Noise characteristics of Er3+-doped fiber amplifiers pumped by laser diodes
| Autor: | Shimizu Makoto, Masanobu Okayasu, Masaharu Horiguchi, Makoto Yamada, Etsuji Sugita |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Noise temperature
Materials science Noise-figure meter Computer Networks and Communications Relative intensity noise business.industry Noise spectral density Shot noise Physics::Optics General Physics and Astronomy Y-factor Astrophysics::Cosmology and Extragalactic Astrophysics Noise figure Optics Optoelectronics Astrophysics::Earth and Planetary Astrophysics Electrical and Electronic Engineering business Noise (radio) |
| Zdroj: | Electronics and Communications in Japan (Part II: Electronics). 74:19-31 |
| ISSN: | 1520-6432 8756-663X |
| DOI: | 10.1002/ecjb.4420741003 |
| Popis: | The noise characteristics of the Er3+-doped optical fiber amplifier pumped by laser diodes (LD) at 0.98 μm and 1.48 μm are theoretically and experimentally studied. The noise figures of the optical fiber amplifiers pumped by a 0.98–μm band LD and a 1.48–μm band LD estimated from the beat noise between the signal noise and the spontaneous emission were 3.2 and 4.1 dB. It was found that the beat noise between spontaneous emissions and the shot noise of the spontaneous emission were smaller in the 0.98 μm-band LD than in the 1.48–μm band LD. From these results, it was found that the optical fiber amplifier pumped by the 0.98–μm band LD has lower noise characteristics than those of the amplifier pumped by the 1.48 μm band LD. Further, the signal gain dependence, fiber length dependence and signal wavelength dependence of each noise component were studied. When the signal gain is kept constant, each noise component is not dependent on the fiber length and can be reduced monotonically by increasing the signal gain. When the wavelength deviates from the signal wavelength giving the maximum signal gain, the beat noise between the spontaneous emissions and the shot noise of the spontaneous emission increase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|