| 1. |
- Karunakaran, Anamika Nair, et al.
(author)
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Stable soliton comb from dual ring microresonators
- 2023
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In: 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023.
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Conference paper (peer-reviewed)abstract
- In recent years, frequency combs have raised growing interest thanks to the increasing number of applications, ranging from astronomy[1], to telecommunications[2]. To this regard, microresonator-based frequency combs represent an attractive alternative to mode-locked lasers, due to their larger comb line spacing and lower power threshold. However, the stability of these combs depends on the detuning of the laser with respect to the resonance frequency, input power variation and thermal drift.
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| 2. |
- Skehan, Connor, 1993, et al.
(author)
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Thermorefractive noise reduction of photonic molecule frequency combs using an all-optical servo loop
- 2023
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In: Optics Express. - 1094-4087 .- 1094-4087. ; 31:21, s. 35208-35217
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Journal article (peer-reviewed)abstract
- Phase and frequency noise originating from thermal fluctuations is commonly a limiting factor in integrated photonic cavities. To reduce this noise, one may drive a secondary “servo/cooling” laser into the blue side of a cavity resonance. Temperature fluctuations which shift the resonance will then change the amount of servo/cooling laser power absorbed by the device as the laser moves relatively out of or into the resonance, and thereby effectively compensate for the fluctuation. In this paper, we use a low noise laser to demonstrate this principle for the first time in a frequency comb generated from a normal dispersion photonic molecule micro-resonator. Significantly, this configuration can be used with the servo/cooling laser power above the usual nonlinearity threshold since resonances with normal dispersion are available. We report a 50 % reduction in frequency noise of the comb lines in the frequency range of 10 kHz to 1 MHz and investigate the effect of the secondary servo/cooling noise on the comb.
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| 3. |
- Xing, Liu, et al.
(author)
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Octave-spanning supercontinuum generation in a silicon-rich nitride waveguide
- 2016
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In: Optics Letters. - 0146-9592 .- 1539-4794. ; 41:12, s. 2719-2722
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Journal article (peer-reviewed)abstract
- We experimentally show octave-spanning supercontinuum generation in a nonstoichiometric silicon-rich nitride waveguide when pumped by femtosecond pulses from an erbium fiber laser. The pulse energy and bandwidth are comparable to results achieved in stoichiometric silicon nitride waveguides, but our material platform is simpler to manufacture. We also observe wave-breaking supercontinuum generation by using orthogonal pumping in the same waveguide. Additional analysis reveals that the waveguide height is a powerful tuning parameter for generating mid-infrared dispersive waves while keeping the pump in the telecom band.
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