Gain Equalizer in Long-Haul WDM Transmission System(Special Issue on High-Capacity WDM/TDM Networks)
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概要
- 論文の詳細を見る
To expand signal wavelength bandwidth in long-haul, large-capacity WDM transmission systems, we investigated gain-equalizers(GEQs) for Erbium doped fiber amplifiers(EDFAs). We applied GEQs using Mach-Zehnder type filters with two different free-spectral-ranges(FSRs) to accurately compensate for the EDFAs' gain-wavelength characteristics. The 1st GEQ with a longer FSR was the main GEQ to compensate for the overall gain-wavelength characteristics, and the 2nd GEQ with a shorter FSR was the secondary GEQ to compensate for the resultant gain undulation after the 1st GEQ. The 2nd GEQ had low maximum loss and long period of equalization-spacing compared to the 1st GEQ. We designed that the FSR for the 1st GEQ was twice the signal wavelength bandwidth, and the FSR for the 2nd GEQ was two thirds of the signal wavelength bandwidth. To compensate for the asymmetry in the EDFAs' gain-wavelength characteristics, we designed that the 2nd GEQ minimum-loss wavelength was shorter than the 1st GEQ maximum-loss wavelength. Using a circulating loop with a 21-EDFA chain, we confirmed the signal wavelength bandwidth expanded by the above GEQs. We also investigated the trade-off relationship between the signal wavelength bandwidth and the optical signal-to-noise ratio, as the parameter of the number of the 1st GEQ inserted in the EDFAs' chain. The achieved signal wavelength bandwidth after 10,000-km transmission was 12 nm. We successfully transmitted 170 Gbit/s(32 × 5.332 Gbit/s)WDM signals over 9,879 km employing high alumina codoped EDFAs and Mach-Zehnder type filters with long FSRs.
- 社団法人電子情報通信学会の論文
- 1998-08-25
著者
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Naito Takao
The Authors Are With Optoelectronic Systems Laboratory Network System Laboratories Fujitsu Laborator
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NAITO Takao
Optoelectronic Systems Laboratory, Network System Laboratories, FUJITSU LABORATORIES LTD.
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TERAHARA Takafumi
Optoelectronic Systems Laboratory, Network System Laboratories, FUJITSU LABORATORIES LTD.
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SHIMOJOH Naomasa
Optoelectronic Systems Laboratory, Network System Laboratories, FUJITSU LABORATORIES LTD.
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CHIKAMA Terumi
Optoelectronic Systems Laboratory, Network System Laboratories, FUJITSU LABORATORIES LTD.
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SUYAMA Masuo
The author is with Optical Submarine Transmission Division, Fujitsu Limited
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SUYAMA Masuo
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
Optoelectronic Systems Laboratory Fujitsu Laboratories Ltd.
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Chikama Terumi
Department Of Physics Faculty Of Science University Of Tokyo:fujitsu Laboratories Ltd.
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Tanaka Tsuyoshi
Semiconductor Device Research Center Semiconductor Company Matsushita Electric Industrial Co. Ltd.
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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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