Photosensitisation of silica planar lightwave interleaver for phase error correction

Photosensitisation of silica planar lightwave interleaver for phase error correction

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Photosensitivity locking with a 248 nm KrF laser was applied to a hydrogen-soaked silica planar waveguide to improve the refractive index response for post-laser phase trimming of an interleaver. A more than tenfold photosensitivity enhancement was stabilised by annealing the interleaver circuit at 150°C for 24 h. The interleaver channel isolation was improved from 6 to 18 dB by balancing the interferometer phase errors with a modest KrF laser dose.


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