Design issues for tunable filters for optical telecommunications

Lewis, Keith L.; Smith, Graeme C.; Mason, Ian; Rochester, Katie

doi:10.1117/12.461728

Cited by 2 publications

(1 citation statement)

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“…It is also possible to incorporate the liquid crystal as a dispersed phase in a polymer host (n-PDLC, for nano-phase polymer dispersed liquid crystal material) and to use the same cavity design as above, the filling of the cell being replaced by a casting of the precursor mixtures between the two coated glass substrates [20]. The tuning of the cavity is achieved again through a change in the voltage applied on the ITO electrodes, the experimental sensitivity being equivalent to an effective electro-optic constant of 700 pm/V at 1550 nm (to compare to 30 pm/V for the lithium niobate).…”

Section: Active Spacersmentioning

confidence: 98%

Tunable thin film filters: review and perspectives

Lequime

2004

SPIE Proceedings

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The development of tunable filters is a key point for the ability of optical telecommunication networks to comply with the continuous evolution of the service providers needs. Among the numerous technologies which can be used to achieve narrow bandpass filtering devices, we concentrate our analysis on Thin-Film Interference Coatings and compare the principles, performances and use constraints of the various schemes allowing to tune such a thin-film structure : tilt of a standard bandpass filter, translation of a linear variable filter, deformation of the substrate of a DWDM filter, implementation of active spacers with controllable optical thickness (thin-films or solid spaced etalons).

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Section: Active Spacersmentioning

confidence: 98%