical power monitoring part is monitored in real time to input optical signal, each time words path of optical add/drop multiplexer and the luminous power of talking about path on each.Identification meets the requirements in the flatness that system adjusts the output signal of each node of back, and the luminous power of last words light path keeps under the constant condition substantially, single-chip microcomputer is judged and gone up the average light power of talking about path with each that light arranged is that reference value is (during supreme words light signal, preset a reference light power), judge and calculate the average light power of each time words path simultaneously, compare again (when not descending the words path, monitoring luminous power with the key light path is worth as a comparison), judge the variation of line hepatitis consumption according to this variation of comparing difference, control the increase and decrease of the attenuation of the preceding VOA of optical add/drop multiplexer [or light preamplifier (OPA)] in view of the above, and the accuracy of regulating can be set by the user with the deviate of presetting, and reports the attenuation of VOA.Because the monitoring of luminous power is carried out in real time, event can be caught the variation of line hepatitis consumption at any time and be adjusted, the luminous power of words path is remained unchanged substantially, reduce the influence of circuit light decay consumption variation, also can keep the path flatness index simultaneously and remain unchanged substantially system.
When the words light path is all unglazed under all, get:
Average every path is words luminous power=total input optical power/always import average Insertion Loss of words path under light path number-OAD down
When having down the words light path there is the light time, gets:
Average every path is words luminous power=the have mean value of talking about the light path luminous power light under down
When the words light path is all unglazed on all, get:
Talk about luminous power=preset value (get+3dBm～-27dBm between) on average every path
When having down the words light path there is the light time, gets:
Talk about the mean value of luminous power=have words light path luminous power on the light on average every path
The criterion that VOA adjusts:
1) when average every path was down talked about luminous power+luminous power side-play amount＞VOA on words luminous power-average every path and regulated deviation, should control VOA increased its loss.
2) when talk about on luminous power under average every path-average every path luminous power+luminous power side-play amount＜-when VOA regulates deviation, should control VOA and reduce its loss.
3) regulate when talking about luminous power+luminous power side-play amount＜VOA on deviation＜average every path input optical power-average every path and regulating deviation as-VOA, the attenuation of VOA remains unchanged.
As shown in Figure 1, the input light of key light path is at first given adjustable optical attenuator (VOA) 1 and is carried out the luminous power feedback adjusting, give light preamplifier (OPA) again and other function element 2 carries out light amplification or some other processing, give optical add/drop multiplexer (OAD) 3 again and carry out Optical Add Drop Multiplexer.The key light input signal of beam split, opto-electronic conversion and 4 pairs of optical add/drop multiplexers of amplifier (OAD) 3 and each are talked about light signal up and down and are carried out optical power monitoring.And give single-chip microcomputer with Monitoring Data by data acquisition circuit and data acquisition unit 6 carries out calculation process.Judge whether the attenuation of needs adjustment adjustable optical attenuators (VOA) 1 according to operation result, and how to adjust its attenuation and change, again by 5 controls of VOA driver and driving adjustable optical attenuator (VOA) 1 motion, make down words signal or average every path luminous power remain unchanged substantially (can not have light preamplifier and other function element 2 here, also they can be placed variable optical attenuator (voa) 1 preceding or both sides) with the input optical power of regulating optical add/drop multiplexer (OAD) 3.So just can realize the adaptation function of line hepatitis consumption.Also remain unchanged substantially owing to average every path luminous power of through connect signal is the same with average every path luminous power of talking about signal down simultaneously, and the luminous power substantially constant of last words signal, so when having realized that the apparatus self-adaptation line hepatitis consumption changes, also realized the automatic adjustment function of light path equilibrium.
Wherein beam split, opto-electronic conversion and amplifier section are each light path one tunnel, and its inside constitutes as shown in Figure 5,
The present invention has the following advantages and good effect:
1) because the words that go up of OAD are the parts that general OAD equipment all has with following words path optical power monitoring, the present invention has only increased by one and has overlapped control circuit and adjustable optical attenuator, thus have with low cost, characteristic of simple structure.
2) the present invention unites the self adaptation adjustment of line hepatitis consumption and the automatic adjustment of light path flatness, and this is that other technologies are not available.
3) because the present invention will monitor with control is integrated on the OAD dish, thus the variation of the caused optical channel flatness of the variation of transmission route also in its adjustment control range, this be the other technologies scheme unapproachable.
4) technical scheme that the present invention carries is not transmitted the influence that the light path number changes, and more current optical amplifier technology scheme with band VOA commonly used is superior.
5) equipment adjustment and parameter are provided with simply, and response speed is fast, are easier to be accepted by the user than the dynamic gain adjustment technology.
6) mate for adjusting luminous power in image intensifer or OAD, generally all need add an optical attenuator in its front, so adjusting the law technology scheme than path power, technical scheme of the present invention has little, the little advantage of tangible insertion loss to the system transmissions performance impact.
Description of drawings
Fig. 1 is the 1st a kind of device composition frame chart;
Fig. 2 is the 2nd a kind of device composition frame chart;
Fig. 3 is the 3rd a kind of device composition frame chart;
Fig. 4 is the 4th a kind of device composition frame chart;
Fig. 5 is the exploded detail of beam split, opto-electronic conversion and amplifier 4 parts.
Wherein:
1-adjustable optical attenuator (VOA);
2-light preamplifier (OPA) and other function element (comprising dispersion compensation device, flat gain device, key light path performance monitoring device etc.);
3-optical add/drop multiplexer (OAD);
4-beam split, opto-electronic conversion and amplifier;
The 5-VOA driver;
6-single-chip microcomputer and data acquisition unit;
7-optical coupler, the scope of its splitting ratio are 1: 99～10: 90;
8-photodiode (PIN);
The 9-amplifying circuit amplifies and linear amplifier circuit as logarithm
Above-mentioned each parts are public external member commonly used.
Embodiment
Describe in detail below in conjunction with drawings and Examples.
1, the line hepatitis consumption self adaptation of Optical Add/Drop Multiplexer and the self-adjusting method of channel equalization
This method has following operating procedure:
A, node input optical signal;
B, each optical power monitoring parts are monitored on each the words signal, are talked about total input optical power of the luminous power and the OAD module of signal down;
C, analytically talk about the signal and the following optical power value of words signal, reject the channel of unglazed flashlight;
D, calculate average every path of going up the words channel words luminous power and average every path words luminous power down of words channel down down that light signal is arranged;
E, if last words channel is all unglazed, then setting average every path under the words luminous power is a fixed value, generally+3dBm～-get calmly between the 27dBm; Span for the difference of the maximum possible optical power value of following words channel and maximum luminous power side-play amount to the minimum possibility optical power value of words channel down and maximum luminous power side-play amount with this scope;
F, if down the words channel is all unglazed, then remove total input optical power monitor value of OAD with the input optical channel number of this node, deduct the Insertion Loss of talking path under the OAD again, income value is defined as and talks about luminous power average every path under;
G, calculating: average every path is talked about luminous power+luminous power side-play amount on words luminous power-average every path down, with the criterion of its result of calculation as adjusting VOA.
H, regulate deviation if VOA regulates criterion＞VOA, then controlling VOA increases its loss;
I, if VOA regulate criterion＜-VOA regulates deviation, then controls VOA and reduce its loss;
J, if-VOA regulates deviation＜VOA and regulates criterion＜VOA and regulate deviation, then the attenuation of VOA remains unchanged;
K, repetition B are to the process of J.
2, the line hepatitis consumption self adaptation of Optical Add/Drop Multiplexer and the self-adjusting device of channel equalization
This device has following four kinds of embodiment:
1) the 1st kind of device for a kind of light preamplifier and other function element 2 are disposed at device between adjustable optical attenuator 1 and the optical add/drop multiplexer 3, is made up of following parts as shown in Figure 1, and its annexation is:
Adjustable optical attenuator 1, light preamplifier and other function element 2, beam split, opto-electronic conversion and amplifier 4, optical add/drop multiplexer 3, beam split, opto-electronic conversion and 4 groups in amplifier, single-chip microcomputer and data acquisition unit 6, VOA driver 5, adjustable optical attenuator 1 connect to form a closed loop successively;
Adjustable optical attenuator 1, light preamplifier and other function element 2, beam split, opto-electronic conversion and amplifier 4, single-chip microcomputer and data acquisition unit 6, VOA driver 5, adjustable optical attenuator 1 connect to form another closed loop successively.
Its operation principle is: critical piece optical add/drop multiplexer 3, after it will be talked about light path down and decompose to come out from input key light path, give beam split, opto-electronic conversion and amplifier 4, carry out beam split and optical power monitoring, will talk about the luminous power of signal down and the luminous power of last words signal (or presetting luminous power) gives computing and control circuit is handled.Promote to be in the adjustable optical attenuator 1 of key light path input again, regulate the luminous power of key light path, thereby reach the effect that adapts to Line Attenuation and balanced each light path power.It mainly is applicable to the OADM joint that the leading portion Line Attenuation is bigger.
2) the 2nd kind of device for a kind of device that does not have light preamplifier and other function element 2, is made up of following parts as shown in Figure 2, and its annexation is:
Adjustable optical attenuator 1, beam split, opto-electronic conversion and amplifier 4, optical add/drop multiplexer 3, beam split, opto-electronic conversion and 4 groups in amplifier, single-chip microcomputer and data acquisition unit 6, VOA driver 5, adjustable optical attenuator 1 connect to form a closed loop successively;
Adjustable optical attenuator 1, beam split, opto-electronic conversion and amplifier 4, single-chip microcomputer and data acquisition unit 6, VOA driver 5, adjustable optical attenuator 1 connect to form another closed loop successively.
Its critical piece is identical with the 1st kind of device with operation principle, but does not dispose light preamplifier and other function element 2 in the device.It mainly is applicable to the OADM joint that the leading portion Line Attenuation is less.
3) the 3rd kind of device for a kind of light preamplifier and other function element 2 are disposed at device before the adjustable optical attenuator 1, is made up of following parts as shown in Figure 3, and its annexation is:
Behind light preamplifier and other function element 2, adjustable optical attenuator 1, beam split, opto-electronic conversion and amplifier 4, optical add/drop multiplexer 3, beam split, opto-electronic conversion and 4 groups in amplifier, single-chip microcomputer and data acquisition unit 6, VOA driver 5, adjustable optical attenuator 1 connect to form a closed loop successively;
Behind light preamplifier and other function element 2, adjustable optical attenuator 1, beam split, opto-electronic conversion and amplifier 4, single-chip microcomputer and data acquisition unit 6, VOA driver 5, adjustable optical attenuator 1 connect to form another closed loop successively.
Its critical piece is identical with the 1st kind of device with operation principle, but light preamplifier and other function element 2 in the device place before the adjustable optical attenuator.It is applicable to that mainly the leading portion Line Attenuation is bigger, and the OADM that the light light preamplifier can be unsaturated joint, can suitably improve the reception Optical Signal To Noise Ratio like this.
4) the 4th kind of device for a kind of adjustable optical attenuator 1 front and back all dispose the device of light preamplifier and other function element 2, is made up of following parts as shown in Figure 4, and its annexation is:
Behind light preamplifier and other function element 2, adjustable optical attenuator 1, light preamplifier and other function element 2, beam split, opto-electronic conversion and amplifier 4, optical add/drop multiplexer 3, beam split, opto-electronic conversion and 4 groups in amplifier, single-chip microcomputer and data acquisition unit 6, VOA driver 5, adjustable optical attenuator 1 connect to form a closed loop successively;
Behind light preamplifier and other function element 2, adjustable optical attenuator 1, light preamplifier and other function element 2, beam split, opto-electronic conversion and amplifier 4, single-chip microcomputer and data acquisition unit 6, VOA driver 5, adjustable optical attenuator 1 connect to form another closed loop successively.
Its critical piece is identical with the 1st kind of device with operation principle, but the front and back of adjustable optical attenuator 1 all dispose light preamplifier and other function element 2 in the device.It is applicable to that mainly the circuit optical attenuation is excessive and needs to install the more situation that has the assembly (as dispersion compensation device) of optical attenuation.
Claims (5)
1, a kind of line hepatitis consumption self adaptation of Optical Add/Drop Multiplexer and the self-adjusting method of channel equalization is characterized in that having following operating procedure:
A, node input optical signal;
B, each optical power monitoring parts are monitored on each the words signal, are talked about total input optical power of the luminous power and the OAD module of signal down;
C, analytically talk about the signal and the following optical power value of words signal, reject the channel of unglazed flashlight;
D, calculate average every path of going up the words channel words luminous power and average every path words luminous power down of words channel down down that light signal is arranged;
E, if last words channel is all unglazed, then setting average every path under the words luminous power is a fixed value, generally+3dBm～-get calmly between the 27dBm; Span for the difference of the maximum possible optical power value of following words channel and maximum luminous power side-play amount to the minimum possibility optical power value of words channel down and maximum luminous power side-play amount with this scope;
F, if down the words channel is all unglazed, then remove total input optical power monitor value of OAD with the input optical channel number of this node, deduct the Insertion Loss of talking path under the OAD again, income value is defined as and talks about luminous power average every path under;
G, calculating: average every path is talked about luminous power+luminous power side-play amount on words luminous power-average every path down, with the criterion of its result of calculation as adjusting VOA;
H, regulate deviation if VOA regulates criterion＞VOA, then controlling VOA increases its loss;
I, if VOA regulate criterion＜-VOA regulates deviation, then controls VOA and reduce its loss;
J, if-VOA regulates deviation＜VOA and regulates criterion＜VOA and regulate deviation, then the attenuation of VOA remains unchanged;
K, repetition B are to the process of J.
2, implement the 1st kind of device of claim 1 described method, be made up of following parts, its annexation is:
Adjustable optical attenuator (1), light preamplifier and other function element (2), beam split, opto-electronic conversion and amplifier (4), optical add/drop multiplexer (3), beam split, opto-electronic conversion and amplifier (4) group, single-chip microcomputer and data acquisition unit (6), VOA driver (5), adjustable optical attenuator (1) connect to form a closed loop successively;
Adjustable optical attenuator (1), light preamplifier and other function element (2), beam split, opto-electronic conversion and amplifier (4), single-chip microcomputer and data acquisition unit (6), VOA driver (5), adjustable optical attenuator (1) connect to form another closed loop successively.
3, implement the 2nd kind of device of claim 1 described method, be made up of following parts, its annexation is:
Adjustable optical attenuator (1), beam split, opto-electronic conversion and amplifier (4), optical add/drop multiplexer (3), beam split, opto-electronic conversion and amplifier (4) group, single-chip microcomputer and data acquisition unit (6), VOA driver (5), adjustable optical attenuator (1) connect to form a closed loop successively;
Adjustable optical attenuator (1), beam split, opto-electronic conversion and amplifier (4), single-chip microcomputer and data acquisition unit (6), VOA driver (5), adjustable optical attenuator (1) connect to form another closed loop successively.
4, the 3rd kind of device implementing claim 1 described method is made up of following parts, and its annexation is:
Behind light preamplifier and other function element (2), adjustable optical attenuator (1), beam split, opto-electronic conversion and amplifier (4), optical add/drop multiplexer (3), beam split, opto-electronic conversion and amplifier (4) group, single-chip microcomputer and data acquisition unit (6), VOA driver (5), adjustable optical attenuator (1) connect to form a closed loop successively;
Behind light preamplifier and other function element (2), adjustable optical attenuator (1), beam split, opto-electronic conversion and amplifier (4), single-chip microcomputer and data acquisition unit (6), VOA driver (5), adjustable optical attenuator (1) connect to form another closed loop successively.
5, implement the 4th kind of device of claim 1 described method, be made up of following parts, its annexation is:
Behind light preamplifier and other function element (2), adjustable optical attenuator (1), light preamplifier and other function element (2), beam split, opto-electronic conversion and amplifier (4), optical add/drop multiplexer (3), beam split, opto-electronic conversion and amplifier (4) group, single-chip microcomputer and data acquisition unit (6), VOA driver (5), adjustable optical attenuator (1) connect to form a closed loop successively;
Behind light preamplifier and other function element (2), adjustable optical attenuator (1), light preamplifier and other function element (2), beam split, opto-electronic conversion and amplifier (4), single-chip microcomputer and data acquisition unit (6), VOA driver (5), adjustable optical attenuator (1) connect to form another closed loop successively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510118978 CN100583715C (en) | 2003-08-20 | 2003-08-20 | Line attenuation adaptive and channel equalization automatic regulating method for optical division differential multiplexing equipment |
| CNB031252974A CN100492958C (en) | 2003-08-20 | 2003-08-20 | Device of line attenuation self adaption and path equilibrium automatic adjustment of light interleave multiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031252974A CN100492958C (en) | 2003-08-20 | 2003-08-20 | Device of line attenuation self adaption and path equilibrium automatic adjustment of light interleave multiplexer |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510118978 Division CN100583715C (en) | 2003-08-20 | 2003-08-20 | Line attenuation adaptive and channel equalization automatic regulating method for optical division differential multiplexing equipment |
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| Publication Number | Publication Date |
|---|---|
| CN1514564A true CN1514564A (en) | 2004-07-21 |
| CN100492958C CN100492958C (en) | 2009-05-27 |
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| CNB031252974A Expired - Fee Related CN100492958C (en) | 2003-08-20 | 2003-08-20 | Device of line attenuation self adaption and path equilibrium automatic adjustment of light interleave multiplexer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007143892A1 (en) * | 2006-06-12 | 2007-12-21 | Zte Corporation | A method for optimizing power of the oadm ring network multiplexing segment and a system thereof |
| CN101222277B (en) * | 2008-02-02 | 2012-05-30 | 烽火通信科技股份有限公司 | WSS type ROADM transmission equipment and optical channel power automatic equalization method of WSS type ROADM transmission equipment |
| CN101714901B (en) * | 2009-10-30 | 2013-03-27 | 中兴通讯股份有限公司 | Method and device for optimizing wavelength division multiplexing power |
| CN104596558A (en) * | 2015-01-16 | 2015-05-06 | 东南大学 | Self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device |
| CN105429727A (en) * | 2015-12-30 | 2016-03-23 | 桂林创研科技有限公司 | Intelligent optical add-drop multiplexer |
| CN108702234A (en) * | 2016-05-05 | 2018-10-23 | 华为技术有限公司 | Reconfigurable optical add/drop multiplexer |
-
2003
- 2003-08-20 CN CNB031252974A patent/CN100492958C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007143892A1 (en) * | 2006-06-12 | 2007-12-21 | Zte Corporation | A method for optimizing power of the oadm ring network multiplexing segment and a system thereof |
| CN101222277B (en) * | 2008-02-02 | 2012-05-30 | 烽火通信科技股份有限公司 | WSS type ROADM transmission equipment and optical channel power automatic equalization method of WSS type ROADM transmission equipment |
| CN101714901B (en) * | 2009-10-30 | 2013-03-27 | 中兴通讯股份有限公司 | Method and device for optimizing wavelength division multiplexing power |
| CN104596558A (en) * | 2015-01-16 | 2015-05-06 | 东南大学 | Self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device |
| CN104596558B (en) * | 2015-01-16 | 2017-03-08 | 东南大学 | Adaptive gain balanced type distributing optical fiber sensing optical signal method of reseptance and device |
| CN105429727A (en) * | 2015-12-30 | 2016-03-23 | 桂林创研科技有限公司 | Intelligent optical add-drop multiplexer |
| CN105429727B (en) * | 2015-12-30 | 2017-12-01 | 桂林创研科技有限公司 | A kind of intelligent optical add/drop multiplexer |
| CN108702234A (en) * | 2016-05-05 | 2018-10-23 | 华为技术有限公司 | Reconfigurable optical add/drop multiplexer |
| CN108702234B (en) * | 2016-05-05 | 2019-12-06 | 华为技术有限公司 | Reconfigurable optical add-drop multiplexer |
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| Publication number | Publication date |
|---|---|
| CN100492958C (en) | 2009-05-27 |
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