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Silicon nitride microresonators provide a potentially CMOS-compatible platform for optical frequency comb generation [1]. As in any high-Q microcavity, thermal effects strongly affect the dynamics. This is particularly true considering that typical continuous wave pump powers for microresonator comb generation operate in the 20–35 dBm range. Temporal bright solitons for instance are generated when...
We report on microcombs that achieve ∼30% conversion efficiency (∼200 mW on-chip comb power excluding the pump), with 40 lines between 1513 nm–1586 nm with an average 7 dBm per comb line.
Using delayed self-heterodyne coherent detection, we characterized the FM noise across the C-band of a widely spaced microresonator-based frequency comb. The resulting linewidth depends on both the pump laser and the comb line position.
Microresonator‐based Kerr frequency comb (microcomb) generation can potentially revolutionize a variety of applications ranging from telecommunications to optical frequency synthesis. However, phase‐locked microcombs have generally had low conversion efficiency limited to a few percent. Here we report experimental results that achieve conversion efficiency ( on‐chip comb power excluding...
We use a drop-port geometry to characterize the intracavity waveform of an on-chip microcavity soliton. In contrast to the through-port output, the intracavity field shows efficient power transfer from the pump into the comb.
We demonstrated transmission of polarization-multiplexed quadrature phase-shift keying data over 6000 km using a low-noise silicon nitride microresonator frequency comb as light source. These results show the technology's suitability for long-haul fiber communications.
Carrier-envelope offset frequency tuning of a microcomb over 25 GHz is demonstrated based on the thermo-optic effect (362.07 ± 4.16 MHz/°C). Thermal response time constants of 30.9 μs and 0.71 ms are observed.
We report the fabrication and characterization of SiN resonators with intrinsic Qs up to 17 million verified with cavity ring-down measurement. Frequency comb generation threshold down to 2.36 mW is consistent with theoretical estimation.
A novel method of measuring the hot-cavity detuning with a high precision is proposed. Characterization of a mode-locked comb related to dark cavity pulse formation in the effective blue detuning region is demonstrated.
Bright and dark pulses were observed respectively at the through and drop ports of a normal-dispersion microresonator, illustrating the impact of a superimposed pump on the time-domain waveform of the output microcomb.
Optical frequency comb generation due to interplay between second-order and third-order nonlinearities is demonstrated in a silicon nitride microring resonator which shows normal group velocity dispersion for the fundamental wave. Mode-locked bright and dark pulses are generated at the through and drop ports respectively.
A method incorporating controllable mode interaction is proposed for Kerr frequency comb generation in normal-dispersion microresonators. Repetition-rate-tunable combs and broadband mode-locking transitions are demonstrated by using dual silicon nitride microrings.
We investigate enhanced coupling of the pump laser as a result of power transfer to the frequency comb in a silicon nitride microring designed with an over-coupled bus-waveguide.
SiN micro-resonators with a cross section of 3×0.6 μm2 and an FSR of 25 GHz were demonstrated with intrinsic Qs up to 17 million, showing frequency comb onset power as low as 5.6 mW.
We demonstrate a scheme to broaden the bandwidth of the Kerr frequency comb generated through mode interaction in a silicon nitride microresonator with normal dispersion. The broadened comb has a bandwidth of over 5 THz and can be compressed to the bandwidth limited time profile via dispersive fiber propagation.
Mode-interaction-aided soft excitation of dark solitons in normal dispersion nonlinear microresonators is proved both experimentally and in simulation for the first time, resulting in dark pulse mode-locked broadband Kerr combs.
We investigate several interesting effects related to normal dispersion micro resonator combs, including comb generation behavior affected by mode coupling and mode-locked tunable broadband comb generation.
We demonstrate a novel comb tuning method for microresonator-based Kerr comb generators. Continuously tunable, low-noise, and coherent comb generation is achieved in a CMOS-compatible silicon nitride microring resonator.
The coherence properties of a frequency comb generated by a SiN microring resonator is shown to be changed by the feedback through a self tracking, narrowband single longitudinal mode filter in an active fiber loop.
With feedback and amplification at selected sidebands of a SiN microring spectrum, we achieve controllable line spacing in the generated comb under relaxed pumping conditions. Such reduced pump power requirement is beneficial for many applications.
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