title: Combination of a spectrometer-on-chip and an array of Young's interferometers for laser spectrum monitoring.
abstract: This Letter presents the design and experimental results for an on-chip photonic device for laser spectrum monitoring that combines a nanospectrometer and an array of Young's interferometers. The array of Young's interferometers and the spectrometer measure the width and wavelength of a spectrum in visible light, respectively. The accuracy of spectral width measurements is around 10% for FWHM higher than 2.5 pm. The spectrometer-on-chip is based on a digital planar hologram, and provides a resolution around 145 pm within the spectral range of 719-861 nm (142 nm bandwidth). The performance of the device is demonstrated for distinguishing between the single- and two-longitudinal mode operation of a fiber Bragg grating laser diode with 23 pm mode separation.
authors.forename: A
authors.initials: A
authors.lastname: Koshelev
authors.forename: G
authors.initials: G
authors.lastname: Calafiore
authors.forename: C
authors.initials: C
authors.lastname: Peroz
authors.forename: S
authors.initials: S
authors.lastname: Dhuey
authors.forename: S
authors.initials: S
authors.lastname: Cabrini
authors.forename: P
authors.initials: P
authors.lastname: Sasorov
authors.forename: A
authors.initials: A
authors.lastname: Goltsov
authors.forename: V
authors.initials: V
authors.lastname: Yankov