Abstract

We present the design of a short broadband fiber directional coupler for terahertz (THz) radiation and demonstrate a $3\mathrm{dB}$ coupler with a bandwidth of $0.6\mathrm{THz}$ centered at $1.4\mathrm{THz}$. The broadband coupling is achieved by mechanically downdoping the cores of a dual-core photonic crystal fiber by microstructuring the cores. This is equivalent to chemical downdoping but is easier to realize experimentally.

© 2010 Optical Society of America

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