Cavity enhancement of resonant frequencies in semiconductor lasers subject to optical injection

Abstract

The injection of an optical signal into a semiconductor laser biased near or above the lasing threshold modifies the coupling between the free carriers and the intracavity field. The detuning between the frequency of the injected signal and the free-running oscillation frequency and the ratio of the photon lifetime to the carrier lifetime are key parameters in determining the enhancement of the carrier-field resonant coupling frequency and the stability of the output field. Experimental results using a vertical cavity surface emitting laser biased near threshold are in agreement with calculations using a lumped-element oscillator model.

Optical Properties and Modulation Characteristics of Ultra-Strong Injection-Locked Distributed Feedback Lasers

“…This enhancement has been predicted theoretically, based on rate equation simulations [10]. Recently, Murakami et al [12] provided a simple physical picture of the enhancement process.…”

“…It has also been used to provide direct optical phase modulation [9]. More recently, optical injection locking has been employed to enhance the resonance frequency and modulation bandwidth of the slave laser [10]- [13].…”

“…The enhancement of resonance frequency [10] and modulation bandwidth [5], [11], [18]- [21] becomes significant. This enhancement has been predicted theoretically, based on rate equation simulations [10].…”

Amplitude Modulation Response and Linearity Improvement of Directly Modulated Lasers Using Ultra-Strong Injection-Locked Gain-Lever Distributed Bragg Reflector Lasers

“…Strong optical injection locking is a promising technique to suppress the nonlinear distortion as well as increase the resonance frequency of directly modulated semiconductor lasers [12][13][14][15][16][17]. The nonlinear distortions are more pronounced near the relaxation oscillation frequency of the laser due to the nonlinear coupling between electrons, photons, and phase difference between master and slave.…”

Optical Single Sideband Modulation Using Strong Optical Injection-Locked Semiconductor Lasers

“…Note that the RF signals with different frequencies are applied to achieve the largest for the different injection ratios ( GHz for dB, GHz for dB, and GHz for dB). The dependence of on stems from the evolution of the cavity mode across the locking range [8]- [10]. The largest asymmetry is observed for positive frequency detuning, where the cavity resonance effect is significant.…”