Characteristics in Neodymium-Doped Fiber Amplifiers at 1.06 μm

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概要

• 論文の詳細を見る

• We have investigated the gain and noise figure characteristics of a Nd-doped silica single-mode fiber amplifier (NDFA) at 1.06 μm which is applicable to various systems using a Nd:YAG laser light source at 1.06 μm, such as free-space laser communications, a fiber sensing system, and a Lidar system. A fluorescence spectrum observation of the Nd-doped fibers with various co-dopants shows that the Nd-Al co-doped fiber is suitable for realizing a high-gain amplifier for the 1.06 μm wavelength region. The pump wavelength tolerance at around 0.81 μm, the gain bandwidth and the sufficient value of the Nd concentration and length product for achieving maximum small signal gain are clarified. A noise figure of almost 3 dB and small signal gain of more than 30 dB are attained by 50-mW pump power. The unique four-level system characteristics, even in low pump power conditions, provide low noise amplification in the NDFA. These gain and noise characteristics are well described by a simple theoretical model. We also demonstrated high-power operation of the NDFA with four pump LD modules adopting a polarization-multiplexing technique. More than 100-mW signal output power is available for 1-mW signal input power at 200-mW launched pump power. These features of the NDFA as a compact, polarization-independent, spatial-beam-distortion-free amplifier, will allow it to replace the solid sate laser in various applications using a Nd:YAG laser light source at 1.06 μm.

• 社団法人電子情報通信学会の論文
• 1996-06-25

著者

• KAMIYA Yukihiro

  The authors are with ATR Adaptive Communications Research Laboratories

• KARASAWA Yoshio

  ATR Optical and Radio Communications Research Laboratories

• Miyazaki T

  Kyoto Univ. Kyoto‐shi Jpn

• YOSHIDA Minoru

  Mitsukaido Laboratories, Institute of Environmental Toxicology

• Karasawa Y

  Atr Adaptive Communications Res. Lab. Kyoto‐fu Jpn

• MIYAZAKI Tetsuya

  ATR Optical and Radio Communications Research Laboratories

• Miyazaki T

  Ntt Corp. Yokosuka‐shi Jpn

• Yoshida M

  Department Of Chemistry Faculty Of Science Tokyo Institute Of Technology

• Karasawa Yoshio

  Atr Optical And Radio Comm. Research Labs.

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