Masamichi Fujiwara

TL;DR: In this paper, an optical carrier supply module (OCSM) was proposed for superdense wavelength division multiplexing (SD-WDM) networks that utilize a large number of wavelengths with narrow channel spacing.

TL;DR: In this paper, the authors achieved a 512-channel super-dense wavelength division multiplexing (WDM) transmission with a 12.5 GHz channel spacing over 320 km (80 km/spl times/4) of standard single-mode fiber in the C+L-bands.

TL;DR: In this article, the shape of a spectrum of a multi-wavelength light is controlled so that predetermined RIN and SNR can be obtained in accordance with transmission system parameters (the type and distance of optical fibers, the number of repeaters).

TL;DR: A burst-mode digital signal processing architecture for digital coherent time-divisionmultiplexed passive optical network (PON) upstream transmission, wherein two key advances are introduced to shorten the preamble length of burst signals required to complete adaptive equalization, as performed by a constant modulus algorithm.

TL;DR: In this paper, a real-time burstmode coherent receiver (BMCR) is proposed to enable wide dynamic range reception for future passive optical network (PON) applications, wherein two key burstmode components are implemented; an automatic gain controlled semiconductor optical amplifier (AGC-SOA) for optical power equalization and a real time digital signal processor (DSP) with a frame detection (FD) function.