Method and system for integrated photonic notch filter

Abstract

A spectral filter includes a wavelength demultiplexer having a first output and a second output, a signal channel pump rejection filter coupled to a first output, and a herald channel pump rejection filter coupled to the second output. The spectral filter also includes a first chain of asymmetric Mach-Zehnder interferometers (MZIs) coupled to the signal channel pump rejection filter. Each of the asymmetric MZIs in the first chain of asymmetric MZIs is characterized by a decreasing free spectral range. The spectral filter further includes a second chain of asymmetric MZIs coupled to the herald channel pump rejection filter. In some embodiments, each of the asymmetric MZIs in the second chain of asymmetric MZIs is characterized by a decreasing free spectral range.

Dependencies are inferred from the claim text.