Abstract
We demonstrate a novel method for low-loss splicing photonic crystal fibers
(PCFs) and double cladding fibers (DCFs) by controlled hole collapse and tapering using
a conventional fusion splicer. Through controlled hole collapse, two center rings of
holes were collapsed to expand the core of the PCF, while the cladding diameter of the
PCF was almostly not changed. The mode field diameter (MFD) and inner cladding diameter
of the DCFs were decreased by tapering. So an optimum mode field and cladding match at
the interface of PCF-DCF and an adiabatic mode field variation in the longitudinal
direction of the PCF and DCF can be achieved. This is the first time, to our knowledge,
to realize low-loss splicing between the DCFs and PCFs. Splice losses as low as 0.65 dB
were achieved between a PCF and a DCF with MFDs of 5.8 and 26.5 μm, and with the
inner cladding diameters of 125 and 250 μm, respectively.
© 2011 IEEE
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