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Proceedings Paper

Time And Wavelength Division Optical Distribution System Using Acoustooptic Tunable Filter
Author(s): Yoshihiro Shimazu; Shiro Kikuchi
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Paper Abstract

A novel optical distribution system suitable for providing a large number of channels is proposed. Its characteristics are theoretically analyzed and experimentally examined. In this system, 150 Mb/s digital HDTV channels are time and wavelength multiplexed on a single mode fiber by an optical star coupler and distributed to each subscriber. Each subscriber selects one HDTV channel using an acoustooptic tunable wavelength filter and an electrical time-slot selector. This system can easily provide a large number of HDTV channels, since it simultaneously utilizes two multiplexing dimensions. In addition, the acoustooptic tunable wavelength filter, a key device in the system, is a stable and well-established device. The loss and crosstalk characteristics of the acoustooptic tunable filter are theoretically analyzed by Gaussian beam approximation. They show that one system can distribute 320 HDTV channels to 256 subscribers with a minimum wavelength spacing of 2 nm. An experimental 12 channel( 4 time division x 3 wavelength division) system with a wavelength spacing of 20 nm in the 1.3 μm region demonstrates that it can operate a data rate of 1.2 Gb/s with only 4dB loss and 20 dB crosstalk at the tunable filter. The access time to select one channel is 4 Rs . The minimum optical power at the optical receiver is 30 dBm, which means that this prototype can handle 256 subscribers. The experimental loss and crosstalk characteristics agree well with the theoretical analysis.

Paper Details

Date Published: 15 January 1990
PDF: 9 pages
Proc. SPIE 1179, Fiber Networking and Telecommunications, (15 January 1990); doi: 10.1117/12.963390
Show Author Affiliations
Yoshihiro Shimazu, NTT Communication Switching Laboratories (Japan)
Shiro Kikuchi, NTT Communication Switching Laboratories (Japan)


Published in SPIE Proceedings Vol. 1179:
Fiber Networking and Telecommunications
Joseph Garodnick; Lynn D. Hutcheson; David A. Kahn, Editor(s)

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