Kuniaki Motoshima

TL;DR: The first experimental demonstration of a forward error correction (FEC) for 10-Gb/s optical communication systems based on a block turbo code (BTC) is reported and the ability of the proposed FEC system to achieve a receiver sensitivity of seven photons per information bit when combined with return-to-zero differential phase-shift keying modulation is demonstrated.

TL;DR: In this paper, the transmission performance of return-to-zero differential phase-shift keying (RZ-DPSK) with RZ-ON-OFF keying, non-return-to zero differential phase shift keying and NRZ-OOK was compared experimentally.

TL;DR: In this paper, an optical fiber which amplifies an input signal by a pump source, a compensation-signal source which injects a compensation signal propagating contra-directionally with respect to the input signal into the optical fiber, a gain detector which measures a spontaneous emission light of the pump source at an input side of the optical fibre and a compensation signal source controller which controls output of the compensation signal source based on output of gain detector.

TL;DR: Technical challenges of forward error correction (FEC) are reviewed and block turbo code having a net coding gain of higher than 10 dB will mature with the development of 3-bit soft decision LSI.

TL;DR: In this paper, an erbium-doped fiber amplifier with automatic channel-by-channel gain and power regulation function is discussed with much emphasis on the pump power control scheme and the requirement for feedback circuitry.