Abstract

We experimentally demonstrate a new wavelength- and mode-selective coupler utilizing intermodal coupling between a standard single-mode fiber (SMF) and a hollow optical fiber (HOF). The fabricated device routes optical signals such that a $1.3‐\mathit{\mu }\mathrm{m}$ signal is directed to the HOF port, adiabatically converting the ${\mathrm{LP}}_{01}$ mode into a ring-shaped mode, which can be further connected to a gigabit ethernet link, reducing the differential mode-dispersion penalty. Optical signals near $1.5 \mathit{\mu }\mathrm{m}$, meanwhile, stay in the ${\mathrm{LP}}_{01}$ mode of the SMF arm for further connection to conventional wavelength-division multiplexing links based on erbium-doped fiber amplifiers. The performance of the device is characterized in terms of insertion loss, channel isolation, and mode-conversion efficiency.

© 2002 Optical Society of America

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