Design of a10-Gbps burst-mode optical packet reveiver module and its demonstration in a WDM optical

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JOURNAL OF LIGHTW A VE TECHNOLOGY ,VOL.20,NO.7,JULY 2002Design of a 10-Gb/s Burst-Mode Optical Packet Receiver Module and Its Demonstration in a

WDM Optical Switching Network

Hideki Nishizawa ,Member,IEEE ,Yoshiaki Yamada ,Member,IEEE ,Keishi Habara ,Member,IEEE ,and Takaharu Ohyama Abstract—A 10-Gb/s burst-mode optical packet receiver module was fabricated.Its sensitivity was

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NISHIZAW A et al.:BURST-MODE OPTICAL PACKET RECEIVER MODULE

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Fig.2.Receiver configuration.

crosstalk signals is a serious problem in optical switching networks.In particular,in a large-scale network that includes many wavelength filters and optical loop buffers,the accumu-lation of coherent crosstalk signals generates bit-by-bit power fluctuation at the receiver end and degrades the sensitivity penalty of the receiver [11].A differential receiver,on the other hand,is able to tolerate bit-by-bit power fluctuations.Such a receiver demonstrates a tolerance against coherent crosstalk signal power of up to

330

that indicat fiber ampli bandwidth The optica photodetec

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Fig.4.Packet reception.(a)Optical input signal.(b)Differential signal.(c)Regenerated

signal.

Fig.5.DR-OSC principle of operation.

feedback loops (negative loop and positive loop).The DR-OSC operates at a matched resonate frequency of the two loops,controls the side modes,and continues to output a clock signal that is synchronized with the following data signal during a single packet length.The synchronization time of the circuit is depend on the round-trip time of the loop [13].In the case of the circuit that we have used,the ideal synchronization time is 1ns.

A thermal-error compensation circuit and a pulse translator are used to increase the flexibility of the DR-OSC.Since the resonance frequency of the DR-OSC depends on temperature,we added a thermomonitor and a feedback circuit to the oscil-lator to compensate for errors in the resonance frequency.The compensation range of the DR-OSC module is 7mV/degree.The DR-OSC uses 40preamble bits for clock synchronization.The pulse translator changes pulses of any width into pulses that have the width of a 40-bit clock signal.

A photograph of this receiver is shown in Fig.6.Disregarding the connectors,the board measures

30046mm.The receiver can be operated with a power supply of less than 20W (

Fig.7sho tolerance

and

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NISHIZAW A et al.:BURST-MODE OPTICAL PACKET RECEIVER MODULE1081

Fig.8.BER performance of the signal power-fluctuation tolerance.

Fig.9.Sensitivity penalty caused by arrival timing jitter and packet-by-packet

power fluctuation.

2dB.EDFA gain saturation was the chief factor in the sensi-

tivity penalty.Under high power fluctuation,gain saturation is

mainly caused by the optical power of the high-level packets.

The gain difference between the conditions of

.

This result shows that in all relative phases,the sensitivity

penalties caused by packet-arrival timing jitter less than

1.5dB,which is comparable to that of some all-optical clock

recovery circuits[15].The total sensitivity penalty due to

packet-by-packet power fluctuation and packet-arrival timing

jitter is less than2.9dB when

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Fig.11.Waveform of switched optical signals with WCS

module.

Fig.12.Sensitivity penalty incurred by arrival timing jitter (WDM optical switching demonstration).

consecutive optical packets,and the vertical axis is the sensi-tivity penalty at a BER of 10

24.8dBm,a sensitivity penalty due

to packet-arrival timing jitter of less than 1.5dB in arbitrary relative phase,and a total sensitivity penalty due to power fluctuation and packet-arrival timing jitter of less than 2.9dB

when the magnitude of packet-by-packet power fluctuation is 9dB.In an optical switching demonstration,it was found that the switching time of the WCS module is 1ns,and that no sensitivity penalty is incurred from optical switching.

We believe that this combination of 10-Gb/s burst-mode optical packet receivers and WCS modules will be a significant contribution in the development of large-scale optical switching networks.

A CKNOWLEDGMENT

The authors would like to thank H.Takeuchi,K.Kato,Y .Aka-hori,O.Mitomi,and H.Miyazawa for supplying some of the op-tical devices,and E.Sano for supplying a Manchester encoder.They would also like to thank T.Matsunaga,K.Sasayama,and H.Sanjo for their stimulating discussions.

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Hideki Nishizawa(M’98)was born in Nagano,Japan,in1971.He received the B.S.and M.S.degrees in physics from Chiba University,Chiba,Japan,in1994 and1996,respectively.

In1996,he joined NTT Network Service Systems Laboratories,Kanagawa, Japan.He is now with NTT Network Innovation Laboratories,Kanagawa,where he has been engaged in research on photonic switching systems.

Mr.Nishizawa is a Member of the Institute of Electronics,Information and Communication Engineers(IEICE)of Japan.

Yoshiaki Yamada(M’97)was born in Kanagawa,Japan,on June7,1967.He received the B.S.and M.S.degrees in electronics engineering from the Univer-sity of Electro-Communications,Tokyo,Japan,in1990and1992,respectively. In1992,he joined Nippon Telegraph and Telephone Corporation,Tokyo, where he was engaged in research on photonic switching systems.He is cur-rently with NTT Electronics Corporation,Tokyo,Japan.

Mr.Yamada is a Member of the Institute of Electronics,Information and Communication Engineers(IEICE)of Japan.Keishi Habara(M’83)was born in Tokyo,Japan,on April29,1958.He re-ceived the B.E.,M.E.,and Ph.D.degrees in electronic engineering from the University of Tokyo in1981,1983,and1992,respectively.

He joined Nippon Telegraph and Telephone Corporation,Tokyo,in1983, where he was engaged in research on photonic switching systems and optical signal processing systems.From1989to1990,he was with the California Insti-tute of Technology,Pasadena,as a visiting Associate.He is currently a Group Leader of Service Innovation Research Group at NTT Network Innovation Lab-oratories,Kanagawa,Japan.

Dr.Habara is a Member of the Institute of Electronics,Information and Com-munication Engineers of Japan(IEICEJ),the IEEE Communications Society, and LEOS.He received the Young Engineer Award of the IEICEJ in1989. Takaharu Ohyama received the B.E.degree from Kyusyu Institute of Tech-nology,Fukuoka,Japan,in1992and the M.E.degree from Kyusyu University, Fukuoka,in1994.

Since joining NTT Opto-electronics(now Photonics)Laboratories,Ibaraki, Japan,in1994,he has been engaged in research on hybrid integration in silica-based planar lightwave circuits.