Abstract
A novel 1.31/1.55 $\mu$m wavelength-division demultiplexer based on a three-core photonic
crystal fiber is proposed. The fiber is composed of a large central core and
two up-doped cores with different core sizes. The large core is realized by
the omission of seven airholes and the insertion of a down-doped rod in the
center of fiber. The effective indexes of the two small cores are index matched
with the large core at the wavelength of 1.31 and 1.55 $\mu$m, respectively. Therefore, wavelength
dependent coupling is realized in the three-core optical fiber. Numerical
investigation demonstrates that crosstalk lower than ${-}30$ dB and polarization-dependent
loss lower than 0.1 dB can be realized in one such fiber with a length of
22 mm.
© 2009 IEEE
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