Abstract

A holey optical fiber (HOF) wavelength division multiplexing (WDM) coupler, which divides optical waves according to their wavelengths, has been made by using the Fused Biconical Tapered (FBT) method. The transmission band of the proposing HOF WDM coupler could be easily tuned by adjusting the pulling length during the FBT process. The HOF used for the WDM coupler was designed to be bending insensitive, which could withstand a bending radius of up to 6 mm. Interestingly, it was observed that the air hole structure of the HOF should be maintained to have the property of a WDM coupler. The cross sectional SEM images of the implemented HOF WDM coupler are presented along with the light intensity distribution at the coupling region. The proposed HOF couplers may find applications as optical CWDM (coarse wavelength division multiplexing) filters and as optical fiber sensors also.

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