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Second-order intermodulation distortion as a diagnostic tool for the performance of analog DFB laser modules

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Abstract

Electronic predistortion of distributed-feedback (DFB) lasers is usually required for meeting analog-system performance requirements. To determine the characteristics that make a laser predistortable, we have evaluated about 100 DFB lasers from several manufacturers by using a number of diagnostic tests. These tests included optical spectrum, optical backreflection, L/I, dL/dI, dV/dI. FM response, and second-order two-tone intermodulation (IMD2) response. Although each lest provides insight into one or more aspects of laser linearity performance, IMD2 has proven to be the most useful diagnostic test.

© 1994 Optical Society of America

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