High Alumina Co-Doped Silica EDFA and Its Gain-Equalization in Long-Haul WDM Transmission System
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概要
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In an optical submarine cable transmission system, small size, low consumption power, and high reliability are required for inline repeaters. The structure of the inline repeater should be a simple single stage. The design of erbium doped fiber (EDF) itself is very important for the inline repeater to achieve broad bandwidth, high output power, and low noise figure. We designed and developed high alumina co-doped erbium doped fiber amplifiers (EDFAs) for long-haul, high-capacity WDM transmission systems. We investigated the trade-off relationship between the gain flatness and the output power to optimize the EDF length. We obtained high performance, including a slightly sloped gain flatness of +0.04dB/nm at 1550nm, a superior noise figure of 4.7dB, and a relatively large output power of +11.5dBm for an EDF length of 5m using a 1480-nm pumping laser diode. We applied gain-equalizers (GEQs) using Mach-Zehnder type filters with different FSRs to accurately compensate for the EDFAs' gain-wavelength characteristics. The main GEQs have free-spectral-ranges (FSRs) of 48-nm, which are about 2 times as long as the wavelength difference between a 1558-nm EDFA gain peak and a 1536-nm EDFA gain valley. Using a circulating loop with the above EDFAs and GEQs, we performed the broad wavelength bandwidth. The achieved signal wavelength bandwidth after 5,958-km transmission was 20nm. We successfully transmitted 700-Gbit/s (66×10.66-Gbit/s) WDM signals over 2,212km. The combination of high alumina co-doped silica EDFA and large FSR GEQ is attractive for long-haul, high-capacity WDM transmission systems.
- 社団法人電子情報通信学会の論文
- 2000-04-25
著者
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Naito Takao
The Authors Are With Optoelectronic Systems Laboratory Network System Laboratories Fujitsu Laborator
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SHIMOJOH Naomasa
The authors are with Optoelectronic Systems Laboratory, Network System Laboratories, Fujitsu Laborat
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TERAHARA Takafumi
The authors are with Optoelectronic Systems Laboratory, Network System Laboratories, Fujitsu Laborat
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TANAKA Toshiki
The authors are with Optoelectronic Systems Laboratory, Network System Laboratories, Fujitsu Laborat
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CHIKAMA Terumi
The authors are with Optoelectronic Systems Laboratory, Network System Laboratories, Fujitsu Laborat
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SUYAMA Masuo
The author is with Optical Submarine Transmission Division, Fujitsu Limited
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Suyama M
The Author Is With Optical Submarine Transmission Division Fujitsu Limited
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Chikama T
Fujitsu Lab. Ltd. Kawasaki‐shi Jpn
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Chikama Terumi
The Authors Are With Optoelectronic Systems Laboratory Network System Laboratories Fujitsu Laborator
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Chikama Terumi
Department Of Physics Faculty Of Science University Of Tokyo:fujitsu Laboratories Ltd.
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Suyama Masuo
The Author Is With Optical Submarine Transmission Division Fujitsu Limited
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Tanaka Tsuyoshi
Semiconductor Device Research Center Semiconductor Company Matsushita Electric Industrial Co. Ltd.
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Tanaka Toshiki
The Authors Are With Optoelectronic Systems Laboratory Network System Laboratories Fujitsu Laborator
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Shimojoh Naomasa
The Authors Are With Optoelectronic Systems Laboratory Network System Laboratories Fujitsu Laborator
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Terahara Takafumi
The Authors Are With Optoelectronic Systems Laboratory Network System Laboratories Fujitsu Laborator
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Tanaka T
Semiconductor Device Research Center Semiconductor Company Matsushita Electric Industrial Co. Ltd.
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