Patent ID: 7039260
Filing Date: 2006-05-02
Classification: G02B,H04B

Abstract:
1. An optical pulse train generator comprising: an optical pulse source for generating a source optical pulse train having a predetermined pulse period; a λ4-phase-shifted grating including a first and a second uniform pitch gratings having substantially identical Bragg wavelength and a λ4-phase-shift section, said first and second uniform pitch gratings being coupled via said λ4-phase-shift section; and an optical waveguide provided along a longitudinal direction of said λ4-phase-shifted grating so as to constitute a λ4-phase shifted grating waveguide for receiving said source optical pulse train from one end of said λ4-phase-shifted grating waveguide and guiding a reflected optical pulse train to be output from said one end of λ4-phase-shifted grating waveguide, so that the pulses of the reflected optical pulse train alternate in phase by π.