CN2838151Y - AC coupled optical burst receiver - Google Patents
AC coupled optical burst receiver Download PDFInfo
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- CN2838151Y CN2838151Y CN 200420118414 CN200420118414U CN2838151Y CN 2838151 Y CN2838151 Y CN 2838151Y CN 200420118414 CN200420118414 CN 200420118414 CN 200420118414 U CN200420118414 U CN 200420118414U CN 2838151 Y CN2838151 Y CN 2838151Y
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Abstract
The utility model relates to an AC coupled optical burst receiver which comprises a photoelectric converter, a preamplifier, a main amplifier and a data clock amplifier. An optical signal is changed into electrical signal via the photoelectric converter, and then the electrical signal enters the main amplifier to carry out re-amplification and shaping via an AC coupling capacitor after amplified primarily via the preamplifier. Ultimately, the electrical signal enters a data clock regenerator to carry out sampling and decision. Consequently, the regenerative process of the signal is completed, wherein the capacitance value of the AC coupling capacitor is determined by a lead code of a burst data packet and the bandwidths of the preamplifier and the main amplifier which are arranged in a receiver are selected with 1.2 times or more width of the bandwidth of a received digital baseband signal. The utility model reduces the RC charging and discharging time by selecting the AC coupling capacitor with small capacitance value. Consequently, the transient response time caused by the capacitor is reduced. Thereby, the recovery time of the amplitude value of the signal voltage can be decreased. Simultaneously, the utility model selects the preamplifier and the main amplifier with large bandwidth and high gain to improve the power gain of the signal and make up for the signal low-frequency loss caused by small capacitance value of the AC coupling capacitor. Ultimately, the utility model can realize quick recovery and regeneration of burst data signals.
Description
Technical field
The present invention relates to optical communication system, relate in particular to a kind of optical burst receiver.
Background technology
In traditional optical communication system, in SONET, SDH, ATM and ETHERNET technology, optical receiver all is designed to continuous mode, promptly when user data of no use need be transmitted, making a start of optical communication system can be launched bell idles, to keep the clock synchronization of receiver; At the receiver place, the data that transmit from optical channel are continuously, and bell idles and user data do not carry out logic distinguishing at this.
Yet along with the rise of EPON-PASSIVE OPTICAL NETWORK (PON), the optical receiver of burst mode becomes new technical development focus.The main feature of such optical network communication system is: the transmitter that communication system is made a start can turn-off laser when user data of no use need be transmitted, do not send bell idles.Owing to there is not bell idles to keep clock synchronization, burst receiver uses the very short time to carry out the regeneration of signal and the recovery of clock when user data package arrives at every turn.Wherein this section recovery time is with the front end of the form additional user packet of lead code.The burst receiver of existing comparative maturity is developed in ATM PON (APON).Wherein be divided into direct-current coupling optical burst receiver and AC coupled optical burst receiver two classes.Concrete ins and outs can have " photoelectron laser " the 11st to roll up " Analysis of Burst mode Optical Receiver " in February, 2000 the 1st phase by document for reference, " electronic letters, vol " the 4th phase, " burst Synchronization Technology in the passive wide network of ATM " in April, 2000 all has more detailed introduction.Above-mentioned two literary compositions all can
Www.chinajournal.net.cnOn retrieve in full.
Because increasing rapidly of network data amount is also more and more higher to the rate requirement of burst receiver now.Recently IEEE propose about Ethernet passive optical network-ETHERNET PON (EPON) agreement draft version (recent release), i.e. 802.3ahD2., to the requirement of optical burst receiver be: speed is 1～35Gb/s; Clock and data recovery times are 400ns, and promptly the lead code time span is 400ns.
The relevant report of existing optical burst receiver does not mostly reach the above speed of 1Gb/s.As " burst Synchronization Technology in the passive wide network of ATM " mentioned receiver speed is at 155Mb/s, " Analysis of Burst mode Optical Receiver " emphasis is studied in theory, method for designing that they mention and test result all are to be based upon on the basis of analog result, therefore the design of discussing as if continuity " Analysis of Burst mode Optical Receiver " on 1～35Gb/s speed designs, and then its response time and bandwidth that relates to the device that makes up differentiator and integrator has been proposed very high requirement.Because the high-speed switching devices of commercially producing does not at present also generally reach the requirement of design, this brings very big obstacle with regard to the optical burst receiver of realizing the above speed of 1Gb/s for design.
Summary of the invention
The purpose of this invention is to provide and a kind ofly be different from as various existing burst receiver mentioned " Analysis of Burst mode Optical Receiver ", removed optical burst receiver from designs such as signal peak detect from circuit structure.
Optical burst receiver among the present invention does not adopt the baseline adjustment technology, does not adopt edge detecting technology yet, thereby does not have in the design to use differentiator and the integrator of mentioning in " Analysis of Burst mode Optical Receiver ", does not introduce the high speed peak detection circuit yet.The structure of structure chart that Fig. 3 is shown and common continuous mode AC coupled optical receiver is similar, light signal changes the signal of telecommunication into via optical-electrical converter, then after preamplifier and main amplifier signal amplification shaping, enter the judgement of sampling of data clock regenerator, finish the regenerative process of signal.But preamplifier is that the selection principle with the bandwidth selection principle of main amplifier and ac coupling capacitor appearance value is different fully with the design rule of traditional continuous mode AC coupled optical receiver among the design, thereby can distinguish mutually with the design of continuous mode AC coupled optical receiver.
The design feature of this optical burst receiver is the length decision ac coupling capacitor appearance value by lead code.Select little coupling capacitance appearance value for use, reduce RC and discharge and recharge the time, thus the transient response time that reduction is caused by electric capacity.Thus, can be reduced in the recovery time of signal voltage amplitude in main the putting, and then shorten, under identical lead code time situation, provide the more sufficient time to clock recovery because amplitude is recovered the shared lead code time.Little coupling capacitance can improve the lower limiting frequency of output signal spectrum, makes signal frequency composition loss with the reducing and increase of coupling capacitance, thereby causes receiver output eye opening to reduce, and receiver sensitivity reduces.Thereby another characteristics of introducing the design method: widen the channel width of receiver, the channel width among the design is selected as 1～3 times of signal bandwidth.Select big bandwidth high-gain low noise amplifier for use, i.e. the long-pending amplifier of high gain-bandwidth.This measure purpose is to promote the high-frequency gain of digital baseband signal, thereby increases the precipitous degree of signal rising edge and trailing edge, helps reducing the sampling False Rate that is caused by clock jitter.This measure simultaneously can't cause the deterioration of receiver output signal-to-noise ratio owing to the amplification of channel width.Because when the error rate one regularly, its one to one the signal to noise ratio parameter channel of any bandwidth all is suitable for.Noise power is directly proportional with channel width, and the channel that bandwidth is big can be introduced bigger noise power.Thereby to reach the same error rate, the channel that bandwidth is big certainly will be wanted the signal power that can provide bigger.For amplifier, the amplifier that bandwidth is big, it is big that its gain that provides is also wanted relatively, just can guarantee to satisfy the signal to noise ratio requirement such as the circuit transmission quality of communication protocols such as SONET, SDH, ATM and ETHERNET.Moreover, by the characteristics of the power spectrum self of digital baseband signal as can be known, the digital baseband signal that speed is low relatively, i.e. the big signal of pulse duration, its Power Spectrum Distribution will be higher than the high relatively digital baseband signal of speed at the energy of low frequency part.In sum, the amplifier that dedicated bandwidth is big can get bigger output signal power and better signal to noise ratio.
Technical scheme of the present invention is this AC coupled optical burst receiver, comprise optical-electrical converter, preamplifier, main amplifier, the data clock amplifier, light signal changes the signal of telecommunication into via optical-electrical converter, after preamplifier amplifies for the first time, enter main amplifier then and amplify shaping once more by ac coupling capacitor, finally enter the judgement of sampling of data clock regenerator, thereby finish the regenerative process of signal, wherein ac coupling capacitor appearance value determines that by the lead code of burst packet the preamplifier in the receiver and the bandwidth of main amplifier are chosen as 1.2 times and above bandwidth of the digital baseband signal bandwidth that receives.
Above-mentioned AC coupled optical burst receiver, its operation wavelength is in 1.31 mu m ranges.
Above-mentioned AC coupled optical burst receiver, its operation wavelength is in 1.55 mu m ranges.
Above-mentioned AC coupled optical burst receiver, the data rate of its reception are 1.25Gb/s, 2.5Gb/s or 10Gb/s.
Above-mentioned AC coupled optical burst receiver, its with photodiode as optical-electrical converter, and with the preamplifier of the integrated making of preamplifier, main amplifier is an individual chips.
Above-mentioned AC coupled optical burst receiver, it uses photodiode as optical-electrical converter, but the device separate with preamplifier, main amplifier is an individual chips.
Above-mentioned AC coupled optical burst receiver, as optical-electrical converter and preamplifier, main amplifier is an individual chips with the avalanche optoelectronic diode for it.
Above-mentioned AC coupled optical burst receiver, its with avalanche optoelectronic diode as optical-electrical converter, preamplifier independently, main amplifier is an individual chips.
Ac coupling capacitor appearance value selection principle is the determined preamble length that discharges and recharges the time less than the related protocol regulation of this electric capacity and main load impedance in the design of this optical burst receiver.The bandwidth value of preamplifier and main amplifier is all in 1～3 times of scope of signal bandwidth.The device parameters of the burst mode optical receiver of choosing by above-mentioned rule is different fully with continuous mode AC coupled optical receiver relevant parameter.
This AC coupled optical burst receiver by choosing the ac coupling capacitor of little capacitance, reduces RC and discharges and recharges the time, thus the transient response time that reduction is caused by electric capacity.Thus, can reduce the recovery time of signal voltage amplitude.Simultaneously, choose big bandwidth high-gain preamplifier and main amplifier, improve signal power gain, remedy the signal low frequency loss that little ac coupling capacitor appearance value causes, finally can realize the fast quick-recovery and the regeneration of bursty data signal.
Description of drawings:
Fig. 1 is the basic format of burst packet.Wherein the effect of lead code is to allow therefrom restore data level of optical burst receiver, so allow behind the receiver data clock restorer recovered clock and to the data that receiver the recovers judgement of sampling.
Fig. 2 is the influence of the transient response process that causes of ac coupling capacitor to bursty data packet header data level, and with Fig. 1 in the burst packet basic format corresponding relation in time described.
Fig. 3 is a structure chart of the present invention.
Embodiment
Now be illustrated with example: the coupling capacitance representative value of traditional 1.25Gb/s Ethernet optical receiver is 0.01 μ F, and the bandwidth representative value of preamplifier and main amplifier is 75% of signal bandwidth, i.e. 900MHz.This programme is that the design parameter of the optical burst receiver chosen under the 1.25Gb/s EPON environment is based on the 802.3ahD2 draft: coupling capacitance type representative value value is 2.2nf, and the RC time of discharging and recharging is 110ns; The bandwidth representative value of preamplifier and main amplifier is chosen as 150% of line code speed, i.e. 1.8GHz.
1 at first determines the speed of digital baseband signal, thereby determines this signal bandwidth.
2 according to about designing the burst packets preamble length that defines in the communication protocol under the receiver, determines the maximum of ac coupling capacitor, makes the RC time of discharging and recharging of this electric capacity be no more than preamble length.According to the standard capacitor appearance value distribution table that can buy, determine the optional scope of capacitance, general, it is 1/3 of preamble length that optional appearance value of choosing friends the stream coupling capacitance makes the RC time of discharging and recharging.
3 choose preamplifier and the main amplifier that bandwidth is 1～3 times of a signal bandwidth.The bandwidth of two kinds of amplifiers should be identical.Choosing of bandwidth is big more, and the price of its respective devices is high more, but can't promote the performance of the design's method.Therefore proposed bandwidth is chosen 3 times that are not more than signal bandwidth.
The suggestion of choosing of 4 data clock regenerators uses support SONET or SDH to use the data clock regenerator that operating rate and data rate are suitable.
Claims (8)
1. AC coupled optical burst receiver, it is characterized in that, comprise optical-electrical converter, preamplifier, main amplifier, the data clock amplifier, light signal changes the signal of telecommunication into via optical-electrical converter, after preamplifier amplifies for the first time, enter main amplifier then and amplify shaping once more by ac coupling capacitor, finally enter the judgement of sampling of data clock regenerator, thereby finish the regenerative process of signal, wherein ac coupling capacitor appearance value determines that by the lead code of burst packet the preamplifier in the receiver and the bandwidth of main amplifier are chosen as 1.2 times and above bandwidth of the digital baseband signal bandwidth that receives.
2. AC coupled optical burst receiver as claimed in claim 1 is characterized in that this AC coupled optical burst receiver operation wavelength is in 1.31 mu m ranges.
3. AC coupled optical burst receiver as claimed in claim 1 is characterized in that this AC coupled optical burst receiver operation wavelength is in 1.55 mu m ranges.
4. AC coupled optical burst receiver as claimed in claim 1, the data rate that it is characterized in that its reception is 1.25Gb/s, 2.5Gb/s or 10Gb/s.
5. AC coupled optical burst receiver as claimed in claim 1 is characterized in that with photodiode as optical-electrical converter, and with the preamplifier of the integrated making of preamplifier, main amplifier is an individual chips.
6. AC coupled optical burst receiver as claimed in claim 1 is characterized in that using photodiode as optical-electrical converter, but the device separate with preamplifier, main amplifier is an individual chips.
7. AC coupled optical burst receiver as claimed in claim 1 is characterized in that using the avalanche optoelectronic diode as optical-electrical converter and preamplifier, and main amplifier is an individual chips.
8. AC coupled optical burst receiver as claimed in claim 1 is characterized in that selecting for use the avalanche optoelectronic diode as optical-electrical converter, preamplifier independently, and main amplifier is an individual chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420118414 CN2838151Y (en) | 2004-10-15 | 2004-10-15 | AC coupled optical burst receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420118414 CN2838151Y (en) | 2004-10-15 | 2004-10-15 | AC coupled optical burst receiver |
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| CN2838151Y true CN2838151Y (en) | 2006-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200420118414 Expired - Fee Related CN2838151Y (en) | 2004-10-15 | 2004-10-15 | AC coupled optical burst receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075256A (en) * | 2011-01-24 | 2011-05-25 | 成都优博创技术有限公司 | Method and device for improving sensitivity of burst light receiver |
| CN101335571B (en) * | 2008-07-22 | 2012-02-15 | 华为技术有限公司 | Optical receiver, optical network system and light receiving method |
-
2004
- 2004-10-15 CN CN 200420118414 patent/CN2838151Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335571B (en) * | 2008-07-22 | 2012-02-15 | 华为技术有限公司 | Optical receiver, optical network system and light receiving method |
| CN102075256A (en) * | 2011-01-24 | 2011-05-25 | 成都优博创技术有限公司 | Method and device for improving sensitivity of burst light receiver |
| CN102075256B (en) * | 2011-01-24 | 2015-08-05 | 成都优博创技术有限公司 | Improve method and the device of sensitivity of burst light receiver |
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| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |