DocumentCode :
895625
Title :
Novel broad-band bit-synchronization circuit module for optical interconnections
Author :
Onodera, Kiyomitsu
Author_Institution :
NTT Photonics Labs., NTT Corp., Kanagawa, Japan
Volume :
52
Issue :
2
fYear :
2004
Firstpage :
475
Lastpage :
481
Abstract :
A novel broad-band and ultrafast bit-synchronization circuit module is proposed and fabricated for optical interconnections. In optical packet switch fabric or optical interconnection between electric circuit boards, instantaneous bit synchronization is crucial to properly retime incoming packets with a random phase and reduce the number of preamble overhead bits. The developed bit-synchronization circuit module has a new clock selection circuit, which is configured with a phase comparator and an amplitude comparator. Since device-dependent delay circuits, such as buffer amplifiers or RC phasors, are not adopted, the newly developed clock selection circuit can operate under broad-band frequencies. The bit-synchronization circuit module was fabricated with a Si-bipolar gate array and it can operate at broad-band bit rates of up to 10.5 Gb/s. It also exhibits a power sensitivity penalty as low as 3 dB for 10-Gb/s input signals. The synchronization acquisition time of less than 9 b over the entire 360° phase range was confirmed by experiment.
Keywords :
bipolar logic circuits; clocks; comparators (circuits); elemental semiconductors; logic arrays; optical interconnections; packet switching; phase comparators; photonic switching systems; silicon; synchronisation; 10.5 Gbit/s; Si; Si-bipolar gate array; amplitude comparator; broad-band bit rates; broad-band bit-synchronization circuit module; clock selection circuit; device-dependent delay circuits; electric circuit boards; input signals; instantaneous bit synchronization; optical interconnections; optical packet switch fabric; phase comparator; phase range; power sensitivity penalty; preamble overhead bits; random phase incoming packet retiming; synchronization acquisition time; ultrafast bit-synchronization circuit module; Circuits; Clocks; Delay; Frequency synchronization; Optical amplifiers; Optical fibers; Optical interconnections; Optical packet switching; Optical switches; Space vector pulse width modulation;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2003.821921
Filename :
1266871
Link To Document :
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