| Presentation | 1999/11/26 Noise Characteristics of Coherent Optical Amplifier Wataru Imajuku, Atsushi Takada, Yoshiaki Yamabayashi, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Coherent optical amplifiers can principally breakthrough the standard quantum limit of the 3-dB noise figure imposed on conventional amplifiers such as laser and Raman amplifiers. This paper analyzes the noise characteristics of the coherent optical amplifier using Kerr medium theoretically and experimentally. In theoretical analysis, we derived the quantum Langevin equation of a lossy Kerr medium, and obtained the quantum field operator and the photon number variation of output signal. In experimental study, we utilized a nonlinear fiber Sagnac interferometer as optical gain medium and achieved stable optical amplification by locking optical phase between signal and pump using optical injection with compensation PLL. The electrical spectrum analyzer method was employed for the noise figure measurement. By using a high nonlinearity fiber with the length of 3 km, the loss coefficient of -0.7 dB/km, and the nonlinear coefficient of 15.8/W/km, we successfully obtained low-noise figure optical amplification under the standard quantum limit, 2.0-dB noise figure with 16-dB gain. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Optical amplification / Optical parametric amplification / Coherent / Quantum noise |
| Paper # | LQE99-97 |
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| Conference Information | |
| Committee | LQE |
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| Conference Date | 1999/11/26(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Lasers and Quantum Electronics (LQE) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Noise Characteristics of Coherent Optical Amplifier |
| Sub Title (in English) | |
| Keyword(1) | Optical amplification |
| Keyword(2) | Optical parametric amplification |
| Keyword(3) | Coherent |
| Keyword(4) | Quantum noise |
| 1st Author's Name | Wataru Imajuku |
| 1st Author's Affiliation | NTT Network Innovation Laboratories() |
| 2nd Author's Name | Atsushi Takada |
| 2nd Author's Affiliation | NTT Network Innovation Laboratories |
| 3rd Author's Name | Yoshiaki Yamabayashi |
| 3rd Author's Affiliation | NTT Network Innovation Laboratories |
| Date | 1999/11/26 |
| Paper # | LQE99-97 |
| Volume (vol) | vol.99 |
| Number (no) | 467 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |