Abstract: We report the effect of the unavoidable optical loss on the performance accuracy of a recently proposed photonic chip-based analogue of the relativistic Thomas effect, a well-known phenomenon of special relativity. Our investigations reveal that the optical loss factor of the photonic chip must be ≥ 0.91 so the normalized deviation error is < 1% to cover greater than 95% of its angular operating range.

Abstract: We propose a new coupled waveguide optical resonator (CROW) configuration constructed with cross-coupling structure instead of the typical direct coupling. We also extend the traditional matrix formalism of CROWs to incorporate the new coupling structure. The cross-coupled CROW reveals a novel effect characterized by a main linewidth at normalized frequency φ=0, and two accompanying narrower linewidths, high Q-factor transmitted lines at normalized frequency φ=±π. This effect differs sharply from the coupled-resonator-induced transparency (CRIT) generated with the typical direct coupling-based CROW. We also compare other features of the two CROW types. Lastly, this new effect has application in two-wavelength photonic filtering.