High-modulation-speed, spectrum-stabilized transmitters operating at 1.55 μm wavelength range are key components in the rapidly developing high-capacity long distance optical fiber communication systems. The latter spectral requirement is closely related to the time-broadening an optical pulse suffers as it propagates through dispersive fibers, and this pulse broadening seriously limits the bit-rate and the maximum transmission distance. External optical modulators have been studied intensively to overcome this problem, to avoid the large wavelength fluctuation (called chirp) that occurs with conventional directly modulated laser diodes.
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Publish Date: 01 March 1993
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