Self-phase modulation and spectral broadening of optical pulses in semiconductor laser amplifiers

• Published in: IEEE journal of quantum electronics Vol. 25; no. 11; pp. 2297 - 2306
• Main Authors: Agrawal, G.P., Olsson, N.A.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.1989; Institute of Electrical and Electronics Engineers
• Subjects: Exact sciences and technology; Frequency; Fundamental areas of phenomenology (including applications); Laser theory; Lasers; Optical fiber communication; Optical pulses; Optics; Physics; Pulse amplifiers; Pulse modulation; Scanning probe microscopy; Semiconductor lasers; Semiconductor lasers; laser diodes; Semiconductor optical amplifiers; Shape
• ISSN: 0018-9197; 1558-1713
• DOI: 10.1109/3.42059

Amplification of ultrashort optical pulses in semiconductor laser amplifiers is shown to result in considerable spectral broadening and distortion as a result of the nonlinear phenomenon of self-phase modulation (SPM). The physical mechanism behind SPM is gain saturation, which leads to intensity-dependent changes in the refractive index in response to variations in the carrier density. The effect of the shape and the initial frequency chirp of input pulses on the shape and the spectrum of amplified pulses is discussed in detail. Particular attention is paid to the case in which the input pulsewidth is comparable to the carrier lifetime so that the saturated gain has time to recover partially before the trailing edge of the pulse arrives. The experimental results, performed by using picosecond input pulses from a 1.52- mu m mode-locked semiconductor laser, are in agreement with the theory. When the amplified pulse is passed through a fiber, it is initially compressed because of the frequency chirp imposed on it by the amplifier. This feature can be used to compensate for fiber dispersion in optical communication systems.< >