Accession Number : ADP008188

Title :   Gain and Noise Performance of Erbium-Doped-Fiber Power Amplifiers Pumped Between 960 and 1000 nm,

Corporate Author : GTE LABS INC WALTHAM MA

Personal Author(s) : Chirravuri, Jagannath ; Miniscalco, W. J. ; Wei, T. ; Pedersen, B.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : 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.

Descriptors :   *POWER AMPLIFIERS, AMPLIFIERS, ERBIUM, FIBERS, GAIN, LASER PUMPING, NOISE, NUMERICAL APERTURE, OUTPUT, PUMPING, SIGNALS.

Subject Categories : Electrical and Electronic Equipment
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE