Tsuyoshi Ikushima

Influence of clock structure on EMI level and audio clock jitter during high-speed serial transmission

In this study, we investigated the influence of the separate-clock structure and embedded-clock structure on the characteristics of electromagnetic interference (EMI) and audio clock jitter during high-speed serial transmission. We found that the EMI peak spectrum of a separate clock can be reduced by 11 dB if its frequency is decreased. The peak spectrum of transmission when using a separate clock is much lower than that of transmission when using an embedded clock, and results in less audio-clock jitter than transmission using an embedded clock.

Design of extended WDM access system for providing broadband communication and broadcast TV services

We propose extended WDM access system employing optical packet/SCM hybrid amplification scheme for supporting larger number of subscribers. For suppressing interference between optical packets and SCM signal, optimum operating conditions of EDFA are discussed.

Required performance for optical filter and EDFA in 32ch-WDM/310ch-SCM transmission system

We have developed a tunable optical filter (TOF) with 0.05 nm wavelength accuracy and an erbium doped fibre amplifier (EDFA) with a relative intensity noise (RIN) of -136 dB/Hz to realize 32ch-WDM/310ch-SCM systems, taking into account the effect of FM/AM conversion on carrier to noise ratio (CNR) in TOFs and the optimum optical input power into the EDFAs.