| 摘要 |
A switching apparatus provides 1x2 and 2x2 switching functions having significantly reduced crosstalk levels using an imaging arrangement of three arms combined with two star couplers. In another 1x2 switching element embodiment, the input star coupler is replaced with an optical signal splitter. Application of the 1x2 and 2x2 switching elements include the realization of a variety of dilated NxN broadband switches with negligible crosstalk over very wide wavelength stopband characterized by two or more equally spaced zeros. The very wide crosstalk stopband enables the NxN broadband switch to switch a broadband wavelength division multiplexed input signal to the desired output port with very low crosstalk at the other output ports.
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