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Photonic Devices - Bragg gratings

Photonic Devices - Bragg gratings. Peak shifts with temperature and / or strain. Reflectivity (%). Theory. Experiment.

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Photonic Devices - Bragg gratings

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  1. Photonic Devices - Bragg gratings Peak shifts with temperature and / or strain Reflectivity (%) Theory Experiment This graph shows typical experimental & theoretical Grating reflection spectra. The peak wavelength is sensitive to changes in temperature (0.01nm/ degree C) as well as changes in strain (0.001 nm if the fibre stretches by 1 part in 106), making Bragg gratings useful in fibre sensors.

  2. Special fibres for special applications Current sensing on HV powerlines Erbium-doped fibre amplifier for all-optical repeaters in long haul communication links Optical fibre wound around conductor can safely sense magnetic fields “Non-zero dispersion-shifted fibre” for long haul high bit rate links

  3. Planar optical waveguides Planar waveguides written into a polymer on a silicon wafer using a focused laser Microscope photo of a planar waveguide device

  4. Planar Optical Waveguides • Planar waveguides can also be built up layer by layer, as has been done for silicon chips Sequence of processing steps: • Cladding deposition • Core deposition • Masking • Etching • Cladding deposition This allows quite complex waveguide structures to be fabricated over a large area in a short time Microscope photo of a buried channel waveguide showing the ~ 6 micron core (bright) against a darker cladding

  5. Microphotonics - a new frontier Micro-electro-mechanical systems (MEMS) In recent years, new kinds of moving objects such as tiny motors, pumps and moving mirrors have been fabricated on micrometer scales. This tiny electronically tiltable mirror is a building block in devices such as all-optical cross-connects and new types of computer data projectors. MEMS array configured as an optical crossconnect

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