Efficient erbium-doped fiber amplifiers incorporating an optical isolator
| Autor: | Michalis N. Zervas, Richard Ian Laming, David N. Payne |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Optical amplifier
Optical fiber Materials science Optical isolator business.industry Amplifier Isolator chemistry.chemical_element Condensed Matter Physics Noise figure Atomic and Molecular Physics and Optics law.invention Optical pumping Erbium Optics chemistry law Fiber laser Wavelength-division multiplexing Electrical and Electronic Engineering business |
| Zdroj: | IEEE Journal of Quantum Electronics. 31:472-480 |
| ISSN: | 0018-9197 |
| DOI: | 10.1109/3.364402 |
| Popis: | A composite-EDFA configuration which incorporates an optical isolator has been investigated theoretically and experimentally. The isolator prevents the build-up of the backward-ASE and results in an amplifier with high gain and near-quantum-limited noise figure (NF). The optimum position of the isolator has been calculated as a function of the pump power so that minimum NF and maximum gain are achieved simultaneously. It is shown that under practical pump powers, the optimized composite EDFA exhibits a gain improvement of about 5 dB and a NF reduction in excess of 1.5 dB when compared with an optimized conventional EDFA. It is also shown that with further optimization the composite EDFA can be employed in a practical fiber link as a pre-amplifier without the use of an input isolator. Finally, a high-gain composite EDFA has been experimentally demonstrated which exhibits a gain of 51 dB (54 dB) and NF of 3.1 dB for only 435 mW (93 mW) of pump power. > |
| Databáze: | OpenAIRE |
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