CN1787409A - Passive optical network system and method of transmitting broadcasting signal in same - Google Patents
Passive optical network system and method of transmitting broadcasting signal in same Download PDFInfo
- Publication number
- CN1787409A CN1787409A CNA2005101270653A CN200510127065A CN1787409A CN 1787409 A CN1787409 A CN 1787409A CN A2005101270653 A CNA2005101270653 A CN A2005101270653A CN 200510127065 A CN200510127065 A CN 200510127065A CN 1787409 A CN1787409 A CN 1787409A
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- China
- Prior art keywords
- optical signal
- broadcast singal
- downstream data
- multiplexed
- data optical
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
- H04Q2011/0007—Construction
- H04Q2011/0016—Construction using wavelength multiplexing or demultiplexing
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Optical Communication System (AREA)
Abstract
Provided are a passive optical network system and a method of transmitting a broadcasting signal in the same system. A central office (CO) generates a broadcasting signal and a downstream optical data signal using a coding method guaranteeing a run-length, multiplexes the downstream optical data signal and the broadcasting signal, and transmits the multiplexed downstream optical data signal and broadcasting signal. A remote node (RN) transmits the multiplexed downstream optical data signal and broadcasting signal received from the CO to one or more optical network units (ONUs). A gain medium, which is located on a transmission line between the CO and the RN, amplifies the broadcasting signal using the downstream optical data signal as a pump light source. Accordingly, a high gain can be obtained by amplifying the broadcasting signal using the gain medium located on the transmission line without a separate pump light source.
Description
The cross reference of related application
This application requires to be committed to korean patent application 10-2004-0102954 number of Korea S Department of Intellectual Property and to be committed to the rights and interests of korean patent application 10-2005-0060875 number of Korea S Department of Intellectual Property on July 6th, 2005 on December 8th, 2004, by reference it all openly is herein incorporated.
Technical field
The method that the present invention relates to passive optical network and in same system, transmit broadcast singal, and, more specifically, the method that relates to passive optical network and under the situation of no separate pump light source (pump light source), transmit broadcast singal by amplifying signal.
Background technology
Along with the increase of high-quality broadcasting and recreation desired data, in user network, the requirement that transmits for fiber data increases.Particularly, for satisfying multi-medium data needs and high-quality broadcasting requirement in batch simultaneously, in the optical subscriber network, data and a plurality of high-quality broadcast channel of per second Mbytes up to a hundred is sent to each user.
Fig. 1 is the block diagram of traditional passive optical network system.
With reference to Fig. 1, passive optical network system comprises (the central office of central office, CO) 100, a plurality of optical network units (ONU) 120 and remote node (RN) 110, its remote node (RN) 110 is connected among a plurality of ONU 120 each with CO100, distribution data optical signal and broadcast singal, and carry out multiplexed to upstream (upstream) light signal.CO 100, a plurality of ONU 120 and RN 110 are connected to each other by optical cable 130 and 132.
CO 100 comprises: the conveyer that is used to broadcast (transmitter) (TX
BC) 102, be used to generate broadcast singal; Optical amplifier 104 is used for the loss that compensates optical transmission line when transmitting carrying out; Optical transceiver (the OTRX that is used for data
Data) 106, it generates data-signal and receives data-signal from a plurality of ONU 120; And wavelength multiplexer (MUX) 108, be used for carrying out multiplexed to broadcast singal and data-signal.
Downstream (downstream) data-signal that RN 110 will receive from CO 100 by optical cable 130 and broadcast singal are distributed to each a plurality of ONU 120, and, multiplexed by the upstream data signal is carried out, and will be sent to CO 100 from the upstream data signal that a plurality of ONU 120 receive.
Each ONU 120 comprises: wavelength multiplexer/demultiplexer (MUX/DEMUX) 122 is used for the downstream data signal and the broadcast singal that transmit from CO 100 by RN110 are carried out the multichannel decomposition; Receiver (the RX that is used to broadcast
BC) 126, be used for receiving broadcast signal; And the optical transceiver (OTRX that is used for data
Data) 124, be used to receive the downstream data signal and transmit the upstream data signal.
At title " Operational demonstration and filter alignment study of multiplebroadcast video delivery on a WDM passive optical network ", IEEE PhotonicsTechnology Letters, Vol.10, No.9, pp1331-1333, in the research paper of Sept.1998 in detail, this scheme has been described in detail.
In Fig. 1 in graphic traditional passive optical network system, in CO 100, used the optical amplifier 104 of the loss that is used to compensate broadcast singal.Yet optical amplifier 104 is very expensive, and, owing to use various parts to dispose optical amplifier 104,, thereby cause complicated system configuration so its configuration is very complicated.
Do not use optical amplifier to amplify broadcast singal so that the research paper of the structure that addresses this problem and patent are summarized as follows with being described in detail in the low price passive optical network by only using gain media:
At title " Bidirectional transmission scheme using intensity modulation of1.48 μ m pump laser diode for erbium-doped fiber amplifier ", Electronics Letters3rd, Vol.27, No.1, pp89-91, in 1991 the research paper, advised a kind of scheme, that is: use has the light source data of the wavelength of 1.48 μ m, by with wavelength is carried out signal that the 5MHz phase modulated obtains be sent to ONU and use resulting signal as data optical signal, and in gain media, use the exciting light source of resulting signal simultaneously as broadcast singal.Yet, in the case, because light source data is by phase modulated, so message transmission rate is very low in actual use, and, owing to comprised phase-modulator,, thereby cause the cost of data transmitter to increase so system configuration is very complicated.
Title has been advised a kind of scheme for U.S. Pat 2004/0131358 Al of " Passive Optical Network System providing simultaneously bothbroadcasting service and data service ", that is: have the data-signal among the CO and the exciting light source of broadcast singal by transmission, use the gain media of RN to amplify broadcast singal.Yet in the case, owing to used exciting light source, cost increases.
Summary of the invention
The invention provides the gain media that is used on the transmission line between central office (CO) that is positioned at passive optical network system under the situation of no separate pump light source, by use and the remote node (RN) comes amplifying signal to transmit the system and method for broadcast singal.
According to an aspect of the present invention, a kind of passive optical network system is provided, it comprises: central office (CO), its use guarantees that the coding method of haul distance (run-length) generates broadcast singal and downstream data optical signal, downstream data optical signal and broadcast singal are carried out multiplexed, and transmit multiplexed downstream data optical signal and broadcast singal; Remote node (RN), it will be sent to one or more optical network units (ONU) from multiplexed downstream data optical signal and the broadcast singal that CO receives; And gain media, it is on the transmission line between CO and the RN, and use downstream data optical signal amplifies broadcast singal as exciting light source.
According to a further aspect of the present invention, the method that is used for transmitting at passive optical network system broadcast singal is provided, described passive optical network system comprises central office (CO), remote node (RN) and one or more optical network unit (ONU), described method comprises: used by CO and guarantee that the coding method of haul distance generates broadcast singal and downstream data optical signal, downstream data optical signal and broadcast singal are carried out multiplexed, and transmit multiplexed downstream data optical signal and broadcast singal; Between CO and RN, use the downstream data optical signal to amplify broadcast singal as exciting light source; And multiplexed downstream data optical signal and broadcast singal are sent to one or more relevant ONU by RN.
Thereby, can be under the situation of no separate pump light source, the gain media that is positioned on the transmission line by use amplifies broadcast singal, and obtains high-gain.
Description of drawings
Fig. 1 is the block diagram of traditional passive optical network system;
Fig. 2 is the block diagram of passive optical network system according to an embodiment of the invention;
Fig. 3 is the optical transceiver (OTRX that is used for data of the central office (CO) of Fig. 2
Data) block diagram; And
Fig. 4 transmits the flow chart of the method for broadcast singal according to an embodiment of the invention in passive optical network system for diagram.
Embodiment
Now, will describe passive optical network system and broadcast singal transfer approach according to an embodiment of the invention in detail by the reference accompanying drawing.
Fig. 2 is the block diagram of passive optical network system according to an embodiment of the invention.
With reference to Fig. 2, passive optical network system comprises central office (CO) 200, remote node (RN) 210, one or more optical network unit (ONU) 220 and gain media 230.
CO 200 comprises the conveyer (TX that is used to broadcast
BC) 202, be used for the optical transceiver (OTRX of data
Data) 204 and multiplexer (MUX) 206.TX
BC202 comprise that generation will be provided for the light source of the broadcast singal of ONU 220, and, OTRX
Data204 uses guarantee that the coding method of haul distance generates the downstream data optical signal.The downstream data optical signal has and is suitable for coming amplitude and wavelength that broadcast singal is amplified by gain media 230, to have a wavelength or a plurality of wavelength that is different from broadcast singal.
206 couples of MUX are by TX
BC202 broadcast singals that generate and by OTRX
DataThe 204 downstream data optical signals that generate carry out multiplexed, and transmit multiplexed downstream data optical signal and broadcast singal downstream.OTRX
Data204 receive the upstream data optical signal that is generated, also transmitted by RN 210 by ONU 220.
CO 200, RN 210 and ONU 220 are connected to each other by single mode fibre, and, gain media 230 be arranged in CO 200 output, RN 210 the importation or connect the transmission line of CO 200 and RN 210.Gain media 230 uses by OTRX
DataThe 204 downstream data optical signals that generate amplify broadcast singal as exciting light source.
RN 210 is connected to ONU 220, and multiplexed broadcast singal and the downstream data optical signal that receives from CO 200 are distributed to ONU 220.RN 210 also carries out multiplexed to the upstream data optical signal that transmits from ONU 220, and multiplexed upstream data optical signal is sent to CO 200.For this reason, RN 210 comprises multiplexer/demultiplexer (MUX/DEMUX) 212, as separator, array wave length grating (AWG), waveguide optical grating, grating or coupler.
Each ONU 220 comprises: DEMUX 222, and it carries out the multichannel decomposition to broadcast singal and the downstream data optical signal that receives from RN 210; Receiver (the RX that is used to broadcast
BC) 226, its receiving broadcast signal; And OTRX
Data224, it receives the downstream data optical signal, and transmits the upstream data optical signal.
Fig. 3 is the OTRX of the CO 200 of Fig. 2
Data204 block diagram.
With reference to Fig. 3, the OTRX of CO 200
Data204 comprise downstream light signal maker 300, encoder 302, electricity/light (E/O) transducer 304, stream signal receiver 310, decoder 312, light/electricity (O/E) transducer 314 and signal selector 320.
For the downstream data optical signal, downstream light signal maker 300 generates the downstream data signal, and 302 pairs of downstream data optical signals of encoder are encoded, so that guarantee haul distance, and E/O transducer 304 will be the downstream data optical signal as the downstream data conversion of signals of the signal of telecommunication.Subsequently, signal selector 320 is selected the downstream data optical signal, and transmits described downstream data optical signal downstream.
For the upstream data optical signal, when receiving the data optical signal that is generated by ONU 220 by RN 210, signal selector 320 is sent to O/E transducer 314 with the upstream data optical signal.O/E transducer 314 is converted to the signal of telecommunication with optical signalling, and 312 pairs of described signals of telecommunication of decoder are decoded, and stream signal receiver 310 receives the signal of decoding.
Fig. 4 transmits the flow chart of the method for broadcast singal according to an embodiment of the invention in passive optical network system for diagram.
With reference to Fig. 4, in operation S400, CO uses and to guarantee that the coding method of haul distance generates broadcast singal and downstream data optical signal, downstream data optical signal and broadcast singal is carried out multiplexed, and transmits multiplexed downstream data optical signal and broadcast singal downstream.In operation S410, the gain media between CO and RN uses the downstream data optical signal to amplify broadcast singal as exciting light source.In operation S420, RN will amplify and the multiplexed downstream data optical signal that transmits is sent to one or more relevant ONU with broadcast singal by gain media.
As mentioned above, according to embodiments of the invention, can guarantee that the coding method of the haul distance more than several MHz transmits the downstream data optical signal downstream and by using gain media to utilize the downstream data optical signal to amplify the downstream broadcast signal as exciting light source, improve the receiving sensitivity of ONU from CO by use.Thus, configurable stable optical link, and, can realize the passive optical network system of saving.
Although illustrated and described this invention particularly by reference the preferred embodiments of the present invention, but it should be appreciated by those skilled in the art that, the present invention can make the various changes on form and the details, and does not break away from the spirit and scope of the present invention as the claims definition.The foregoing description should only be considered to descriptive meaning, rather than the purpose that is used to limit.Therefore, be not by detailed description of the present invention but define scope of the present invention, and all difference in the described scope will be understood to include in the present invention by claims.
Claims (6)
1, a kind of passive optical network system, it comprises:
Central office (CO), its use guarantees that the coding method of haul distance generates broadcast singal and downstream data optical signal, downstream data optical signal and broadcast singal are carried out multiplexed, and the downstream data optical signal and the broadcast singal that transmit multiplexed;
Remote node (RN), it will be sent to one or more optical network units (ONU) from multiplexed downstream data optical signal and the broadcast singal that CO receives; And
Gain media, it is on the transmission line between CO and the RN, and use downstream data optical signal amplifies broadcast singal as exciting light source.
2, the system as claimed in claim 1, wherein, downstream data optical signal that each ONU is multiplexed to what receive from RN and broadcast singal carry out multichannel and decompose.
3, the system as claimed in claim 1, wherein, CO comprises:
Conveyer (the TX that is used to broadcast
BC), it generates broadcast singal;
Optical transceiver (the OTRX that is used for data
Data), its use guarantees that the coding method of haul distance generates the downstream data optical signal; And
Multiplexer (MUX), it carries out multiplexed to broadcast singal and downstream data optical signal.
4, the system as claimed in claim 1, wherein, each ONU generates the upstream data optical signal, RN carries out multiplexed to the upstream data optical signal that receives from one or more ONU, and multiplexed upstream data optical signal is sent to CO, and CO receives the upstream data optical signal.
5, a kind of method that is used for transmitting broadcast singal at passive optical network system, wherein said passive optical network system comprises central office (CO), remote node (RN) and one or more optical network unit (ONU), described method comprises:
Use by CO and to guarantee that the coding method of haul distance generates broadcast singal and downstream data optical signal, downstream data optical signal and broadcast singal are carried out multiplexed, and the downstream data optical signal and the broadcast singal that transmit multiplexed;
Between CO and RN, use the downstream data optical signal to amplify broadcast singal as exciting light source; And
By RN will be multiplexed the downstream data optical signal be sent to one or more relevant ONU with broadcast singal.
6, method as claimed in claim 5 also comprises: by each ONU multiplexed downstream data optical signal and the broadcast singal that receives from RN carried out the multichannel decomposition.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20040102954 | 2004-12-08 | ||
| KR102954/04 | 2004-12-08 | ||
| KR60875/05 | 2005-07-06 | ||
| KR1020050060875A KR20060064489A (en) | 2004-12-08 | 2005-07-06 | Passive optical network and method for transmitting broadcasting-signal in the same network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1787409A true CN1787409A (en) | 2006-06-14 |
| CN1787409B CN1787409B (en) | 2010-06-09 |
Family
ID=36784745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101270653A Expired - Fee Related CN1787409B (en) | 2004-12-08 | 2005-11-30 | Passive optical network system and method of transmitting broadcasting signal in same |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20060064489A (en) |
| CN (1) | CN1787409B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007147341A1 (en) * | 2006-06-15 | 2007-12-27 | Huawei Technologies Co., Ltd. | Optical network system and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997002633A1 (en) * | 1995-07-05 | 1997-01-23 | Hitachi, Ltd. | Method of control of light amplification medium, light amplifier, and system using the same |
-
2005
- 2005-07-06 KR KR1020050060875A patent/KR20060064489A/en not_active Application Discontinuation
- 2005-11-30 CN CN2005101270653A patent/CN1787409B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007147341A1 (en) * | 2006-06-15 | 2007-12-27 | Huawei Technologies Co., Ltd. | Optical network system and device |
| CN101090297B (en) * | 2006-06-15 | 2012-07-04 | 华为技术有限公司 | Optical CDMA system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060064489A (en) | 2006-06-13 |
| CN1787409B (en) | 2010-06-09 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20100609 Termination date: 20111130 |