Open AccessPhotonic-crystal diplexers for terahertz-wave applications
Author(s) -
Masahiro Yata,
Masayuki Fujita,
Tadao Nagatsuma
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.007835
Subject(s) - diplexer , terahertz radiation , optics , photonic crystal , bandwidth (computing) , wavelength , optoelectronics , photonics , photonic integrated circuit , materials science , terahertz spectroscopy and technology , physics , telecommunications , computer science
A compact diplexer is designed using a silicon photonic-crystal directional coupler of length comparable to the incident wavelength. The diplexer theoretically and experimentally exhibits a cross state bandwidth as broad as 2% of the operation frequency, with over 40-dB isolation between the cross and bar ports. We also demonstrate 1.5-Gbit/s frequency-division communication in the 0.32- and 0.33-THz bands using a single-wavelength-sized diplexer, and discuss the transmission bandwidth. Our study demonstrates the potential for application of photonic crystals as terahertz-wave integration platforms.