Skew-Compensation Technique for Parallel Optical Interconnections

Takeshi SAKAMOTO  Nobuyuki TANAKA  Yasuhiro ANDO  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.8   pp.1428-1434
Publication Date: 1999/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Issue on Recent Progress in Optoelectronics and Communications)
Category: Optical Systems and Technologies
parallel optical interconnection,  skew,  skew compensation,  frame code,  frame synchronization,  bit synchronization,  

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We have developed a low-latency, error-correcting-code-(ECC-)adaptable skew-compensation technique, which is needed for high-speed and long-distance parallel optical interconnections. A new frame-coding technique called shuffled mB1C encoding, which requires no clock-rate conversion circuit and no data buffering, and a new skew-measurement method which is suitable for ECC adaptation have been developed for the compensation. Full-digital skew-compensation circuits using these new techniques were able to compensate for a two-clock-cycle skew, even when one transmission channel was removed. The maximum latency for skew compensation was only five clock cycles.