Abstract: A full 3R (re-timing, re-shaping, re-amplifying) recovery system is provided. In the full 3R recovery system, a self-pulsating laser diode (SP-LD) and an electroabsorption modulator (EAM) are integrated and disposed on a semiconductor substrate.

Abstract: Provided is a system for all-optical clock recovery that can reduce a pattern effect and timing jitter of an optical clock. The system includes an optical signal controller that controls the magnitude and polarization state of an optical signal, a laser unit that receives the optical signal output from the optical signal controller and outputs an optical clock, and an optical regeneration loop that controls the phase, polarization, and magnitude of the optical clock output from the laser unit so as to provide the laser unit with the optical clock, the phase, polarization, and magnitude of which are controlled, and the optical signal output from the optical signal controller.

Abstract: A light source has a structure in which a 3-dB beam splitter is integrated with a Febry-Perot laser diode having a cleaved plane. A first waveguide grating and a first refractive index modifier changing a Bragg wavelength of the first waveguide grating are provided at one branch of the 3-dB beam splitter. A second waveguide grating and a second refractive index modifier changing a Bragg wavelength of the second waveguide grating are provided at another branch of the 3-dB beam splitter.