Paper Info
Title
Bandwidth-Flexible Wdm System Based On Homodyne Detection And Power Splitting Configuration
Abstract
Conventional WDM systems multiplex channels with different signal bandwidths using fixed and equal channel spacing. As a result, their spectral efficiency is rather poor. If the wavelength and the bandwidth of each channel in a WDM system could be freely changed as needed, a variety of services with different signal bandwidths could be accommodated efficiently. This is expected to yield high spectral efficiency. For this purpose, this paper proposes a WDM optically amplified system that combines optical power splitting with homodyne detection; its use in three configurations, point to point, ring (center to remote nodes), and peer to peer, is described. Coherent optical systems generally need a frequency stable local light source in addition to a sending light source in each WDM channel. We improve cost effectiveness by proposing that the output of one light source be divided to yield the local light for frequency selection by homodyne detection and the sending light source whose output is externally modulated by transmission signal. In this configuration, the local light level is low to permit high. levels of sending power. The key problem is how to get high SNR with limited low-level local lights. This paper derives the optimum receiving loss condition that can maximize the SNR with local light levels as low as -20 dBm for the point to point configuration. For the ring configuration, the system overcomes the optical power loss created by splitting numbers over 1,000 even if the local lights are as low as 0 dBm. The ring configuration can, therefore, flexibly accommodate many users and services. We also elucidate the relation between SNR and BER for DPSK homodyne detection in a bandwidth-flexible system.
Year
DOI
Venue
2005
10.1093/ietcom/e88-b.4.1531
IEICE TRANSACTIONS ON COMMUNICATIONS
Keywords
Field
DocType
flexible channel bandwidth, WDM system, homodyne detection, optical power splitter, SNR, optical amplifier
Wavelength-division multiplexing,Optical power,Telecommunications,Channel spacing,Data transmission,Computer science,Signal-to-noise ratio,Computer network,Electronic engineering,Bandwidth (signal processing),Spectral efficiency,Homodyne detection
Journal
Volume
Issue
ISSN
E88B
4
0916-8516
Citations 
PageRank 
References 
0
0.34
0
Authors
3
Name
Order
Citations
PageRank
Masaki Amemiya121.02
Jun Yamawaku200.34
Toshio Morioka3214.89