title: Narrow-bandpass filter with gain by use of twin-core rare-earth-doped fiber.
abstract: We demonstrate both numerically and experimentally that rare-earth-doped twin-core fiber couplers can function as a narrow-bandpass wavelength filter or as a demultiplexer. The experimental bandwidth obtained is 6.5 nm. In addition, the filtered signal experiences a gain of 20 dB instead of attenuation.
authors.forename: B
authors.initials: B
authors.lastname: Wu
authors.forename: P L
authors.initials: PL
authors.lastname: Chu