SPECTRAL CHARACTERIZATION OF FIBER GRATINGS WITH HIGH-RESOLUTION

We demonstrate a high-resolution technique to measure the optical magn itude and phase responses of fiber gratings. The technique employs sin gle-sideband modulation of an optical source and has spectral resoluti on in the hertz regime. The technique is demonstrated by measurement o f the phase ripples of unapodized and apodized chirped gratings as wel l as the transmission spectrum of a pi-phase-shifted grating. Although it is demonstrated on fiber gratings, the technique is applicable to any optical device. (C) 1998 Optical Society of America.