A Passive Double Star Optical Subscriber System with Frequency Division Duplex Transmission and Flexible Access

Kazuhisa KAEDE
Yukitsuna FURUYA

IEICE TRANSACTIONS on Communications   Vol.E75-B    No.9    pp.841-849
Publication Date: 1992/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Fiber-Optic Subscriber Loop)
FTTC/FTTH,  PDS,  pipe-line polling,  pulsed PSK,  pulsed FM,  

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A passive double star (PDS) optical subscriber system which employs a newly proposed flexible access and frequency division duplex transmission system has been reported. For the flexible access and efficient channel usage in subscriber PDS system, a modified pipe-line polling with a call-by-call basis channel assignment has been proposed. This access system has a wide covering range which exceeds 10km or more. A newly proposed pulsed PSK transmission and a baseband transmission are used for a single wavelength bi-directional transmission for to and from the central office. A pulsed FM single subcarrier transmission system is also proposed for the analog CATV distribution system, which is overlaid with wavelength division multiplexing on the bi-directional transmission system. The equipments for the pulsed PSK and the pulsed FM transmission can be realized with all digital circuits. Moreover, the pulsed signal's modulation nature has eased the requirement for the laser diode characteristics, such as linearity and RIN. These features are effective for the compact and cost effective transmission systems.