CN101227633A - Apparatus and method of optical sign switch based on FSK/ASK quadrature modulation - Google Patents
Apparatus and method of optical sign switch based on FSK/ASK quadrature modulation Download PDFInfo
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- CN101227633A CN101227633A CNA2007101763749A CN200710176374A CN101227633A CN 101227633 A CN101227633 A CN 101227633A CN A2007101763749 A CNA2007101763749 A CN A2007101763749A CN 200710176374 A CN200710176374 A CN 200710176374A CN 101227633 A CN101227633 A CN 101227633A
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Abstract
The invention discloses an information processing device, which is mainly used to the information generation, the transport and the reception of an IP-over-DWDM optical network, wherein the information processing device comprises an edge router, a transport module and a signal reception portion. The edge router realizes an effective carrying identification and a load through a single-distributed feedback laser and a Mach-Zehnder modulator. Additionally, the invention discloses a relative information transport process. The weaknesses that the current optical switching network only carries the load signals, and the identification signal which comprises the route information can only be transported in an electric switching network are overcame as the identification signals and the net load signals all adopt the FSK/ASK orthogonal association modulation mode, simultaneously, the FSK and the ASK signals all adopt the same optical wave length, which effectively increases the usage of the network wideband resource.
Description
Technical field
The present invention relates to optical communication field, particularly a kind of implementation method and device that exchanges based on the signal of FSK/ASK quadrature modulation.
Background technology
Along with the fast development of the Internet demand to the network bandwidth constantly enlarges, from the present communication network of transportation level is Optical Transmission Network OTN, but no matter the exchange aspect in communication network is circuit switched or packet switching, almost all is based on electricity exchange or route technology.Because the restriction of the speed bottle-neck of electronic technology, the rate signal of optical wavelength channel link carrying need carry out rate-matched at the switching node place.The direct result of bringing like this is the bottleneck that switching node becomes whole communication network, and the adaptive and rate adaptation operating of a large amount of light/electrical interface has reduced network resource utilization between two subnets, has reduced network performance, has improved network cost.If the electric switched sub-networks of communication network can be transformed to the light switched sub-networks, at present optical transmission subnet and electric switched sub-networks and deposit the problem that is produced and to be solved, thereby realize that whole communication network datum plane realizes seamless fusion on optical plane, realize that undoubtedly the light exchange should be the development trend of communication network.Similar traditional electric switching technology, the light switching technology also can roughly be divided into light path exchange (OCS, Optical CircuitSwitching), two big classes of light packet switching (OPS, Optical Packet Switching) from exchange hierarchy.People had proposed a kind of new light switching technology---optical mark switching technique in recent years, and its basic thought is light grouping route and a forwarding capability of directly realizing multi protocol label exchange (MPLS, Multi-Protocol Labeled Switching) at photosphere.Although research has up to now in this respect obtained the progress of some, but still be in the preliminary research stage, also have a large amount of problems still unresolved, also require further study.
Summary of the invention
Technical problem to be solved by this invention is: overcome existing signal switching network design and complicated operation, the frequency resource utilance is low, realize the bigger deficiency of difficulty, a kind of method of novel signal exchange is provided, has made that it is simple in structure, realize easily, have high network bandwidth resources utilance.
The optical mark switching technique scheme that the present invention adopts is:
At first the IP packet information forms frequency shift keying/amplitude shift keying (FSK/ASK, Frequency Shift Keying/Amplitude Shift Keying) quadrature associating modulation signal at edge router:
The header of low speed IP packet carries out direct intensity modulated to single distributed feed-back formula (DFB, Distributed Feed-back) laser, produces the FSK optical label signal, enters the M-Z modulator then.
The net load of High Speed IP packet converts the signal that is fit to Optical Fiber Transmission to through relevant coding techniques, is input to Mach-Zehnder modulators (MZM, Mach-Zehnder Modulator) then.
The MZM of edge router part is used for the IP net load is modulated to the FSK optical label signal, realizes that the quadrature of FSK/ASK is united modulation, produces the FSK/ASK signal.
Then, FSK/ASK orthogonal signalling process system transmissions part, and produce signal dispersion and introduce each noise like:
Erbium-doped fiber amplifier (EDFA, Erbium Doped Fiber Amplifiers) is used to improve the FSK/ASK signal transmission power, perhaps is amplified in the signal that weakens in the Optical Fiber Transmission.
Single mode dispersive optical fiber (SMF, Single Mode Fiber) and dispersion compensating fiber (DCF, DispersionCompensation Fiber) when long Distance Transmission path is provided to signal, produce positive and negative signal dispersion respectively.
At last, IP header (being carried by the FSK light signal) and IP net load (being carried by the ASK light signal) receiving unit that the signal by transmission and exchange enters system demodulate signal:
At first, coupler makes it enter fsk signal receiver and ASK signal receiver respectively the signal that the sends ratio separated into two parts in power.
Secondly, in the fsk signal receiver part, signal at first passes through narrow-band optical filter (OBPF, OpticalBandpass Filter), and by choosing the proper filter bandwidth, a peak point in the filtering fsk signal stays another single frequency signal information; Pass through photoelectric detector again, unifrequent light signal is converted into the signal of telecommunication, and small-signal is amplified by preamplifier; By the filter shape effect of low pass filter (LPF, Low PassFilter), the demodulation of IP header is come out at last.
In like manner, in ASK signal receiver part, at first pass through narrow-band optical filter from the signal of coupler, the noise that the filtering orthogonal signalling are introduced in channel; Through photoelectric detector the ASK signal in the FSK/ASK orthogonal optical signal is converted into the signal of telecommunication again, and small-signal is amplified by preamplifier; By the filter shape effect of low pass filter, the demodulation of IP net load is come out at last.
The invention has the beneficial effects as follows that FSK and ASK signal come down to same optical wavelength signal, therefore without any extra frequency resource consumption, network bandwidth resources utilance height.This modulation demodulation system is simple in structure in addition, and it is convenient to implement, and has actual operability.
Description of drawings
Fig. 1 is the structure chart of edge router of the present invention.Constitute by signal generator, DFB tunable laser, M-Z modulator (MZM), Gaussian filter (Gaussian Filter).
Fig. 2 is the novel signal system model schematic diagram that the present invention is based on the FSK/ASK quadrature modulation.Wherein hop is made of erbium-doped fiber amplifier (EDFA), monomode fiber (SMF), dispersion compensating fiber (DCF); Receiver section is made of coupler (Coupler), optical band pass filter (OBPF), photodetector, amplifier, low pass filter (LPF);
The FSK optical label signal spectrogram of Fig. 3 for modulating through Distributed Feedback Laser among the present invention;
Fig. 4 among the present invention without the time-domain diagram of the IP packet net load Payload of any modulation;
Fig. 5 is Label and Payload signal signal time-domain diagram after the FSK/ASK quadrature modulation among the present invention;
Fig. 6 is the spectrogram of signal behind the FSK receiver among the present invention.
Fig. 7 is the eye pattern of signal among the present invention through the ASK receiver;
Fig. 8 is the eye pattern of signal among the present invention through the FSK receiver
Embodiment
With example the present invention is described in further detail with reference to the accompanying drawings below:
Edge router as shown in Figure 1, at first will compile from the IP packet of Access Network, buffering and forward error correction (FEC, Forward Error Correction), afterwards the header (Label) of IP packet is separated with net load (Payload).
The header Label of low speed IP packet, the present invention are example with 155Mb/s, and Distributed Feedback Laser is carried out direct intensity modulated, and determine a wavelength X according to the network operation situation
0As the operation wavelength of laser, the present invention is with center frequency points f
0For 193.10THz is an example, utilize this laser chirp effect to produce frequency modulation(FM), promptly produce FSK optical label signal FSK Label.This process need be chosen appropriate frequency difference Δ f, and the present invention is that 20GHz is an example with frequency difference Δ f.Fig. 3 is its modulation spectrum figure.FSK Label enters M-Z modulator light signal input then.
And the net load Payload of High Speed IP packet, the present invention is example with 10Gb/s, Fig. 4 is its time-domain diagram.At first convert the signal format that is fit to Optical Fiber Transmission to, be input to the arm of M-Z modulator then, i.e. the signal of telecommunication control end of M-Z modulator through relevant coding techniques.
MZM part among Fig. 1, the net load Payload that will be input to the High Speed IP packet of signal of telecommunication control end by the external modulation technology is modulated on the low speed FSK optical label signal FSK Label of input, carries out light intensity modulation, i.e. ASK modulation.Thereby the quadrature of realizing the FSK/ASK of signal is united modulation, produces the FSK/ASK orthogonal signalling.Fig. 5 is a FSK/ASK quadrature modulation time-domain diagram.Simultaneously, this edge router is determined route according to IP header Label for the quadrature allied signal, sends it in the suitable core router to exchange, and wherein the core router part is omitted herein.The extinction ratio of MZM needs to choose according to system requirements the extinction ratio of appropriate MZM with the performance of considerable influence system in this part.
Shown in Figure 1 is edge router module among Fig. 2.Light grouping marking signal in the FSK/ASK of this formation quadrature modulation enters then as the transport module among Fig. 2, comprising:
Erbium-doped fiber amplifier (EDFA) after one is positioned at edge router, is used to improve the FSK/ASK signal transmission power, makes its transmission range long enough in optical fiber; Its two be arranged in transmission path or signal receiver before, be used for the energy that enhancing signal decays in Optical Fiber Transmission.
Single mode dispersive optical fiber (SMF) is used for providing long Distance Transmission path to the signal of input, produces the signal positive dispersion simultaneously.
Dispersion compensating fiber (DCF) is used for providing long Distance Transmission path to signal, the positive dispersion that appropriate compensating signal road produces through SMF.Wherein DCF can place SMF forward and backward or mix with SMF and to be connected.
FSK/ASK orthogonal signalling through transmission and exchange enter as the IP header of Fig. 2 and the receiver module of IP net load:
Coupler is used for the FSK/ASK orthogonal signalling that will the send ratio separated into two parts in power, and wherein a part enters fsk signal receiver, and another part enters the ASK signal receiver.
Fsk signal receiver is used to receive the signal from coupler, and isolates the optical label signal part in the orthogonal signalling, to fsk signal detect, amplification, filtering and judgement, demodulate marking signal, i.e. the header of IP packet.The signal that enters fsk signal receiver passes through respectively:
Narrow-band optical filter (OBPF) is chosen the proper filter bandwidth, is used for a peak point f of filtering fsk signal
1, stay single-frequency f
2Signal message.Fig. 6 for signal by the spectrogram behind the FSK narrow-band optical filter.
Photoelectric detector (PIN) and preposition electric amplifier receive the output of narrow-band optical filter, and the signal strength signal intensity of direct detection orthogonal optical signal, are about to fsk signal and are converted into the signal of telecommunication, thereby the demodulation of IP header is come out, and then that this is the faint signal of telecommunication amplifies.
Low pass filter receives the output of Photoelectric Detection and preposition electric amplifier, and IP data packet head information signal is carried out shaping, reduces the error rate of header signal.
The ASK signal receiver is used to receive the signal from coupler, and isolates the light payload information part in the orthogonal signalling, to the ASK signal detect, amplification, filtering and judgement, demodulate payload information.The signal that enters the ASK signal receiver passes through respectively:
Narrow-band optical filter (OBPF) is chosen the proper filter bandwidth, is used for the noise that the filtering orthogonal signalling are introduced at channel.
Photoelectric detector (PIN) and preposition electric amplifier receive the output of narrow-band optical filter, and the signal strength signal intensity of direct detection orthogonal optical signal, are about to the ASK signal and are converted into the signal of telecommunication, thereby the demodulation of IP net load is come out, and then that this is the faint signal of telecommunication amplifies.
Low pass filter receives the output of Photoelectric Detection and preposition electric amplifier, and IP payload user data information signal is carried out shaping, reduces the error rate of payload information.
To sum up, the present invention makes FSK and ASK signal belong to same optical wavelength signal owing to adopt based on FSK/ASK quadrature modulation mode mark optical information, has saved a large amount of network resources, should invent simple, easy row simultaneously, and make the signal exchange scheme have more actual operability.
In a word; the above only is preferred embodiment of the present invention; be not only to be used to limit protection scope of the present invention; should be understood that; for those skilled in the art; on content disclosed by the invention, can also make some equivalent variations and replacement, these equivalent variations and replacement also should be considered as being protection scope of the present invention.
Claims (8)
1. information processing and transmission equipment are used for generation, transmission and the demodulation of FSK/ASK quadrature associating modulated light signal, it is characterized in that, comprising:
Edge router, be used for the IP packet from Access Network compile, buffering and forward error correction, and the header of IP packet separated with net load.The header of the IP packet signal that serves as a mark then it is carried out the FSK modulation, and net load at a high speed carries out the ASK modulation by the control light intensity, realizes the quadrature modulation with header;
Signal transmission line is used to transmit the orthogonal optical signal that described edge router produces;
Signal receiver is used to separate the FSK/ASK orthogonal optical signal that described edge router produces, the signal transmission line transmission comes, and respectively fsk signal and ASK signal is detected, amplifies and adjudicate, and demodulates marking signal and net load;
2. described information processing according to claim 1 and transmission equipment is characterized in that, described edge router comprises:
Signal generator, be used for the IP packet from Access Network compile, buffering and forward error correction, and the header of IP packet separated with net load, produce the label information and the net load at a high speed of relative low speed;
Single distributed feedback laser is used for the low speed marking signal of input is carried out the FSK modulation.The IP header packet information signal that serves as a mark, drive a little bias current and directly modulate single distributed feedback laser, utilize the sign indicating number frequency of two spectral shifts of generation of warbling of laser, and determine the operation wavelength of some wavelength X as laser according to the operating position of network medium wavelength resource;
Mach-Zehnder modulators is used to realize that the quadrature of marking signal and net load unites modulation.The flag F SK signal of modulated low speed enters Mach-Zehnder modulators, and payload signal at a high speed enters the signal of telecommunication control end of Mach-Zehnder modulators, produce the ASK signal by intensity modulated, realize that the quadrature of FSK/ASK signal is united modulation the input fsk signal.
3. information processing according to claim 1 and transmission equipment is characterized in that, described FSK/ASK quadrature associating modulated light signal transmission line comprises:
Erbium-doped fiber amplifier is used to improve FSK/ASK orthogonal optical signal transmission power, perhaps is amplified in the signal that has weakened in the Optical Fiber Transmission;
The single mode dispersive optical fiber is used for providing long Distance Transmission path to signal;
Dispersion compensating fiber is used for providing long Distance Transmission path to signal, and compensation simultaneously is because the optical dispersion that the single mode dispersive optical fiber produces.
4. information processing according to claim 1 and transmission equipment is characterized in that, described receiver section comprises:
Coupler is used for the signal that will the send ratio separated into two parts in power, makes it enter fsk signal receiver and ASK signal receiver respectively;
Fsk signal receiver is used to receive the signal from coupler, and isolates the optical label signal part in the orthogonal signalling, to fsk signal detect, amplification, filtering and judgement, demodulate marking signal, i.e. the header of IP packet;
The ASK signal receiver is used for direct quadrature signal and carries out intensity detection, amplification, filtering and judgement, demodulates net load.
5. information processing according to claim 4 and transmission equipment is characterized in that, described fsk signal receiver comprises:
Narrow-band optical filter is used for a peak point of filtering orthogonal signalling frequency spectrum, stays another single frequency signal information;
Photoelectric detector and preposition electric amplifier, the single-frequency optical signals that is used for being produced by narrow-band optical filter is converted into the signal of telecommunication, and the demodulation of IP header is come out, and then the faint signal of telecommunication is amplified;
Low pass filter receives the output of Photoelectric Detection and preposition electric amplifier, and IP data packet head information signal is carried out shaping, reduces the error rate of header signal;
Described ASK signal receiver comprises:
Narrow-band optical filter is used for the noise that the filtering orthogonal signalling are introduced at channel;
Photoelectric detector and preposition electric amplifier receive the output of described narrow-band optical filter, and the signal strength signal intensity of direct detection orthogonal optical signal, are about to the ASK signal and are converted into the signal of telecommunication, thereby the demodulation of IP net load is come out, and then that this is the faint signal of telecommunication amplifies;
Low pass filter receives the output of Photoelectric Detection and preposition electric amplifier, is used for the net load signal of demodulation is carried out shaping, reduces the error rate of net load signal.
6. an information processing method that is applied to information processing according to claim 1 and transmission equipment is applied to generation, transmission and the reception of information, it is characterized in that, comprising:
The generation step of FSK/ASK united orthogonal light signal:
The IP packet that a Access Network transmits at first converges at the edge router signal generator, cushions and forward error correction, and its header is separated with net load, produces the marking signal and the net load signal at a high speed of low speed;
The marking signal of b low speed is realized the FSK modulation by the FSK modulator, afterwards signal is input to the light signal input of Mach-Zehnder modulators;
C net load signal at a high speed is input to the signal of telecommunication control end of Mach-Zehnder modulators, realizes the associating light modulation of FSK/ASK by the luminous intensity of control input marking signal, and signal is input to transmission line;
The transmitting step of FSK/ASK united orthogonal light signal:
D FSK/ASK quadrature allied signal is by the amplification of fiber amplifier, and passes through the transmission of positive dispersion fiber and negative dispersion optical fiber respectively, and the optical receiver part that arrives another edge router after wavelength Conversion and the route;
The reception and the demodulation step of FSK/ASK united orthogonal light signal:
E FSK/ASK orthogonal signalling are separated coupled apparatus by a light, in the ratio of power the light signal separated into two parts are entered fsk signal receiver and ASK signal receiver respectively;
The f orthogonal signalling form simple signal by optical narrow pass band filters, by photoelectric detector this single-frequency optical signals are converted into the signal of telecommunication, and demodulate fsk signal by the filter shape device;
G is with the demodulating process of step f, and orthogonal signalling are by optical narrow pass band filters filtering noise signal and form simple signal, demodulate the ASK signal by photoelectric detector and filter shape device.
7. information processing method according to claim 6, it is characterized in that, step b, signal is directly modulated single distributed feedback laser by a little bias current, utilize the chirp of laser to produce two spectrum sign indicating number frequencies, and determine the centre wavelength of some wavelength X as laser according to the operating position of network wavelength resource with suitable deviant.
8. according to right 6,7 described information processing methods, it is characterized in that fsk signal and ASK signal are in same signal frequency, and adopt the form on road altogether.The every router of orthogonal signalling only can be realized the high speed routing forwarding of payload information by the optical label signal that extracts and handle low speed.
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| CNA2007101763749A CN101227633A (en) | 2007-10-26 | 2007-10-26 | Apparatus and method of optical sign switch based on FSK/ASK quadrature modulation |
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| CNA2007101763749A CN101227633A (en) | 2007-10-26 | 2007-10-26 | Apparatus and method of optical sign switch based on FSK/ASK quadrature modulation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834671A (en) * | 2010-04-29 | 2010-09-15 | 上海交通大学 | Device for realizing single driving modulation of frequency shift keying light modulation signal |
| CN102624459A (en) * | 2012-03-13 | 2012-08-01 | 中国联合网络通信集团有限公司 | Generation method and device for FSK (frequency shift keying) optical labelling signal |
| CN104378699A (en) * | 2013-08-15 | 2015-02-25 | 上海斐讯数据通信技术有限公司 | Method for achieving communication in PON equipment |
| CN109842448A (en) * | 2019-01-24 | 2019-06-04 | 杭州电子科技大学 | Orthogonal modulation stamp methods based on reversion 4PPM line coding |
-
2007
- 2007-10-26 CN CNA2007101763749A patent/CN101227633A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834671A (en) * | 2010-04-29 | 2010-09-15 | 上海交通大学 | Device for realizing single driving modulation of frequency shift keying light modulation signal |
| CN102624459A (en) * | 2012-03-13 | 2012-08-01 | 中国联合网络通信集团有限公司 | Generation method and device for FSK (frequency shift keying) optical labelling signal |
| CN104378699A (en) * | 2013-08-15 | 2015-02-25 | 上海斐讯数据通信技术有限公司 | Method for achieving communication in PON equipment |
| CN109842448A (en) * | 2019-01-24 | 2019-06-04 | 杭州电子科技大学 | Orthogonal modulation stamp methods based on reversion 4PPM line coding |
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