Injection locking

About: Injection locking is a research topic. Over the lifetime, 4567 publications have been published within this topic receiving 60942 citations.

Modulation of Coherently Coupled Phased Photonic Crystal Vertical Cavity Laser Arrays

Abstract: The modulation properties of two-element photonic crystal ion-implanted coherently coupled vertical cavity surface emitting laser arrays emitting at 850 nm are reported. Single mode emission into either the in-phase or out-of-phase supermode and significant modulation bandwidth enhancement are obtained for both operating conditions. We model our device as a monolithically integrated, mutually optically injection-locked laser system and show that the phase detuning and injection ratio between array elements are critical parameters influencing modulation bandwidth. Comparison of our experimental measurements to our model is consistent with mutual injection locking. Modulation bandwidth greater than 30 GHz and up to 37 GHz is consistently found for several array designs. We show the modulation response can be tailored for different applications.

High-performance heterodyne optical injection phase-lock loop using wide linewidth semiconductor lasers

Abstract: The requirements for narrow linewidth lasers or short-loop propagation delay limit optical phase-lock loop realizability with semiconductor lasers. Although optical injection locking can provide low-phase-error variance, its locking range is limited by stability considerations. The first experimental results for an heterodyne optical injection phase-lock loop are reported. Phase-error variance as low as 0.003 rad/sup 2/ in a bandwidth of 100 MHz, single-sideband (SSB) noise density of -94 dBc/Hz at 10-kHz offset and mean time to cycle slip of 3/spl times/10/sup 10/ s have been achieved using DFB lasers of 36-MHz summed linewidth, a loop propagation delay of 20 ns and an injection ratio of -30 dB.

Stability analysis of self-injection-locked oscillators

Abstract: This paper addresses the stability analysis of the self-injection-locked oscillators. The analysis is developed for arbitrary self-injection feedback loops and illustrated with the specific case of a simple time-delay cable. It is shown that the output phase stability in self-injection-locked oscillators depends on the feedback loop delay and the types of oscillator circuits, which are represented by equivalent parallel- or series-resonant oscillator models. The self-injection-locked technique can also be used to test the oscillator circuit model when the self-coupling phase is known. The theory is verified by using a self-injection-locked GaAs MESFET oscillator operating at X-band with delay loops.

Theoretical studies on injection locking and injection-induced modulation of laser diodes

Abstract: Semiconductor laser injection locking behavior has been studied theoretically. Numerical analysis is carried out for various practical injection locking schemes, such as the spectral control of directly modulated laser diodes, the locking amplifier for FM signals, the FM noise suppression of self-excited diode laser oscillators, and the detuned injection light induced modulations in laser diodes.

A Divide-by-3 Injection Locked Frequency Divider With Single-Ended Input

Abstract: This letter proposes a new divide-by-3 CMOS injection locked frequency divider (ILFDMOS. ) fabricated in a 0.18-mum CMOS process and describes the operation principle of the ILFD. The ILFD circuit is realized with a double cross-coupled CMOS LC-tank oscillator with an injection MOS. The self-oscillating voltage controlled oscillator is injection-locked by third-harmonic input to obtain the division order of three. Measurement results show that at the supply voltage of 1.8 V, the free-running frequency is from 1.62 to 1.89 GHz. At the incident power of 5 dBm, the locking range is from the incident frequency 4.85 to 5.7 GHz.