Upgrade of Passive Optical Subscriber Network

Norio Kashima

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


This paper describes an upgrade method for a two-way broad-band service transmission of a previously proposed passive optical subscriber network (PASS-NET). PASS-NET uses OFDM/TDM techniques for downstream transmission and TDMA for upstream. Fundamental experiments for downstream transmission to two subscribers are executed to demonstrate the possibility of the upgrade method. Two wavelengths emitted by a tunable laser (DBR-LD) with a 5-GHz (0.04 nm) space between them are directly intensity modulated at 32 Mb/s. Each wave transmits narrow-band service to each subscriber. The third wavelength emitted by another tunable laser (DBR-LD) with an 11-nm separation from the two wavelengths is directly intensity modulated at 100 Mb /s and overlaid. Three waves transmitted over a 10-km single-mode fiber are demultiplexed by a 1 x 2 wavelength selective star coupler. One subscriber receives two waves, one for a 32-Mb/s burst transmission and another for a 100-Mb/s continuous transmission. Both narrow-band and broad-band data are successfully transmitted and bit error rates are measured for both transmissions.

Original languageEnglish
Pages (from-to)113-120
Number of pages8
JournalJournal of Lightwave Technology
Issue number1
Publication statusPublished - 1991 Jan 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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