10 January 1996 Dense all-fiber WDM by means of Mach-Zehnder interferometer
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Dense all-fiber WDM's designed for telecommunication network applications around 1550 nm have been made from the all-fiber Mach-Zehnder interferometers' technology. They demonstrate isolation greater than 20 dB and loss smaller than 0.1 dB. Channel spacing of 0.7 nm has been achieved experimentally supporting a 20.5 dB isolation. A cascaded structure made of two interferometers has also been constructed highlighting the ease with which one can arrange several of them in series and thus increase the quantity of channels supported while maintaining high isolation.
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Arnaud Symon, Arnaud Symon, Suzanne Lacroix, Suzanne Lacroix, Jacques Bures, Jacques Bures, } "Dense all-fiber WDM by means of Mach-Zehnder interferometer", Proc. SPIE 2695, Functional Photonic and Fiber Devices, (10 January 1996); doi: 10.1117/12.229936; https://doi.org/10.1117/12.229936

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