CN1805311A - Method for implementing optical virtual private network in passive optical network - Google Patents
Method for implementing optical virtual private network in passive optical network Download PDFInfo
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- CN1805311A CN1805311A CNA2006100234546A CN200610023454A CN1805311A CN 1805311 A CN1805311 A CN 1805311A CN A2006100234546 A CNA2006100234546 A CN A2006100234546A CN 200610023454 A CN200610023454 A CN 200610023454A CN 1805311 A CN1805311 A CN 1805311A
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Abstract
The invention relates to a method for realizing optical virtual network in the passive optical network, which comprises: 1, modulating the VPN internal service and the non-VPN internal service, in the optical network unit; 2, processing time division multiple access in the coupler of optical network unit between groups of signals; 3, injecting the signal into the feedback Prague laser diode; 4, when the signal reaches the optical divider, one part is distributed to the narrow band reflector which can recognize and reflect the signal relative to the VPN internal service according to the frequency, and the VPN internal ONU via the wave band receiver receives returned VPN internal signal; when another part reaches the terminal of optical line, the wide band receiver according to the frequency recognizes and receives the signal relative to the non-VPN internal service. The inventive TDM-FDM format avoids the expensive modulator, while the drive signal can be attained easily, and each ONU needs only one couple of sender and receiver.
Description
Technical field
What the present invention relates to is a kind of method of technical field of optical fiber communication, specifically, is a kind of employing time division multiplexing one frequency division multiplexing (TDM-FDM) modulation format is realized OVPN in EPON method.
Background technology
EPON (PON) be economical, multiple services user's access technology faces the future.The PON technology is the optical fiber access technology of a kind of point to multiple spot, is made up of optical network unit and optical link unit.It has two wavelength channels: up channel and down channel.Descending employing TDM broadcast mode, up employing TDMA (time division multiple access access) mode, and can form topological structures such as tree type, star-like, bus-type neatly.On the other hand, VPN (VPN) is fast-developing in recent years emerging Internet service.It has fully utilized conventional network resources, has fully satisfied the demand that the client is set up private network, privately owned communication under low situation about dropping into.The virtual support private network is a kind of effective raising virtual private network service throughput and the effective ways that reduce time delay in EPON.And in traditional passive optical network structure, communication between the optical network unit (ONU) need be by the forwarding of optical link unit, the photoelectricity phototransformation of optical line terminal has expended a large amount of time, has reduced communication efficiency, thereby can't support the VPN intercommunication expeditiously.
Find through literature search prior art, support in the prior art of communication in the ONU group, people such as C.Chae are published in the article " A PON System Suitable for InternetworkingOptical Network Units Using a Fiber Bragg Grating on the Feeder Fiber (using Bragg grating to realize the interconnected PON system of optical network unit in the optical fiber branch line) " in scholarly publication " IEEE Photonics Technology Letters " (" IEEE photon technology wall bulletin ") 1999 the 11st volume, mention and between optical fiber branch line star coupler and OLT, placed a Bragg grating, this Bragg grating can reflect from the light of ONU and by coupler and be broadcasted to other ONU, does not need so just can realize communication between the ONU through OLT.The shortcoming of this technology is that each ONU needs two transmitters and two receivers, has increased the cost of system widely.Also find in the retrieval, support in the prior art of communication in the ONU group, be published in the article " A Packet-Switched Waveband-selective PON EnablingOptical Internetworking among ONUs (between optical network unit, realizing the selective waveband optical-fiber network of the packet switch of light interconnection) " in European Conference on Optical Communication 2005 (2005 ECOC Eeuropean Conference on Optical Communications) and disclose a kind of technology, promptly placed a Fast Adjustable speculum to reflect the packet of VPN inside, the transmission of transmission and non-vpn service when still this scheme can not be supported the VPN interior business at optical line terminal.
Summary of the invention
The objective of the invention is to overcome defective and the deficiency that exists in the passive optical network technique of existing virtual support private network application, a kind of method that realizes OVPN in EPON is proposed, by adopting the TDM-FDM modulation format, make it on the basis of minimizing cost, support VPN interior business and non-vpn service effectively.
The present invention is achieved by the following technical solutions, may further comprise the steps:
(1) in optical network unit, VPN interior business and non-VPN interior business are modulated smaller or equal to 50% NRZ with duty ratio by external circuit, and non-VPN interior business respective signal amplitude is less than the signal amplitude of VPN internal data bag;
(2) two groups of signals carry out time division multiplexing by the mixer in the optical network unit;
(3) signal after the time division multiplexing injects distributed-feedback Prague formula laser diode (DFB-LD), and the difference of drive signal amplitude has caused the difference on the two paths of signals frequency;
When (4) signal is from DFB-LD arrival optical branching device, one the tunnel gives the narrowband reflection mirror, the narrowband reflection mirror is according to frequency identification and reflect the pairing signal of VPN interior business, and VPN interior lights network element receives the VPN internal signal that feeds back to by the wavestrip receiver; Another road arrives optical line terminal (OLT), and the broadband receiver of optical line terminal is according to frequency identification and receive non-VPN interior business institute respective signal.
In the step (1), the specific requirement of described optical network unit is, each optical network unit is assigned a fixing transmission wavestrip and the fixing wavestrip that receives, and the reception wavestrip of inner all optical network units of VPN is identical and comprise the transmission wavelength of all optical network units in the VPN.
In the step (3), described distributed-feedback Prague formula laser diode (DFB-LD) is used for the signal of telecommunication after the time division multiplexing is carried out light modulation to obtain the TDM-FDM signal, the modulation wavelength difference of DFB-LD in each optical network unit, it is included in the reception wavestrip of oneself.
In the step (4), described narrowband reflection mirror can realize by Bragg reflection grating and optical coupler or by the light reflection mirror based on MEMS, is used for filtering and reflects the wavelength signals of VPN interior business correspondence.It can be placed near the optical branching device of 1 * N, with the loss of signal of avoiding optical line terminal to bring to the Optical Fiber Transmission between the optical branching device.
In the step (4), described optical branching device, or adopt the wavestrip multiplexer, be used for and issue each optical network unit along separate routes from the downstream message of optical line terminal, and will be divided into two-way from the upstream message of optical network unit, and one the tunnel passes to the narrowband reflection mirror, and one the tunnel passes to optical line terminal.
In the step (4), the broadband receiver in the described optical line terminal is used to receive the packet from all optical network units and EPON exterior node.Wavelengthtunable transmitter in the optical line terminal sends wavelength by it, sends packet to different optical network unit nodes.
The generation of TDM-FDM form does not need expensive modulator among the present invention, and drive signal just can obtain by the commercial devices of maturation, and only needs a pair of transmitter and receiver in each optical network unit, and hardware cost does not increase.Adopt after this modulation format, VPN interior business in the network and non-VPN interior business can transmit simultaneously, and a stationary mirror just can be realized the reflection of VPN interior business, have finished all optical communication between the VPN interior lights network element.
Description of drawings
Fig. 1 is a fundamental diagram of the present invention
Fig. 2 is an embodiment of the invention schematic diagram
Fig. 3 is embodiment of the invention figure as a result
Wherein, Fig. 3 (a) is the multiplexing signal of telecommunication eye pattern that makes zero that is used for Driven DF B-LD; (b) be light territory signal after the DFB-LD modulation; (c) be the TDM-FDM spectrogram, resolution is 0.07; (d) be the tributary signal at the VPN interior business place behind the demultiplexing.
Embodiment
As shown in Figure 1, the pseudo random sequence of generation is modulated to the NRZ (RZ) of duty ratio 50% by external circuit with it.This RZ signal is divided into two-way by the radio frequency splitter, and this two paths of signals amplifies by radio frequency amplifier.One road signal wherein delayed time and decay produce phase place and the amplitude different with other one road signal.Again two paths of signals is merged and injection distributed feed-back formula Bragg laser diode.Thereby, two tributary signals generate the TDM-FDM signal because having different amplitudes.Signal is through behind the mixer, wherein a road reach the Bragg reflection grating, VPN interior business respective signal is reflected.Another road signal passes the receiver that optical fiber arrives optical line terminal.Shown DFB LD is arranged in the transmitter of the optical network unit of VPN among the figure (1), and the wavestrip receiver of received signal belongs to the another one optical network unit of same VPN.
As shown in Figure 2, a kind of specific embodiment of the present invention.The length of the non-return-to-zero of error rate detector generation 1.25Gb/s reaches the PRBS pseudo-random bit sequence of 231-1; The centre wavelength of the Bragg grating that is adopted is 1549.6nm, bandwidth 0.1nm; Optical fiber between splitter and the OLT adopts the long monomode fiber of 12km that is.
As shown in Figure 3, be that the present invention is applied to experimental result shown in Figure 2.Fig. 3 (a) shows the multiplexing signal of telecommunication eye pattern that makes zero that is used for Driven DF B-LD, and the VPN interior business has different amplitudes with non-VPN interior business respective signal, and amplitude is 2: 1 than approximately; Fig. 3 (b) is the light territory signal after the DFB-LD modulation, and two ways of optical signals has different amplitudes to produce the TDM-FDM signal; Fig. 3 (c) is the TDM-FDM spectrogram, resolution is 0.07, the amplitude ratio that injects the two path signal of DFB-LD is 2: 1, again because the output wavelength of DFB-LD is relevant with the injection size of current, thereby cause the wavelength difference distance of modulation back two ways of optical signals, show among the figure that the wavelength distance of two paths of signals λ 1 and λ 1 ' is approximately 0.1nm; Fig. 3 (d) is the tributary signal at the VPN interior business place behind the demultiplexing, the TDM-FDM modulation signal sends through behind the optical branching device from DFB-LD, one the tunnel gives the narrowband reflection mirror, the wavelength of mirror reflects wavelength and VPN interior business respective signal, so VPN interior business respective signal is reflected, but not VPN interior business respective signal is because wavelength is different with the mirror reflects wavelength, so be not reflected, shown eye pattern among the figure by the tributary signal of narrowband reflection mirror (FBG) reflection, only comprise one road signal as can be seen in the eye pattern, signal waveform has small distortion, and this is because direct the warbling of bringing of modulation and for fear of crosstalking of adjacent legs and the filtering of deliberately introducing skew causes of DFB-LD.
Claims (6)
1. a method that realizes OVPN in EPON is characterized in that, may further comprise the steps:
(1) in optical network unit, VPN interior business and non-VPN interior business are modulated smaller or equal to 50% NRZ with duty ratio by external circuit, and non-VPN interior business respective signal amplitude is less than the signal amplitude of VPN internal data bag;
(2) two groups of signals carry out time division multiplexing by the mixer in the optical network unit;
(3) signal after the time division multiplexing injects distributed-feedback Prague formula laser diode, and the difference of drive signal amplitude has caused the difference on the two paths of signals frequency;
When (4) signal is from distributed-feedback Prague formula laser diode arrival optical branching device, one the tunnel gives the narrowband reflection mirror, the narrowband reflection mirror is according to frequency identification and reflect the pairing signal of VPN interior business, and VPN interior lights network element receives the VPN internal signal that feeds back to by the wavestrip receiver; Another road arrives optical line terminal, and the broadband receiver of optical line terminal is according to frequency identification and receive non-VPN interior business institute respective signal.
2, the method that in EPON, realizes OVPN according to claim 1, it is characterized in that, in the step (1), the specific requirement of described optical network unit is: each optical network unit is assigned a fixing transmission wavestrip and the fixing wavestrip that receives, and the reception wavestrip of inner all optical network units of VPN is identical and comprise the transmission wavelength of all optical network units in the VPN.
3, the method that in EPON, realizes OVPN according to claim 1, it is characterized in that, in the step (3), described distributed-feedback Prague formula laser diode, be used for the signal of telecommunication after the time division multiplexing is carried out light modulation to obtain the TDM-FDM signal, the modulation wavelength difference of distributed-feedback Prague formula laser diode in each optical network unit, it is included in the reception wavestrip of oneself.
4, the method that in EPON, realizes OVPN according to claim 1, it is characterized in that, in the step (4), described narrowband reflection mirror, realize by Bragg reflection grating and optical coupler or by light reflection mirror based on MEMS, be used for filtering and reflect the wavelength signals of VPN interior business correspondence, it is placed near the optical branching device, with the loss of signal of avoiding optical line terminal to bring to the Optical Fiber Transmission between the optical branching device.
5, according to claim 1 or the 4 described methods that in EPON, realize OVPN, it is characterized in that, in the step (4), described optical branching device, or adopt the wavestrip multiplexer, be used for the downstream message from optical line terminal is issued each optical network unit along separate routes, and will be divided into two-way from the upstream message of optical network unit, one the tunnel passes to the narrowband reflection mirror, and one the tunnel passes to optical line terminal.
6, according to claim 1 or the 4 described methods that in EPON, realize OVPN, it is characterized in that, in the step (4), in the described optical line terminal, broadband receiver receives the packet from all optical network units and EPON exterior node, the wavelengthtunable transmitter sends wavelength by it, sends packet to different optical network unit nodes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610023454A CN100596038C (en) | 2006-01-19 | 2006-01-19 | Method for implementing optical virtual private network in passive optical network |
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| CN200610023454A CN100596038C (en) | 2006-01-19 | 2006-01-19 | Method for implementing optical virtual private network in passive optical network |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101569122A (en) * | 2007-05-30 | 2009-10-28 | 华为技术有限公司 | Interleaving for 10g gpon |
| CN101860399A (en) * | 2010-04-21 | 2010-10-13 | 上海交通大学 | Passive optical network system fusing wireless and full optical virtual private network services |
| CN105025399A (en) * | 2014-04-21 | 2015-11-04 | 江苏艾思特信息科技有限公司 | Passive optical interconnection structure |
| CN107820141A (en) * | 2017-10-25 | 2018-03-20 | 北京智芯微电子科技有限公司 | The method and system that a kind of passive optical network service influenza is known |
-
2006
- 2006-01-19 CN CN200610023454A patent/CN100596038C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101569122A (en) * | 2007-05-30 | 2009-10-28 | 华为技术有限公司 | Interleaving for 10g gpon |
| CN101860399A (en) * | 2010-04-21 | 2010-10-13 | 上海交通大学 | Passive optical network system fusing wireless and full optical virtual private network services |
| CN101860399B (en) * | 2010-04-21 | 2012-11-28 | 上海交通大学 | Passive optical network system fusing wireless and full optical virtual private network services |
| CN105025399A (en) * | 2014-04-21 | 2015-11-04 | 江苏艾思特信息科技有限公司 | Passive optical interconnection structure |
| CN107820141A (en) * | 2017-10-25 | 2018-03-20 | 北京智芯微电子科技有限公司 | The method and system that a kind of passive optical network service influenza is known |
| CN107820141B (en) * | 2017-10-25 | 2020-02-21 | 北京智芯微电子科技有限公司 | Method and system for sensing service flow of passive optical network |
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| Publication number | Publication date |
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| CN100596038C (en) | 2010-03-24 |
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