Abstract
Period-one (P1) dynamics induced by an optically injected semiconductor laser oscillate at microwave frequencies. The oscillation frequency of a P1 dynamic can be rendered nearly insensitive to small-signal parameter fluctuations and intrinsic laser noise at appropriate operating conditions of the master and slave lasers. In this paper, the noise-canceling properties of the various low-sensitivity (LS) operating points is demonstrated through their dependency on the noise fluctuation frequency and power. The three different types of LS operating points show their effectiveness in suppressing not only P1 intensity and frequency fluctuations caused by narrowband laser perturbations but also intensity and frequency noise caused by broadband intrinsic and extrinsic noise sources.
Highlights
Period-one (P1) dynamics are self-sustained intensity oscillations that can be induced by proper optical injection of a semiconductor laser
The P1 dynamics have been examined in several types of semiconductor lasers subject to external optical injection, including quantum-well distributed feedback lasers (DFBs) [3], [11], vertical-cavity surface-emitting lasers (VCSELs) [12], The associate editor coordinating the review of this manuscript and approving it for publication was San-Liang Lee
For different intensity- and frequency-fluctuation noise, the stability of the P1 oscillation against system parameter fluctuations are calculated through the amplitudes of the modulation sidebands relative to the P1 frequency amplitude, by modulating a specific operational parameter
Summary
Period-one (P1) dynamics are self-sustained intensity oscillations that can be induced by proper optical injection of a semiconductor laser. These limit-cycle oscillations emerge at critical operating points through a Hopf bifurcation due to undamped relaxation resonances of the semiconductor laser [1], [2] They are invoked by a cost-effective, all-optical configuration with innate single-sideband characteristics and are frequency-tunable reaching up to ten times the relaxation resonance frequency of the uninjected solitary laser [3]. At an LSξ operating point, injection strength fluctuations emerging from temperature and/or bias-current variations in the master and slave lasers are minimized. Detuning frequency fluctuations emerging from temperature and/or bias-current variations in the master and slave lasers are minimized at an LSf operating point. The LS operation can reduce the microwave frequency jitters due to path-length fluctuation and can reduce the emerging delay time side-peaks of a P1 oscillation under the optical feedback stabilization scheme mentioned above [18], [29].
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