25 August 2008 Broad tuning range filtering system with Optune interferometers
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An optical system built with two Optune interferometers cascaded according to Vernier principle has attractive tunable band pass filtering properties for numerous applications. Several characteristics of Optune interferometer such as 0.2 dB insertion loss flatness across at least 90 nm interval, no tuning holes across 240 nm tuning range, quasi-periodic free spectral range and 1 dB insertion loss are key parameters to obtain a cascade with 0.1 nm band pass tunable across minimum 90 nm. Several properties of Optune interferometers are analyzed to build a cascade tunable across minimum 90 nm: the relationships between the free spectral ranges, bandwidths and tuning conditions. It is presented also a cascade prototype with two interferometers having 9.72 nm free spectral range and respectively 11.12 nm free spectral range. The cascade band pass is 0.1 nm tunable with 1 pm accuracy to any arbitrary wavelength across 150 nm free spectral range, without any tuning hole. It has 0.125 ms / 100 nm tuning speed, the insertion loss is less than 3 dB, 50 dB contrast, 0.5 dB flatness and 0.2 dB polarization dependent loss. A controller based on digital signal processor monitors the operation of the cascade to achieve optimum tuning performance.
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Nicolae Miron, Nicolae Miron, } "Broad tuning range filtering system with Optune interferometers", Proc. SPIE 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II, 70561I (25 August 2008); doi: 10.1117/12.802216; https://doi.org/10.1117/12.802216

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