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Effect of Rayleigh backscattering from optical fibers on the DFB laser wavelength

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Injection lasers used in lightwave communications systems are extremely sensitive to optical feedback.1 One source of feedback is Rayleigh backscattering from optical fibers. This paper discusses the effects of Rayleigh backscattering on single-frequency distributed feedback (DFB) lasers. We find that Rayleigh backscattering not only narrows the laser linewidth2 but also induces random wavelength hopping within the range of a single-longitudinal-laser line.

© 1986 Optical Society of America

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