Abstract
The effect of axial variations in acoustooptic phase-mismatch coefficient of a two-mode birefringent photonic crystal fiber (PCF) is studied experimentally using two different methods. The first method is to determine axial non-uniformities directly from the transmission spectrum, while the second method is to use acoustic pulses. Both methods are seen to be in good agreement. It is found that axial non-uniformities increase the coupling bandwidth significantly as compared to an axially uniform fiber. The effect of acoustic birefringence is also considered.
Highlights
Acoustooptic (AO) coupling in optical fibers has been applied to the design of many devices, such as tunable filters [1]
There exists a new class of optical fibers, called photonic crystal fibers [11, 12], which offer a large degree of freedom in tailoring fiber parameters
A 48 cm section, denoted section 1, of the photonic crystal fiber (PCF) was stripped to allow for propagation of the acoustic wave
Summary
Acoustooptic (AO) coupling in optical fibers has been applied to the design of many devices, such as tunable filters [1]. The four nearly degenerate higher order modes are reduced to two pairs of linearly polarized second order modes with stable lobe orientations in birefringent fibers [15, 16]. This enables selective excitation of the higher order modes and avoids the problem of coupling to several nearly degenerate modes
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