AWG based wavelength-meter with pm resolution

This work reports an integrated circuit for the measurement of the wavelength of a coherent light source. The circuit is based on a 1x8 AWG with a 50 nm Free Spectral Range, connected to an array of photo detectors. A change in wavelength can be monitored by evaluation of the photocurrent variation in detectors connected to two adjacent AWG channels. We demonstrate first characterization results obtained from a demonstrator circuit fabricated in a generic foundry process.