Cascaded injection of semiconductor lasers in period-one oscillations for millimeter-wave generation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)4905-4908
Journal / PublicationOptics Letters
Issue number19
Online published1 Oct 2019
Publication statusPublished - 1 Oct 2019


Period-one (P1) oscillations in semiconductor lasers are applicable in photonic millimeter-wave (mm-wave) generation. P1 oscillation can be invoked by optically injecting a laser, where the phase noise can be suppressed by modulation. To increase the frequency range of mm-wave generation, cascaded injection is investigated for enhancing the P1 oscillation harmonics. Relative to the optical frequency of the injection from a master laser, P1 oscillation at frequency f0 is induced in a primary slave laser which, in turn, injects a secondary slave laser for enhancing the harmonic at 2f0. Experimentally, photonic mm-wave generation at 2f0 = 72 GHz is demonstrated using P1 oscillations at f0 = 36 GHz. Subharmonic locking by modulation at f0∕4 = 9 GHz can suppress the output phase noise to −87 dBc∕Hz at 10 kHz offset. The mm-wave power can be strengthened by the coherent addition from the master laser. The mm-wave frequency can be tuned by varying the operating conditions of the lasers. Extension to higher frequencies is possible using the approach of cascaded injection.