A small silicon mode (de)multiplexer with cascaded asymmetrical directional couplers is demonstrated experimentally. As an example, a four channel mode (de)multiplexer is designed and realized for TM polarization. The fabricated mode (de)multiplexer has a low excess loss () as well as low crosstalk () over a broad wavelength range (). More channels can be achieved with two sets of orthogonal-polarization modes (e.g., ) multiplexed when desired.
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