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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33 citations
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TL;DR: In this paper, a single quantum-dash passively mode-locked laser (QD-MLL) is combined with an arrayed waveguide grating in WDM-PON architecture to provide a low-noise, coherent multiwavelength seeding source to injection-lock the FP-LDs for both downstream and upstream.
Abstract: We experimentally investigate the operation of a cost-effective wavelength-division-multiplexed passive optical network (WDM-PON) based on wavelength-locked Fabry-Perot laser diodes (FP-LDs). A single quantum-dash passively mode-locked laser (QD-MLL) is combined with an arrayed waveguide grating in WDM-PON architecture to provide a low-noise, coherent multiwavelength seeding source to injection-lock the FP-LDs for both downstream and upstream. The results show that the QD-MLL-injected FP-LD has the same performance when compared to the case of injection-locking by a low-noise external cavity laser. Error-free bidirectional transmission over 25 km for 16 channels with 42.7-GHz channel spacing is demonstrated at 2.5 Gb/s in the C -band and an optical budget higher than 30 dB is reached.
33 citations
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27 Oct 2003TL;DR: In this article, the first direct RIN measurement of an injection-locked laser for different injection conditions was reported, and a record 3/sup rd/ harmonic SFDR of 111 dB-Hz/sup 2/3/ at 2 GHz was also demonstrated for a directly modulated VCSEL with this technique.
Abstract: Optical injection locking has been demonstrated to increase the laser bandwidth and reduce the laser chirp and distortion. In this paper, we report the first direct RIN measurement of an injection-locked laser for different injection conditions. A record 3/sup rd/ harmonic SFDR of 111 dB-Hz/sup 2/3/ at 2 GHz was also demonstrated for a directly modulated VCSEL with this technique. To conclude, the RIN spectra of an injection-locked VCSEL were studied for different injection conditions. More than 10 dB reduction of the RIN can be obtained at the free-running resonance frequency. A record SFDR value at 2 GHz was also reported using the injection locking technique.
33 citations
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TL;DR: In this paper, a new method and circuit for the conversion of binary phase-shift keying (BPSK) signals into amplitude shift keying signals is presented. But the conversion method is based on superharmonic injection and locking of oscillator circuits, and interference phenomena.
Abstract: This paper presents a new method and circuit for the conversion of binary phase-shift keying (BPSK) signals into amplitude shift keying signals. The basic principles of the conversion method are the superharmonic injection and locking of oscillator circuits, and interference phenomena. The first one is used to synchronize the oscillators, while the second is used to generate an amplitude interference pattern that reproduces the original phase modulation. When combined with an envelope detector, the proposed converter circuit allows the coherent demodulation of BPSK signals without need of any explicit carrier recovery system. The time response of the converter circuit to phase changes of the input signal, as well as the conversion limits, are discussed in detail.
33 citations
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TL;DR: A simple method for measuring the linewidth enhancement factor alpha of a semiconductor laser by optical injection locking is described and the value of alpha is evaluated from only changes in optical power in the stable optical injection-locking state.
Abstract: A simple method for measuring the linewidth enhancement factor α of a semiconductor laser by optical injection locking is described. Without knowledge of the absolute values of detuning and the optical injection level, the value of α is evaluated from only changes in optical power in the stable optical injection-locking state. The value of α of a 0.83-μm channeled substrate planar laser is evaluated to be 2.65 ± 0.2. The measurement error of this method is also discussed.
33 citations