| 摘要 |
<p>The invention concerns tunable wavelength-selective optical filters, allowing through a narrow optical spectral band light, centered around an adjustable wavelength, and preventing the passage of wavelengths outside said band. The component comprises in a micro-machined monolithic structure including the optical filter proper (M1, M2, C), a low-absorption light sensing element (70, 72, 74, 76, 42) for automatically controlling the filter tuning on a wavelength received by the filter, said element allowing through the major part of the radiation at said wavelength. The filter is a Fabry-Perot interferometric filter whereof the cavity (C) is tuned on the value which maximizes the power detected by the light sensing element. The filter is preferably based on indium phosphide layers and air gaps. The sensing element preferably comprises a gallium-indium 74 arsenide layer adapted to the detection of the desired wavelength band. The invention is applicable to optical fiber telecommunications.</p> |
