Extended Optical Fiber Line Testing System with L/U-Band Optical Coupler Employing 4-Port Circulators and Chirped Fiber Bragg Grating Filters for L-Band WDM Transmission (<Joint Special Issue> Recent Progress in Optoelectronics and Communications)
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概要
- 論文の詳細を見る
An optical fiber line testing system is essential for reducing maintenance costs and improving service reliability in optical access networks. NTT has already developed such a system called AURORA (Automatic optical fibeR opeR-Ations support system). As we already use the 1310 and 1550 nm wavelengths for communication, we use the 1650 nm wavelength for maintenance testing in accordance with ITU-T recommendation L.41. Recently, a long wavelength hand (L-band) that extends to 1625nm has begun to he used for WDM transmission. With a view to monitoring optical fiber cables transmitting L-band communication light, an attractive way of separating the U-band wavelength of the test lights from the L-band wavelength of the communication light, is to use a chirped fiber Bragg grating (FBG) filler because of its steep optical spectrum. However, it is difficult to measure fiber characteristics with an optical time-domain reflectometer (OTDR), because multi-reflections appear in the OTDK trace when FBG filters are installed at both ends of an optical fiber line. In this paper, we consider this problem and show that the reflection loss at the port of a test access module (TAM) must, be more than 36.6 dB. We also describe the system design for an extended optical fiber line testing system using an L/U-hand optical coupler, which has two chirped FBGs between two 4-port circulators for L-band WDM transmission. In this system, the reflection loss at a TAM port was 38, 1 dB and we confirmed that there was no degradation in the OTDR trace caused by multi-reflections at the optical filters.
- 社団法人電子情報通信学会の論文
- 2003-05-01
著者
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NAKAMURA Masakazu
Chiba University
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Nakamura Masakazu
Chiba Univ. Chiba Jpn
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Nakamura Minoru
Ntt Access Network Service Systems Laboratories Ntt Corporation
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Nakamura M
Hitachi Communication Technol. Ltd. Yokohama‐shi Jpn
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HONDA Nazuki
NTT Access Network Service Systems Laboratories, NTT Corporation
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ARAKI Noriyuki
NTT Access Network Service Systems Laboratories, NTT Corporation
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IZUMITA Hisashi
NTT Access Network Service Systems Laboratories, NTT Corporation
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Izumita Hisashi
Ntt Access Network Service Systems Laboratories Ntt Corporation
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Honda Nazuki
Ntt Access Network Service Systems Laboratories Ntt Corporation
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Araki N
Ntt Access Network Service Systems Laboratories Ntt Corporation
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Araki Noriyuki
Ntt Access Network Service Systems Laboratories Ntt Corporation
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Araki Noriyuki
Kdd Rampd Laboratories
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Nakamura Masakazu
Department Of Electronics And Mechanical Engineering Faculty Of Engineering Chiba University
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