| Autor: |
William J. Miniscalco, Jagannath Chirravuri, B. Pedersen, Ta-Sheng Wei |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Integrated Photonics Research. |
| DOI: |
10.1364/ipr.1992.wd2 |
| Popis: |
Pumping erbium-doped fiber amplifiers (EDFAs) near 980 nm has attracted much attention as a result of the lower noise characteristics and higher pump efficiency achieved compared to those obtained at 1480nm. The narrow absorption profile of the fiber at the 980nm pump band is generally believed to impose a tight constraint on the laser operating wavelength. Recent results for small-signal amplification with pump powers of approximately 30mW revealed a gain reduction of < or = 3dB for pump wavelengths varying by 30nm, a bandwidth which is significantly larger than that of the 980nm absorption band. By reducing the cost of the pump lasers, this relaxed tolerance is expected to lower the overall cost of the EDFA as well as reduce the impact of temperature-induced wavelength drifts in the pump laser. We present an investigation of the effect of pump wavelength, lambda sub p, on the signal output of a power amplifier. The experiments yield a 1dB gain-penalty bandwidth in excess of 30nm. A quantitative amplifier model is used to show that pump wavelength tolerance increases with pump power and fiber numerical aperture (NA). For the first time the tradeoff in noise performance associated with this relaxed tolerance in the pump wavelength is examined. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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