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Two-stage Er+3-doped fiber amplifier to generate transform-limited high-power pulses from a gain-switched 1.5-μm DFB laser diode

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Abstract

Generation of high-peak-power ultrashort optical pulses from 1.5-μm laser diodes (LDs) has been an important research subject for applications to ultrahigh-bit-rate optical communications, such as soliton transmission and all-optical fiber demultiplexers.1,2 We have used a two-stage Er+3-doped fiber amplifier (EDFA) to amplify low-power, highly chirped gain-switched pulses for such applications. When an optical bandpass filter (OBF) is placed between the first- and second-stage EDF As and its transmission bandwidth is reduced to narrower than the spectral width of the original gain-switched LD pulses, it induces a spectral-windowing effect that eventually provides a pulse-compression effect.3

© 1995 Optical Society of America

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