Excess Noise Generation During Spectral Boradening in Microstructure Fiber

Published

July 1, 2003

Author(s)

J N. Ames, S Ghosh

Abstract

We observe that nanojoule femtosecond pulses that are spectrally broadened in microstructure fiber acquire excess noise. The excess noise is namifest as an increase in the noise floor of the rf spectrum of the photocurrent from a photodetector illuminated by the pulse train from the oscillator. Measurements are made of the intensity dependence of the excess noise for both 100 fs and sub-10 fs pulses. The excess noise is very strong for 100 fs pulses, but barely measurable for sub-10 fs pulses. A rigorous quantum treatment of the nonlinear propagation of ultrashort pulses predicts that for a fixed generated bandwidth, the amount of excess noise decreases with pulse duration, in agreement with experimental results.

Citation

Applied Physics B

Volume

77

Pub Type

Journals

Keywords

continuum generation, microstructure fiber

Citation

Ames, J. and Ghosh, S. (2003), Excess Noise Generation During Spectral Boradening in Microstructure Fiber, Applied Physics B (Accessed March 13, 2025)