An optical sweeper is constructed with a 1.5μm distributed Bragg reflector (DBR) laser for quick frequency-response measurement of high-speed optical receivers. The laser is successfully controlled over a 16 GHz tuning-range by using adouble-heterodyne frequency-locked loop. S/N-improved measurement is also demonstrated at sweep speeds as fast as l GHz/s.
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Ishida et al. (1989) studied this question.
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