CN1126310C - Interoffice channel signal transmission unit in wave division multiplex system - Google Patents
Interoffice channel signal transmission unit in wave division multiplex system Download PDFInfo
- Publication number
- CN1126310C CN1126310C CN99126748A CN99126748A CN1126310C CN 1126310 C CN1126310 C CN 1126310C CN 99126748 A CN99126748 A CN 99126748A CN 99126748 A CN99126748 A CN 99126748A CN 1126310 C CN1126310 C CN 1126310C
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- Prior art keywords
- signal
- interoffice
- light
- data
- transmission
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0209—Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
- H04B10/672—Optical arrangements in the receiver for controlling the input optical signal for controlling the power of the input optical signal
- H04B10/673—Optical arrangements in the receiver for controlling the input optical signal for controlling the power of the input optical signal using an optical preamplifier
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/07—Monitoring an optical transmission system using a supervisory signal
- H04B2210/072—Monitoring an optical transmission system using a supervisory signal using an overhead signal
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
The invention relates to an interoffice transmission unit in wave division multiplex WDM system, the interoffice transmission unit is used for transmitting the signal for wave division multiplexing between interoffice with out needing single regenerative relaying. The interoffice transmission unit includes: light receiving module for receiving channel signal and transmitting the same to low-level system which requires interoffice transmission for the divided channel signals, and converting the received channel signal into electrical signal and extracting data and clock signal form the electrical signal; light transmission module for connecting light receiving module and light transmission line connected to the low-level system requiring interoffice transmission, and converting the extracted data into light signal and then transmitting the same to the low-level system.
Description
The present invention is that No.98-60760, title require priority for the application of " interoffice channel signal transmission unit in the wavelength-division multiplex system " to the sequence number of submitting at korean industrial property office on December 30th, 1998, and the content of this application is comprised in here for your guidance.
Present invention generally relates to a WDM (wavelength division multiplexing) system, relate more specifically to be used for transmitting the equipment of a wavelength-division demultiplexed channel signal at interoffice.
The WDM transmission is a kind of scheme of optical signal transmission, and numerous wavelength optical signals are transmitted by an optical fiber in this scheme.In the WDM transmission plan, express multiplexing numerous wavelength optical signals on the optical fiber with the term wavelength division multiplexing, its inverse operation is called as the wavelength-division demultiplexing.
WDM technology is to improve the simplest method of transmission capacity in the optical communication system.Wdm system carried out wavelength division multiplexing to a plurality of channel datas before transmission, the data of receiving are carried out reallocating to lower-level system behind the wavelength-division demultiplexing.Transmission ends gives pre-set Wavelength Assignment from the signal of certain wavelength of lower-level system reception, makes resulting signal multiplexing become 20/40/80Gbps or the higher signal of speed.Then, receiving terminal receives the very high signal of speed that transmits through multistage image intensifer and optical transmission line, is a plurality of channels by Wave decomposing multiplexer with the signal decomposition of receiving, and with each the separated channels signal pass to the purpose lower-level system.The wavelength of WDM is defined by ITUT (international telecommunication union telecommunication's standard group).Wavelength division multiplexing realizes that by adopting optical coupler and AWG (array waveguide grating) Wave decomposing multiplexer is realized by adopting AWG and FBG (Fiber Bragg Grating FBG).EDFA (erbium-dropedfiber amplifier) is as image intensifer, and lower-level system is the transmission equipment of the SDH that is similar to 2.5Gbps (synchronous digital classification) equipment of a low speed.
As mentioned above, the channel signal that receiving terminal is separated Wave decomposing multiplexer directly is sent to lower-level system, and need not the intervention of independent reclaim equiment.The receiving terminal of this quasi-representative as shown in Figure 1 in the wdm system.In Fig. 1, Wave decomposing multiplexer 100 will demultiplex into the light signal of different channels from the wdm optical signal that WDM optical transmission line 102 receives, and send the channel signal that each has separated among the lower-level system S1-Sn corresponding target lower-level system.Here, the number of channel for example is n.
Output is so different on each channel through the light signal behind the demultiplexing, is again so faint on power, to such an extent as to the transmission at an intra-office light signal all has been subjected to limitation in above-mentioned structure.Because the gain characteristic of EDFA is different on each channel, the signal output of Wave decomposing multiplexer 100 just dissimilates after by multistage EDFA, to such an extent as to its signal power is can not allow it to transmit at interoffice so for a short time.Though channel signal may be sent to the lower-level system of the intra-office of lower-level system S1 in the Sn.But the relaying of interoffice transmission just should be provided.
Owing to when WDM equipment is installed, should use many trunkings as the interoffice transmission is needed, thereby reduce the effectiveness of WDM equipment significantly.
In addition, system should be each channel the detector that can detect mistake from each channel signal is provided.The result is in actual conditions too much detector to be installed respectively.
Therefore, one object of the present invention just provides an interoffice transmission unit, and this unit can need not channel signal after independent regenerative repeating just can transmit the wavelength-division demultiplexing at interoffice.
Another object of the present invention provides an interoffice transmission unit, and this unit need not the mistake that independent regeneration measuring instrument just can detect channel signal behind the wavelength-division demultiplexing.
Above-mentioned purpose can realize by an interoffice transmission unit is provided in wdm system.This interoffice transmission unit comprises Optical Receivers and light delivery module.Optical Receivers receive channel signal, the destination that this channel signal will be sent to is the interoffice transmission is carried out in a requirement to each channel signal by the Wave decomposing multiplexer demultiplexing a lower-level system, this Optical Receivers also is converted to the signal of telecommunication with the channel signal that receives, and extracts data from the signal of telecommunication.Light delivery module is used to connect Optical Receivers and optical transmission line, and this optical transmission line is coupled to the lower-level system that requires to carry out the interoffice transmission, and this light delivery module also becomes light signal with the data transaction of being extracted, and with optical signal transmission to lower-level system.
From detailed description below in conjunction with accompanying drawing, about above-mentioned and other purpose, function and characteristics of the present invention will become clearer and more definite, in these accompanying drawings,
Fig. 1 is the block diagram of typical wdm system receiving terminal;
Fig. 2 is the block diagram that has the receiving terminal of interoffice transmission unit according to embodiments of the invention in wdm system;
Fig. 3 is the detailed diagram of the interoffice transmission unit 104 shown in Fig. 2.
More completely describe preferred embodiment of the present invention below referring now to accompanying drawing, in the following description, well-known function or structure will be not described in detail, because the indigestion that unnecessary details will make the present invention become.
Fig. 2 is the block diagram that has the receiving terminal of interoffice transmission unit according to an embodiment of the invention in the wdm system, and receiving terminal comprises the interoffice transmission unit 104 that the interoffice channel transmitted is carried out in requirement that is used for except that the parts of Fig. 1.Here suppose that channel 2 needs the interoffice transmission.Interoffice transmission unit 104 can be provided with for arbitrary interoffice channel transmitted that needs.
Fig. 3 is the detailed diagram of the interoffice transmission unit 104 shown in Fig. 2.Interoffice transmission unit 104 is made up of Optical Receivers 200, optical transmission module 208, demodulation multiplexer 218 and SOHP (section overhead processor) 220.
In Fig. 3, Optical Receivers 200 comprises a PIN-PD (positive-intrinsic-negative-optical diode) 202, LA (limiting amplifier) 204 and ce circuit (clock and data recovery) circuit 206.Optical Receivers 200 receive channel signals, this channel signal need carry out the interoffice transmission, and sending first floor system S2 to those channel signals of crossing through Wave decomposing multiplexer 100 demultiplexings, Optical Receivers 200 also is converted to the signal of telecommunication with the channel signal that receives and extracts data and clock signal from the signal of telecommunication.PIN-PD202 is the light checkout equipment, is used for converting the signal of telecommunication to from the channel signal sensed light signal that receives and with light signal, and LA204 has the effect of amplitude limit amplification signal, and ce circuit 206 extracts data and clock signal from amplifying signal.
If lower-level system is in a certain office, each all directly links the input of corresponding target lower-level system from the output of the light signal of Wave decomposing multiplexer 100 outputs.One needs interoffice channel transmitted signal to be added on the frame that comprises the interoffice transmission unit, is added to interoffice transmission unit 104 then, specifically on the Optical Receivers 200.Because the light signal output behind the initial demultiplexing is lower than-15dbm, Optical Receivers 200 requires to carry out interoffice channel transmitted signal by using PIN-PD202 just can receive.This is fully possible, because the output of light signal amplified by EDFA at the front end of Wave decomposing multiplexer 100, and then is added to the input of Wave decomposing multiplexer 100.PIN-PD202 converts the light signal that receives to the signal of telecommunication, no matter the amplitude of LA204 input signal and the signal of telecommunication is zoomed into constant output, ce circuit 206 is extracted into right electric data and clock signal with smooth waveform usually.
One in the paired data signal was added to light delivery module 208 and handles before transmitting by optical transmission line 106.Light delivery module 208 is connected Optical Receivers 200 and directly links between the interoffice optical transmission line 106 of the lower-level system S2 that requires to carry out the interoffice transmission, and this module comprises LD (laser diode) driver 210, LD212, ATC (automatic temperature-adjusting control) circuit 214 and APC (automated power control) circuit 216.Light delivery module 208 will become by the data transaction that ce circuit 206 is extracted light signal and with this optical signal transmission to lower-level system S2.It is the light signal that transmits the destination that LD212 is subjected to LD driver 210 to drive and produce with interoffice optical transmission line 106.The data-driven LD212 that LD driver 210 extracts according to ce circuit 206 is so that directly be modulated to data on the light signal.ATC circuit 214 is adopted at this owing to the temperature variant characteristic of LD212, and APC circuit 216 keeps the light signal of LD212 output to be in constant level.Transmission range is by the technical indicator decision of LD212.In patent application of the present invention, the LD of 1310nm is used for 15km to 40km, and the LD of 1550nm is used for 60km even longer.Therefore, can channel signal be transmitted larger distance by the LD212 that selects desired specification.
Another data and the paired clock signal extracted by ce circuit 206 are applied to demodulation multiplexer 218 to be used for error detection.Demodulation multiplexer 218 carries out demultiplexing with the data that ce circuit 206 transmits, and makes it to become the low speed data that is easy to handle in SOHP220.For example, the data that transmitted by ce circuit 206 are 2.5Gbps, and SOHP220 can only handle the data of 51Mbps, so just can be by demultiplexing chip of 1: 16 of chip cascade of 1: 3 demultiplexing being demultiplexed into the data of 2.5Gbps the data of 48～51Mbps.The ASIC (ASIC(Application Specific Integrated Circuit)) that SOHP220 uses the error detection be exclusively used in the test of light data performance to use.Therefore, just providing a kind of in the prior art can carry out the detector that the channel error detection is used to each channel, yet interoffice transmission unit 104 can substitute the error detection instrument in the present invention.
As mentioned above, the Optical Receivers 200 in the interoffice transmission unit 104 receives by Wave decomposing multiplexer 100 separated channels signals, and converts optical channel signal to the signal of telecommunication.Data after the part conversion are used for error detection, and another part is applied to the input of light delivery module 208 so that be sent to another end office (EO).This that is to say, an input that is applied to light delivery module 208 in a pair of data of Optical Receivers 200 outputs, and its another electrical signal data is connected to SOHP220 to be used for detecting mistake from light signal in a general way by demodulation multiplexer 218.Therefore, only need to insert single interoffice transmission unit 104 simply and just can find mistake in each received signal, and need not place measuring instrument respectively by all WDM transmission lines.Because mistake usually by software processes and be presented on the GUI (graphical user interface), therefore we can say that interoffice transmission unit 104 can substitute measuring instrument.Use a plurality of interoffice transmission units 104 can detect mistake on each channel simultaneously.
Yet, data are handled in Wave decomposing multiplexer and be need not to use the other equipment in traditional wdm system then and directly reach lower-level system, provide the frame that interoffice transmission unit 104 is installed just to provide a kind of selection for the interoffice transmission in practical application of the present invention separately.Interoffice transmission unit 104 on function similar in appearance to typical Channel Elements shown in Figure 3.Therefore, by revising the shape of transport module simply, just can make Channel Elements compatible mutually with interoffice transmission unit 104.Can set the function of a unit according to module.Because interoffice transmission unit 104 is closely similar with typical Channel Elements on function, and use internal module and the member identical with Channel Elements, its size Channel Elements size of the present invention that coexists is identical.Relatively cheap general receiver is used as Optical Receivers 200, and light delivery module 208 is applicable to interoffice transmission unit 104 by being manufactured on traditional light delivery module structure.
Use interoffice transmission unit 104 to carry out the interoffice transmission and to make transmission range be increased to needed scope to channel signal, yet in the prior art, as the Wave decomposing multiplexer 100 of receiving terminal in the wdm system, it is impossible will carrying out the interoffice transmission according to its power output.Because single interoffice transmission unit 104 has overcome the needs of independent regenerative transmission, so individual system is enough.The required too much measuring instrument of whole channels that the error detection function of interoffice transmission unit 104 allows interoffice transmission unit 104 can replace in the prior art.Correspondingly also can side by side be a plurality of channel execution performance tests, thereby increase the autgmentability and the economic validity of system and network.
Because the present invention has obtained showing and describing in specific preferred embodiment, what it should be appreciated by those skilled in the art is that the spirit and scope of the present invention can also comprise plurality of kinds of contents and pro forma variation, only be an examples of applications for example, and can be omitted by interoffice transmission unit 104 performed error detection occurs functions.In this case, demodulation multiplexer 218 and SOHP220 are exactly unnecessary in interoffice transmission unit 104.Therefore, scope of the present invention is following claim defined.
Claims (2)
- The interoffice transmission unit in (1.WDM wavelength division multiplexing) system, this system has Wave decomposing multiplexer, be used for demultiplexing into the light signal of different channels by the wdm optical signal that the WDM optical transmission line receives, and with each the separated channels signal be transferred to the target lower-level system, comprising:Optical Receivers, being used to receive its transmission destination is the channel signal of lower-level system, lower-level system requires the separated channels signal is carried out the interoffice transmission, and the channel signal that Optical Receivers also is used for receiving converts the signal of telecommunication to, and extracts data and clock signal from the signal of telecommunication.Light delivery module is used to connect Optical Receivers and interoffice optical transmission line, and this interoffice optical transmission line is coupled to the lower-level system that requires the interoffice transmission, and this light delivery module becomes light signal with the data transaction of extracting, and light signal is reached lower-level system.A demodulation multiplexer, be used for the data that will extract and clock signal demultiplex into low speed data andA section overhead processor (SOHP) is used for detecting mistake from the data of demultiplexing.
- 2. according to the interoffice transmission equipment of claim 1, it is characterized in that Optical Receivers comprises;Light-emitting device is used to detect the light from paid-in channel signal to the signal of telecommunication,Limiting amplifier is used to amplify the signal of telecommunication that transmits from the light checkout equipment, limits the amplitude of the signal of telecommunication simultaneously,The clock and data recovery circuit is used for extracting data and clock signal from the signal of limiting amplifier output.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR60760/1998 | 1998-12-30 | ||
| KR1019980060760A KR100330808B1 (en) | 1998-12-30 | 1998-12-30 | Channel signal station transmission unit in wavelength division multiplexing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1258970A CN1258970A (en) | 2000-07-05 |
| CN1126310C true CN1126310C (en) | 2003-10-29 |
Family
ID=19567524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99126748A Expired - Fee Related CN1126310C (en) | 1998-12-30 | 1999-12-10 | Interoffice channel signal transmission unit in wave division multiplex system |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100330808B1 (en) |
| CN (1) | CN1126310C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100445910B1 (en) * | 2001-12-27 | 2004-08-25 | 한국전자통신연구원 | Optical signal receiving apparatus and method having suitable receiving performance in spite of change of intensity of the optical signal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5710648A (en) * | 1995-12-29 | 1998-01-20 | Lucent Technologies Inc. | Optical communication system and remote sensor interrogation |
-
1998
- 1998-12-30 KR KR1019980060760A patent/KR100330808B1/en not_active IP Right Cessation
-
1999
- 1999-12-10 CN CN99126748A patent/CN1126310C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1258970A (en) | 2000-07-05 |
| KR20000044269A (en) | 2000-07-15 |
| KR100330808B1 (en) | 2002-08-21 |
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