Demultiplexer for optical orthogonal frequency-division multiplexing using an optical fast-Fourier-transform circuit.
An integrated-optic device for demultiplexing optical orthogonal frequency-division-multiplexed signals is described that consists of an optical fast-Fourier-transform circuit and optical gates. The fast-Fourier-transform circuit is composed of symmetrical Mach-Zehnder interferometers that are suitable for precisely adjusting filter characteristics. This device can process four or more channels with a relatively simple configuration and reduced size. An optical demultiplexer for four subcarrier channels is realized and used to demultiplex 4 x 10 Gbit/s signals.
Takiguchi
K
K
NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198 Japan. taki@aecl.ntt.co.jp
Oguma
M
M
Shibata
T
T
Takahashi
H
H