Abstract
We demonstrate a mode demultiplexer with two cascaded few-mode polymer waveguide directional couplers fabricated on the same substrate along the horizontal and vertical directions, respectively. The three waveguides that form the two couplers have the same core size. The horizontal and vertical couplers are designed to provide complete power transfer for the and modes, with the mode staying in the central core that incorporates a biconical taper to suppress any remaining modes. A typical fabricated demultiplexer, which is 18.5 mm long, shows a coupling ratio higher than in the wavelength range of 1530–1570 nm for both couplers. The device shows negligible crosstalk to the -mode channel, while the crosstalks to the -mode channels are lower than and for the TE and TM polarizations, respectively. The device can be considered polarization insensitive. The propagation losses for the three modes are about . This device could find applications in mode-division-multiplexing systems.
© 2015 Optical Society of America
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