Dual-wavelength light source

Abstract

A dual-wavelength light source includes a laser cavity and a tunable intra-cavity optical filter. The intra-cavity optical filter is implementable as an integrated photonic circuit and includes two serially coupled dual-ring resonators of different ring lengths. Each dual-ring resonator has a comb-like transmission spectrum including a sequence of tunable dual-peak transmission subbands. In operation, different dual-peak transmission subbands of the respective dual-ring resonators may be aligned using optical phase shifters to provide a tunable dual-peak passband of the inter-cavity optical filter. The peak-to-peak separation of the passband may be tuned by tuning optical coupling between the rings of the respective dual-ring resonator.

Dependencies are inferred from the claim text.