Gwangju Institute of Science and Technology

Kwangju Institute of Science and Technology

Swook Hann

Tae-young Kim

Chang-soo Park

Chang Soo Park

Won-Taek Han

Masanori Hanawa

Sun-Jong Kim

An optical DPSK signal demodulator includes a signal separator that separates an optical signal into an input optical signal and an output optical signal in a signal optical path. First and second reflectors are provided at a predetermined interval and reflect the optical signals with a predetermined time delay to have substantially the same intensity. A phase shifter is provided between the first and second reflectors and configured to allow the optical signals reflected from the first and second reflectors to have a phase difference.

Phase controllable optical delay interferometer, optical differential phase shift keying demodulator using the same, and demodulating method therefor

A wavelength division multiplexed-passive optical network includes an optical line terminal for generating downstream optical signals of discrete wavelengths and for receiving upstream optical signals of discrete wavelengths, a remote node, coupled to the optical line terminal, a wavelength division unit settled to reflect a predetermined wavelength, and a plurality of optical network units. Each optical network unit has an optical source which is oscillated in a multi-mode and is self-injection locked by the predetermined wavelength provided thereto, thereby to generate the upstream optical signal in a single mode to be provided to the remote node.

WDM-PON having optical source of self-injection locked fabry-perot laser diode

Growing community of inventors

Gwangju, South Korea

Swook Hann