CN1567803A - A device for implementing OADM - Google Patents
A device for implementing OADM Download PDFInfo
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- CN1567803A CN1567803A CNA031318932A CN03131893A CN1567803A CN 1567803 A CN1567803 A CN 1567803A CN A031318932 A CNA031318932 A CN A031318932A CN 03131893 A CN03131893 A CN 03131893A CN 1567803 A CN1567803 A CN 1567803A
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Abstract
The invention discloses a device of realizing optical apart-division multiplex, relating to an optical apart-division multiplex (OADM) device in optical communication field and especially relating to the field of realizing top and bottom channels of optical wavelength service and its protection in high speed optical transmission network and its protective field, providing a low-cost optical apart-division device of realizing apart-division multiplex as waves are relatively many and having higher flexibility and it replaces traditional optical cross unit with electric cross unit. It is mainly applied to the occasion of realizing the top and bottom channel and multiple service of website service of each WDM device.
Description
Technical field
The present invention relates to Optical Add Drop Multiplexer (OADM) equipment in the optical communication field, relate in particular to the optical wavelength business that realizes in the high-speed light transmission network road and protection field thereof up and down.
Background technology
Divide multiplex technique (WDM) be adopt light close ripple/minute wave technology, synthetic one road light signal of the optical carrier of different wave length is transmitted on an optical fiber, thereby reaches a kind of Fibre Optical Communication Technology that makes full use of bandwidth of an optical fiber.Dense wave division multipurpose (DWDM) technology has become the main mode of fiber communication link at present, Optical Add/Drop Multiplexer can be realized professional road up and down in each WDM equipment sites flexibly, thereby make wdm system be more suitable for the development of metropolitan area network, simultaneously networking mode also gradually from point to points the simple networking of link develop into complicated looped network.Use the OADM equipment network, can make up various optical channels or multiplex section protective ring, as shown in Figure 1.
The major function that the OADM system need finish has:
1. the optical channel wavelength assignment merit of setting out on a journey, following road optical channel port assignment function.This has reflected the OADM network more flexible.
2. realize multiplex section and path protection switch function, support various self-healing functions.
3. multi-service inserts.
Traditional OADM system adopts pure optical device to finish Core Feature, adopts array of photoswitch to finish cross-coupled function concretely, adopts Optical Equalizer spare to finish light power equalization simultaneously.Fig. 2 is traditional OADM device structure block diagram, represents that a folk prescription is to OADM equipment.The professional light in line side enters optical demultiplexer (ODU), the Optical Demultiplexing device is exported the business of different wave length by the mouth of not sharing the same light, the wavelength that need carry out the routing intersection enters the light cross unit, the business on road under this website needs (not needing to carry out simultaneously the port assignment) does not enter the light cross unit, directly descends road (shown in DROP1 among the figure); The business that port need be set of setting out on a journey in this locality also inserts light cross unit (shown in ADD2 among the figure).In the light cross unit, finish port assignment function, send (shown in DROP2 among the figure) after the business that needs to carry out the port assignment in the business of following road is handled by the light cross unit.The business that setting out on a journey in this locality does not need to change port is connected to optical multiplexer (shown in ADD1 among the figure) through behind the light power equalization.All light signals that need transmit all pass through synthetic one road light signal of optical multiplexer (OMU) to be transmitted.
U.S. Patent number 6,507,682, patent name: optical switch, U.S. Patent number: 6,504,963, patent name: Optical fiber protection switch, and Chinese patent application number: 01132239.X title: a kind of complete non-blocked wave division multiple address cross connecting apparatus, disclose the unit of several realization Optical Add Drop Multiplexer respectively, these units and previously described system exist following shortcoming:
1. adopt a large amount of pure optical devices (optical switch and adjustable optical attenuator), the equipment cost height.
2. light shutter device port way is less, when wave number more for a long time, be difficult for to realize when complexity is high.
3. owing to adopt pure optical device, professional intersection particle must be based on wavelength, and flexibility is relatively poor.
4. still need a large amount of photoelectricity light conversion (O/E/O) equipment when if desired the wavelength of business being changed, simultaneously this website up and down the service wavelength on road need one-to-one relationship, can not realize application such as broadcasting flexibly.
Summary of the invention
For overcoming the deficiencies in the prior art, a kind of low cost is provided, can realize wave number add drop multiplex more for a long time, and the device with Optical Add Drop Multiplexer of higher flexibility, the technical solution used in the present invention is:
A kind of device of Optical Add Drop Multiplexer of realizing comprises Optical Demultiplexing device and optical multiplexer spare, also comprise photoelectric conversion units, electric cross unit, electro-optical conversion unit, each wavelength service signal through the Optical Demultiplexing device obtains need intersect, the business of port assignment or wavelength conversion becomes the signal of telecommunication by photoelectric conversion units and enter electric cross unit; Do not intersect, the professional directly road down of the following road wavelength of port assignment and wavelength conversion; Set out on a journey at this website need to intersect, the business of port assignment or wavelength conversion enters electric cross unit after also by photoelectric conversion units, finishes in electric cross unit that professional intersection reorganization, port are specified, the road is provided with down; The business that need descend the road through the port assignment after the electric cross unit output through road down behind the electro-optical conversion unit; The business that needs transmission is transferred to next node then by closing ripple in the laggard light inlet multiplexing device of electrooptic switching element, and this website need be set out on a journey does not need the business of port assignment directly to be linked into optical multiplexer spare.
Wherein, the interface of described electrooptic switching element employing is dynamically adjusted optical wavelength and luminous power; Road wavelength business is by road under the directly modulated lasers under in the described electrooptic switching element.
Have, some described OADM apparatus can adopt the channel interleaving mode to link to each other again; Perhaps, some ports by public cross unit link to each other between two described electric cross units.
The present invention has compared following advantage with traditional technical scheme:
1) along with the raising of ASIC technology and designing technique, the electricity intersection device cost of big capacity, multichannel number sharply descends, and adopts electricity intersection device instead of pure optics can reduce equipment manufacturers' cost.
2) photoelectricity light convert light module is because the market consumption is big, standard is unified, technical maturity, and the price and the performance of device all are expected.
3) adopt electricity intersect device be the OADM equipment of core with compare based on the equipment of pure optical device have powerful, characteristics such as business configuration is flexible.
4) signal demand of electric cross unit is through the electric light conversion, can realize each output port light power equalization by the electric light conversion, save a large amount of light adjustable attenuators, reduce equipment cost and equipment complexity, electro optical interface can be realized the adjustment of optical wavelength simultaneously.
5) equipment has stronger expansion upgrading ability.
6) the various protections of adopting the OADM equipment that intersects based on electricity can the finish optical ring network function of switching.
7) need descend the business on road (not carrying out the transmission of WDM circuit) to adopt directly modulated lasers by electric cross unit, can reduce equipment cost at this website.
Description of drawings
Fig. 1 is an OADM loop network structure
Fig. 2 is traditional OADM device structure block diagram
Fig. 3 is the OADM device structure block diagram that adopts electricity intersection device
Fig. 4 is a laser wavelength control principle block diagram
Fig. 5 is a laser power control principle block diagram
Fig. 6 adopts the channel interleaving device to finish the upgrading of OADM equipment
Fig. 7 is the mutual electricity intersection OADM equipment schematic diagram of shared port
Embodiment
Further specify the present invention below in conjunction with drawings and Examples.
The present invention adopts present various technical maturity, and the photoelectric device that cost performance is high is realized the miscellaneous service function of OADM system.Core Feature adopts electricity intersection device at a high speed to realize.
Fig. 3 is the OADM device structure block diagram that adopts electricity intersection device.As shown in Figure 3: the circuit light signal obtains the service signal of each wavelength through Optical Demultiplexing device ODU along separate routes, need intersect, the business of port assignment or wavelength conversion becomes the signal of telecommunication by light-to-current inversion and enter electric cross unit; Do not intersect, the professional directly road (shown in DROP1 among the figure) down of the following road wavelength of port assignment and wavelength conversion.Set out on a journey at this website need to intersect, the business of port assignment or wavelength conversion enters electric cross unit (shown in ADD2 among the figure) after also by light-to-current inversion.In electric cross unit, finish functions such as professional intersection reorganization, port are specified, following road is provided with.The business that need descend the road through the port assignment after electric cross unit output through road (shown in DROP2 the figure) down behind the electro-optical conversion.The business that need transmit is all changed among the laggard light inlet multiplexing device OMU by electric light and is closed ripple, is transferred to next node then.This website need be set out on a journey does not need the business of port assignment directly to be linked into optical multiplexer spare OMU (shown in ADD1 among the figure).
Do not need the business of port assignment (as ADD1 among Fig. 3) to adjust luminous power if desired if this website need be set out on a journey, can realize adjusting by increasing light adjustable attenuator (can adopt automatically controlled optical attenuator VOA).
Be very outstanding of flexibility the OADM equipment of core for adopting electricity to intersect.Because the complexity of raising chip and the speed of service are along with the improvement of semiconductor technology, the development of design software have not been very difficult; The electricity cross unit can provide the interleaving function of all size particle business, realize service broadcast, the data-signal shaping is (such as the clock and data recovery shaping, the signal preemphasis, signal equalization etc.), the function of error correcting code (such as forward error correction), these functions can adopt digital circuit logic to realize, the signal to noise ratio of circuit can be required reduce 6dB such as the situation that adopts RS (REED-SOLOMON coding) to do forward error correction, adopt signal preemphasis and equilibrium can make high speed signal realize long line driving force, these functions adopt the traditional optical device to realize.Along with the raising of the complexity of optical-fiber network, such equipment can be exhibited one's skill to the full in the access side of backbone network, metropolitan area network.
Adopt the electricity intersection to have stronger configurable ability for the OADM equipment of core; can realize various configuration features by the network management software, as the power adjustment of each output port, can be at any time for the intersection of each port traffic realize configuration, support the linear speed of each wavelength business to intersect, various protection is switched etc.These functions are needs of intelligent optical-fiber network, adopt pure optical device can't realize these application.
Legacy network adopts optical attenuator to realize the equilibrium of power, adopts electricity to intersect and realizes dynamic wavelength adjustment for the OADM equipment of core can adopt the means of software, functions such as power adjustment.See shown in Figure 4 for the concrete method of the control of wavelength.Constitute laser temperature control negative-feedback circuit by laser refrigerator unit, negative tempperature coefficient thermistor, feedback amplifier, DA circuit and CPU control unit.Temperature control basic principle is as shown below, and when temperature is higher than set point, the thermistor resistance reduces, and A point current potential descends, and amplifies by negative feedback, and B point current potential is raise, and the increase of refrigerator electric current positive makes the laser temperature reduction.When temperature is lower than set point, the course of work is opposite.Reference level by regulator potentiometer or CPU control DA can make feedback circuit be operated in different balance points, thereby laser temperature is changed and then changes laser wavelength.Fig. 5 is a laser power control principle block diagram.By certain splitting ratio detection laser luminous power, become voltage by detection diode backlight thereby will detect current conversion by transreactance amplifier.The voltage of conversion is kept constant as negative feedback parameter control laser bias current after amplifier amplifies, thereby reach the purpose of constant laser Output optical power, can pass through AD, DA, cpu circuit detects and controls for laser control voltage.All control units all pass through unified IIC control bus to be realized.
Fig. 6 adopts the channel interleaving device to finish the upgrading of OADM equipment.Multiplex section signal that frequency interleaves mutually through the channel interleaving device multiplexingly make that the number of channel doubles, channel spacing is original 1/2; Carry out reverse process at receiving terminal.The advantage of making is to carry out the System Expansion upgrading under the situation that keeps original investment like this.
Adopt the OADM equipment of electricity intersection device in protection very strong advantage to be arranged, can be convenient, flexible be provided with realizes various resist technologies.
Adopt the resist technology of channel switching, do not need turning protocol, only need to make corresponding passage by criterion and switch, realize professional switching in this website inside, like this work to switch speed ratio very fast.When adopting two fine duplex channel share protect, node can be shared m wavelength as channel layer protection (being the m:n protection), and also shared this wavelength of each node carries out path protection on the ring.Adopt shared portion wavelength two fine duplex channel layer protection rings just to reduce local paths up and down and need not to increase extra cost as the usefulness of protection.
If the employing multiplex section protection is then protected according to concrete agreement,, website protect the message of switching to make corresponding passage hand-off process when receiving.
The OADM device structure of employing electricity intersection device both can adopt single big capacity intersection ply-yarn drill to realize, also can adopt low capacity intersection ply-yarn drill to realize.When adopting low capacity to intersect, can connect some ports realization reciprocations of public cross unit by backboard.Fig. 7 is the mutual electricity intersection OADM equipment schematic diagram of shared port; the different intersection realized various mutual functions by some ports of public cross unit between the ply-yarn drill in devices illustrated; these interactive functions both can be used for protection and switch; also can be used for data cross processing etc., when the initial stage output investment ratio can be adopted in such a way more after a little while.
As can be seen, the OADM equipment of realizing in the mode that adopts electricity to intersect has than light interleaved mode more performance, the flexibility of its height makes optical-fiber network have stronger intellectuality, meet the development trend of ASON from now on, it is strong that such equipment also has survival ability simultaneously, safeguard simply high performance-price ratio, characteristics such as intellectuality.
Claims (5)
1. a device of realizing Optical Add Drop Multiplexer comprises Optical Demultiplexing device and optical multiplexer spare, it is characterized in that, also comprise photoelectric conversion units, electric cross unit, electro-optical conversion unit, each wavelength service signal through the Optical Demultiplexing device obtains need intersect, the business of port assignment or wavelength conversion becomes the signal of telecommunication by photoelectric conversion units and enter electric cross unit; Do not intersect, the professional directly road down of the following road wavelength of port assignment and wavelength conversion; Set out on a journey at this website need to intersect, the business of port assignment or wavelength conversion enters electric cross unit after also by photoelectric conversion units, finishes in electric cross unit that professional intersection reorganization, port are specified, the road is provided with down; The business that need descend the road through the port assignment after the electric cross unit output through road down behind the electro-optical conversion unit; The business that needs transmission is transferred to next node then by closing ripple in the laggard light inlet multiplexing device of electrooptic switching element, and this website need be set out on a journey does not need the business of port assignment directly to be linked into optical multiplexer spare.
2. a kind of device of realizing Optical Add Drop Multiplexer according to claim 1 is characterized in that, the interface that described electrooptic switching element adopts is dynamically adjusted optical wavelength and luminous power.
3. a kind of device of realizing Optical Add Drop Multiplexer according to claim 1 is characterized in that, following road wavelength business is by road under the directly modulated lasers in the described electrooptic switching element.
4. a kind of device of realizing Optical Add Drop Multiplexer according to claim 1 is characterized in that, some described OADM apparatus adopt the channel interleaving mode to link to each other.
5. a kind of device of realizing Optical Add Drop Multiplexer according to claim 1 is characterized in that, and is continuous by some ports of public cross unit between two described electric cross units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031318932A CN1567803A (en) | 2003-06-11 | 2003-06-11 | A device for implementing OADM |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA031318932A CN1567803A (en) | 2003-06-11 | 2003-06-11 | A device for implementing OADM |
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| CN1567803A true CN1567803A (en) | 2005-01-19 |
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Cited By (7)
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| WO2008113266A1 (en) * | 2007-03-16 | 2008-09-25 | Huawei Technologies Co., Ltd. | A scheduling equipment and a scheduling method in optical communication network |
| CN100442761C (en) * | 2005-03-09 | 2008-12-10 | 华为技术有限公司 | Transmission method and process device of Ethernet service signal in wave division duplex network |
| CN101997615A (en) * | 2010-07-19 | 2011-03-30 | 深圳华拓旺科技有限公司 | 20G optical transceiver and packaging method thereof |
| CN103384972A (en) * | 2012-12-17 | 2013-11-06 | 华为技术有限公司 | Signalling establishment method at the moment of placing electric relay in electric network elements, optical network elements and electric network elements |
| RU2615498C2 (en) * | 2010-01-08 | 2017-04-05 | Сан Пэтент Траст | Ofdm transmitter, ofdm transmission method, ofdm receiver and ofdm reception method |
| CN107819522A (en) * | 2016-09-14 | 2018-03-20 | 中国电信股份有限公司 | ROADM equipment, optical network system and transmission method |
| CN109905196A (en) * | 2015-01-27 | 2019-06-18 | 日本电气株式会社 | Add/Drop Multiplexer |
-
2003
- 2003-06-11 CN CNA031318932A patent/CN1567803A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442761C (en) * | 2005-03-09 | 2008-12-10 | 华为技术有限公司 | Transmission method and process device of Ethernet service signal in wave division duplex network |
| US8340516B2 (en) | 2007-03-16 | 2012-12-25 | Huawei Technologies Co., Ltd. | Grooming method and apparatus for optical communication network |
| WO2008113266A1 (en) * | 2007-03-16 | 2008-09-25 | Huawei Technologies Co., Ltd. | A scheduling equipment and a scheduling method in optical communication network |
| US10547483B2 (en) | 2010-01-08 | 2020-01-28 | Sun Patent Trust | OFDM transmitter device having a symbol generator for generating non-zero control symbols, and OFDM transmission method including generating non-zero control symbols |
| US10931494B2 (en) | 2010-01-08 | 2021-02-23 | Sun Patent Trust | OFDM transmitter device having a symbol generator for generating non-zero control symbols, and OFDM transmission method including generating non-zero control symbols |
| US11968071B2 (en) | 2010-01-08 | 2024-04-23 | Sun Patent Trust | OFDM transmitter device having a symbol generator for generating non-zero control symbols, and OFDM transmission method including generating non-zero control symbols |
| US11621879B2 (en) | 2010-01-08 | 2023-04-04 | Sun Patent Trust | OFDM transmitter device having a symbol generator for generating non-zero control symbols, and OFDM transmission method including generating non-zero control symbols |
| US11283662B2 (en) | 2010-01-08 | 2022-03-22 | Sun Patent Trust | OFDM transmitter device having a symbol generator for generating non-zero control symbols, and OFDM transmission method including generating non-zero control symbols |
| RU2615498C2 (en) * | 2010-01-08 | 2017-04-05 | Сан Пэтент Траст | Ofdm transmitter, ofdm transmission method, ofdm receiver and ofdm reception method |
| US10218554B2 (en) | 2010-01-08 | 2019-02-26 | Sun Patent Trust | OFDM transmitter device having a symbol generator for generating non-zero control symbols, and OFDM transmission method including generating non-zero control symbols |
| CN101997615A (en) * | 2010-07-19 | 2011-03-30 | 深圳华拓旺科技有限公司 | 20G optical transceiver and packaging method thereof |
| CN103384972A (en) * | 2012-12-17 | 2013-11-06 | 华为技术有限公司 | Signalling establishment method at the moment of placing electric relay in electric network elements, optical network elements and electric network elements |
| RU2606397C1 (en) * | 2012-12-17 | 2017-01-10 | Хуавей Текнолоджиз Ко., Лтд. | Method of signalling establishing when electric regenerator is located on electric network element, optical network element and electric network element |
| CN103384972B (en) * | 2012-12-17 | 2016-11-16 | 华为技术有限公司 | A method for establishing electrical relay signaling in grid elements, optical network elements, and grid elements |
| WO2014094209A1 (en) * | 2012-12-17 | 2014-06-26 | 华为技术有限公司 | Optical network element, electric network element and signaling establishment method when electric relay is in electric network element |
| CN109905196A (en) * | 2015-01-27 | 2019-06-18 | 日本电气株式会社 | Add/Drop Multiplexer |
| US11431431B2 (en) | 2015-01-27 | 2022-08-30 | Nec Corporation | Add/drop multiplexer, network system, transmission method, non-transitory computer readable medium, and management device |
| CN107819522A (en) * | 2016-09-14 | 2018-03-20 | 中国电信股份有限公司 | ROADM equipment, optical network system and transmission method |
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