Optical generation of a precise microwave frequency comb by harmonic frequency locking
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Abstract:
A semiconductor laser under negative optoelectronic feedback is applied to the generation of a microwave frequency comb through the nonlinear dynamics. The laser system is operated in a harmonic frequency-locked pulsing state, where its power spectrum is a microwave frequency comb that consists of multiples of a locking frequency. Every frequency component of the comb can be simultaneously stabilized by simply injecting an external microwave modulation at any component of the comb. This phenomenon can be viewed as a kind of microwave injection locking of the laser dynamics.Keywords:
Comb generator
Injection locking
Mode-Locking
Harmonic
Frequency multiplier
Optical frequency comb
In this paper, we present an experimental study of the metrological stabilization of a solid-state frequency comb for embedded metrology applications. The comb is a passively mode-locked laser diode based on InGaAs/InP Quantum-dash structure emitting optical lines into a 9 nm bandwidth centered at 1.55 $\mu$m with a repetition rate of 10.09 GHz. The frequency stabilization is achieved by optical injection locking of the comb with an external cavity laser diode referenced onto a metrological frequency standard. One observes the transfer of the spectral purity from the injection laser to the neighbouring modes of the injected one as well as the transfer of stability to the adjacent modes. The measurement of the long term stability highlights a frequency noise with random walk behavior specific of the passive mode locking process. Demonstration of sidebands of the injection laser at the repetition frequency of the comb also makes it possible to propose a transfer mechanism and to consider a complete stabilization of the frequency comb at a metrological stability level.
Comb generator
Injection locking
Mode-Locking
Laser diode
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A mm-Wave frequency comb with 240GHz spacing is synchronized to a MLL-PIC using harmonic injection locking, this represent optical frequency division of 24x. The Allan Deviation on the repetition rate stability is 10 -10 at 1s.
Injection locking
Harmonic
Frequency deviation
Comb generator
Mode-Locking
Phase locking
Allan variance
Repetition (rhetorical device)
Harmonic Analysis
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In this paper, we propose a low-cost optical frequency comb generator based on injected directly modulated distributed feedback semiconductor laser. The comb lines can be tuned by changing injection ratio, detuning frequency and polarization state of the injected signal. The experimentally generated 10 spectral lines have a flatness of 1.5 dB. To generate more spectral lines, three approaches are investigated. By adding phase modulator, 14 spectral lines within 1.8 dB power variation can be achieved.
Comb generator
Flatness (cosmology)
Optical frequency comb
Injection locking
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CW injection locking of mode-locked semiconductor lasers has been experimentally demonstrated. The phases of the mode-locked frequency comb are shown to be coherent with that of the master CW laser. The pulsewidth of the mode-locked laser remains almost unchanged (<2 ps) for a broad range of injection power (-28 to -12 dBm). Pulling of the entire mode-locked frequency comb by 400 MHz has been demonstrated. The coherent multifrequency source can be used as a local oscillator comb for coherent optical channelizers for ultrawide-band RF signals.
Injection locking
Mode-Locking
Comb generator
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Citations (33)
A semiconductor laser under negative optoelectronic feedback is applied to the generation of a microwave frequency comb through the nonlinear dynamics. The laser system is operated in a harmonic frequency-locked pulsing state, where its power spectrum is a microwave frequency comb that consists of multiples of a locking frequency. Every frequency component of the comb can be simultaneously stabilized by simply injecting an external microwave modulation at any component of the comb. This phenomenon can be viewed as a kind of microwave injection locking of the laser dynamics.
Comb generator
Injection locking
Mode-Locking
Harmonic
Frequency multiplier
Optical frequency comb
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Citations (57)
We demonstrate optical frequency comb generation using an optical I-Q modulator. By adopting the modulation scheme such as double-sideband suppressed-carrier modulation, frequency spacing of the generated comb has broadened to 20 GHz, corresponding to double of driving RF signal frequency.
Optical frequency comb
Modulation (music)
Frequency multiplier
Comb generator
SIGNAL (programming language)
Compatible sideband transmission
Frequency deviation
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We experimentally demonstrate the simultaneous injection locking of pairs of high-power broad-area laser diodes in a 19-laser array driven by a common current source. Each pair is injection locked by use of a single-mode low-power semiconductor laser. The frequency and phase locking are verified by the optical spectrum and the interference pattern between the injection-locked lasers. The influence of frequency detuning on the (simultaneous) injection behavior has been experimentally clarified. We validate a necessary condition for the injection locking of a broad-area laser array.
Injection locking
Mode-Locking
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Inter-mode beat frequency tuning of a quantum dash comb laser by electrical injection locking is presented. Frequency-modulated comb generation at 6350 cm - 1 (1575 nm, telecom L-band) is confirmed by beat note spectroscopy. A 1.8 MHz wide beat frequency tuning range, injection power and injection frequency dependent beat frequency locking are sup-ported by a coupled oscillator model extended with a noise term.
Injection locking
Comb generator
Beat (acoustics)
Mode-Locking
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We generate a frequency comb via laser electro-optic modulation. Nonlinear spectral broadening increases the 4nm bandwidth to 1150nm. With this comb, we demonstrate frequency measurements across 140 THz and detection of the comb's offset frequency.
Optical frequency comb
Comb generator
Frequency multiplier
Modulation (music)
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We demonstrate experimentally two regimes of coherent injection locking of a Kerr frequency comb to another counter-propagating modulated laser. In disjoint regions, the microcomb locks to either an optical harmonic or the external modulation signal.
Injection locking
Mode-Locking
Optical frequency comb
Modulation (music)
SIGNAL (programming language)
Harmonic
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