A method for generation and RF phase-shifting of millimeter-wave subcarrier signals using a single monolithic semiconductor laser device is proposed and demonstrated. Under fundamental or subharmonic hybrid mode-locking conditions, the optical cavity length of the laser is modulated by the thermo-optic effect in the passive waveguide section. As a result, the timing of the generated 33 GHz output optical pulse train was successfully varied over 10 ps, corresponding to phase-shifts over 2.7 and 5.3 rad for 33 and 66 GHz subcarriers, respectively. The mechanism of the RF phase-shift is explained by analogy with the injection-locked electrical oscillator.
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Hoshida et al. (1997) studied this question.
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