Laser wavelength metrology with low-finesse etalons and Bayer filters

We propose and demonstrate an integrated wavemeter capable of accurate and broadband measurements without control or knowledge of the temperature. In our design, interferometers composed of silicon and silicon nitride waveguides enable accurate measurements of an input optical wavelength despite large and rapid temperature fluctuations of 20°C by leveraging the disparity in thermo-optic properties of the waveguides. We derive formulas which resolve the wavelength and temperature ambiguity of the interferometers. The fabricated wavemeter chip is found to have a mean accuracy of 11 pm over an 80 nm range near 1550 nm. To our knowledge, this is the first demonstration of an athermal silicon wavemeter and the lowest measurement error across such a broad wavelength range using silicon photonics. This result may reduce the cost and size of wavemeters used in combination with integrated lasers for optical communications, sensing, and other applications.

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Athermal silicon photonic wavemeter for broadband and high-accuracy wavelength measurements

Stern

Kim

Gariah

et al. 2021

Opt. Express

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Million-Q integrated Fabry-Perot cavity using ultralow-loss multimode retroreflectors

Qin

et al. 2022

Photon. Res.

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The monolithic integration of Fabry-Perot cavities has many applications, such as label-free sensing, high-finesse filters, semiconductor lasers, and frequency comb generation. However, the excess loss of integrated reflectors makes it challenging to realize integrated Fabry-Perot cavities working in the ultrahigh- Q regime ( > 10 6 ). Here, we propose and experimentally demonstrate what we believe is the first silicon integrated million- Q Fabry-Perot cavity. Inspired by free-space optics, a novel monolithically integrated retroreflector is utilized to obtain near-unity reflectance and negligible reflection losses. The corner scattering in the retroreflector is prevented by the use of the TE 1 mode, taking advantage of its zero central field intensity. Losses incurred by other mechanisms are also meticulously engineered. The measurement results show resonances with an ultrahigh intrinsic Q factor of ≈ 3.4 × 10 6 spanning an 80-nm bandwidth. The measured loaded Q factor is ≈ 2.1 × 10 6 . Ultralow reflection losses ( ≈ 0.05 dB ) and propagation losses ( ≈ 0.18 dB/ cm ) are experimentally realized.

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Laser wavelength metrology with low-finesse etalons and Bayer filters

Cited by 2 publications

References 28 publications

Athermal silicon photonic wavemeter for broadband and high-accuracy wavelength measurements

Athermal silicon photonic wavemeter for broadband and high-accuracy wavelength measurements

Million-Q integrated Fabry-Perot cavity using ultralow-loss multimode retroreflectors

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