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We propose a multi-layered, 2D optical phased array capable of 180°× 180° beam steering range without wavelength tuning. Evanescent coupling between half-wavelength spaced waveguides is suppressed below –20 dB through index-mismatch and extreme skin-depth metamaterial waveguides.

We experimentally demonstrate phase retrieval of a single-soliton Kerr comb using electric field cross-correlation implemented via dual-comb interferometry. The phase profile of the Kerr comb is acquired through the heterodyne beat between the Kerr comb and a reference electro-optical comb with a pre-characterized phase profile. The soliton Kerr comb has a nearly flat phase profile, and the pump line is observed to show a phase offset which depends on the pumping parameters. The experimental results are in agreement with numerical simulations. Our all-linear approach enables rapid measurements (3.2 $\mu$s) with low input power (20 $\mu$W).

A TE 0 block TE 1 pass filter is proposed and experimentally demonstrated on SOI platform over C band. The filter suffers negligible reflection and is theoretically immune to phase dependent spectral fluctuation under dual-modes concurrent input.

We demonstrate all-linear phase retrieval of a single-soliton Kerr comb via dual-comb electric field cross-correlation (EFXC). This approach greatly lowers the power needed for ultrafast waveform reconstruction of optical frequency combs.

We report on a compact passive mode-locked Er:fiber ring laser operated at the fundamental repetition rate of 517 MHz, which we believe is the highest fundamental repetition rate ever reported in a ring cavity fiber laser. The key technique is the employment of two innovative high-power wavelength domain multiplexer collimators with all gain fiber cavity suited for the high power (up to 2 W) pumping. The laser is featured with a direct chirp-free output pulse, which is 97 fs without extracavity compression at an average output power of 90 mW.