Topic
Injection locking
About: Injection locking is a research topic. Over the lifetime, 4567 publications have been published within this topic receiving 60942 citations.
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TL;DR: In this paper, a 32.48 GHz optical clock with low level of timing jitter (0.38 ps) and high extinction ratio (23 dB) was recovered from a return-to-zero input optical data stream.
Abstract: We present a new scheme for realizing optical clock recovery by injection locking a long cavity Fabry-Pe/spl acute/rot laser diode. A 32.48-GHz optical clock with low level of timing jitter (0.38 ps) and high extinction ratio (23 dB) was recovered from a 32.48-Gb/s return-to-zero input optical data stream. The impact of the characteristics of the input signal such as the injected optical power and tunability of data rate on the measured radio-frequency power, timing jitter, and extinction ratio of the recovered clock signal has also been investigated.
20 citations
TL;DR: In this paper, a method based on the Pound-Drever-Hall method of laser frequency stabilization was proposed to detect the offset between the CW frequency and the combline frequency desired for injection-locking.
Abstract: A novel method is presented to provide long-term stabilization of an injection-locked harmonically mode-locked laser to a narrow linewidth continuous-wave (CW) source for the first time. The method, based on the Pound-Drever-Hall method of laser frequency stabilization, exploits the phase shift across a laser cavity mode resonance to detect the offset between the CW frequency and the combline frequency desired for injection-locking. Long-term suppression of the radio-frequency supermode noise spurs is shown as well as 36-dB suppression of optical supermodes. Significant reductions in phase and amplitude noise are also shown due to injection. Postamplification noise results are presented, showing an increase in optical power per combline with no degradation in pulse-to-pulse energy fluctuation or timing jitter.
20 citations
TL;DR: A regeneratively mode-locked fiber-optical parametric oscillator that utilizes intracavity dispersion compensation to generate pulses at a 10-GHz repetition rate in both soliton and nonsoliton regimes is demonstrated.
Abstract: We demonstrate a regeneratively mode-locked fiber-optical parametric oscillator that utilizes intracavity dispersion compensation to generate pulses at a 10-GHz repetition rate in both soliton and nonsoliton regimes. At the threshold pump power the generated pulses are close to fundamental solitons. At higher pump powers we found a significant deviation of the pulses from the sech2 shape. In addition, the use of an ultralow-jitter self-starting pump–pulse source in a regenerative feedback loop allows for a significant reduction of the signal’s timing jitter and amplitude noise.
20 citations
02 Jun 2013
TL;DR: In this article, a loop of unidirectionally coupled oscillators to demonstrate high tuning range and output power is proposed, which achieves continuous tuning range of 9.5% at the center frequency of 105GHz with the peak output power of 2.8mW.
Abstract: In this work, a loop of unidirectionally coupled oscillators to demonstrate high tuning range and output power is proposed. To achieve large tuning range, two different tuning mechanisms are simultaneously exploited. First each core oscillator is tuned using a variable capacitor. Next, by controlling the phase/delay between the coupled oscillators, the entire loop dynamics and hence its frequency is tuned. In this paper, we analyze a loop of “n” coupled oscillators using Adler's equation and derive the expression for the maximum tuning range. The proposed system is designed and implemented using four coupled Colpitts VCOs in a 65nm bulk CMOS process. The VCO achieves continuous tuning range of 9.5% at the center frequency of 105GHz with the peak output power of 2.8mW. The circuit consumes 54mW from a 1.2V supply. To the best of our knowledge, this VCO has the highest output power and tuning range among all the CMOS oscillators at or above 100GHz.
20 citations