A study on system technologies for large channel ultra-dense WDM systems

Research Project

Project/Area Number	12650376
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	情報通信工学
Research Institution	Shizuoka University
Principal Investigator	AIDA Kazuo Shizuoka University, Engineering, Professor, 工学部, 教授 (00311704)
Project Period (FY)	2000 – 2001
Project Status	Completed (Fiscal Year 2001)
Budget Amount *help	¥3,600,000 (Direct Cost: ¥3,600,000) Fiscal Year 2001: ¥1,500,000 (Direct Cost: ¥1,500,000) Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywords	dense WDM / optical packet / receiver / EDFA / fiber loop / wavelength selectivity / eye diagram / tunable filter / 光増幅器
Research Abstract	Configuration of highly selective tunable receiver for several thousands channel optical packet dense WDM systems has been studied. Performance evaluation of the receiver using new test methods confirms the feasibility of ultra-dense WDM spaced by several GHz. The receiver consists of optical switches at input and output ports of a fiber loop, which contains fiber delay line, tunable optical band-pass filters, an erbium-doped fiber amplifier, and an optical switch. Target packet is selected from input optical packet WDM signals by time and wavelength windows realized by the optical switches, and the tunable filters, respectively. Wavelength selectivity enhancement is realized by the target packet multiple circulation in the loop. The receiver performance ; SNR, wavelength selectivity and interference from adjacent WDM signals, are evaluated from the eye diagram measured by an oscilloscope with a test signal which simulates optical packet dense WDM. The test signal consists of a test packet modulated by PRBS synchronously with a packet period, and 7 channel ultra-dense WDM signals spaced by 0.5 GHz, modulated by different bit-rate from that of the test packet. The receiver fiber loop employed tunable disk filters, a gain stabilized EDFA, low PDL isolators and a magnetooptical switch to realize high selectivity, high stability and low noise. The receiver could detect the optical packet without eye degradation after 30 times loop circulation from ultra-dense WDM spaced by 1 GHz.