The development of optical amplification and bidirectional traffic in local and wide area networks requires broadband multiplexers which are able to treat the signal of an entire telecommunication window. A device made by ion exchange and answering to these needs is proposed in this letter. Its working principle, based on a leaky structure is first explained. An experimental result confirming a good broadband spectral behavior is then presented. Its spectral response displays two duplexing bands of at least 100 nm.
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