| 摘要 |
A hollow core multi-mode interference (MMI) device is described that comprises a multi-mode waveguide ( 10, 14 ) optically coupled to at least two fundamental mode waveguides ( 8, 12, 16 ). The device is characterised in that it comprises a means for varying the internal cross-sectional dimensions of a portion of one or more of said at least two fundamental mode waveguides. In particular, the side wall of a fundamental mode waveguide having a substantially square cross-section can be moved using micro-electro mechanical systems (MEMS). Various optical routing devices incorporating such MMI devices are described.
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