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We describe a silicon integrated photonic interrogator with on-chip wavelength and temperature referencing for absolute measurements. We demonstrate fiber Bragg grating interrogation with ±1oC temperature accuracy without thermo-electric coolers.

Fiber Bragg gratings are reported that are optimized for low wavelength drift, making them suitable for high- accuracy temperature measurements over extended periods of time. Our gratings show drift in the order of a few 10's of pm over 1,300 h at up to 650°C.

There is growing interest in sensor technology that is immune to electro-magnetic interference. By nature, development of this technology covers multiple physical domains including electronics, optics, mechanics and materials. This paper discusses development of a mathematical model to compensate for the hysteresis and viscoelastic effects of a piezo-optic voltage sensor. The sensor utilizes piezoelectric fibers with interdigitated electrodes coupled to an optical wave guide via a dielectric matrix. The unknown voltage energizes the piezoelectric fibers to deform fiber Bragg gratings (FBGs) on the waveguide. Therefore, a measurable change in wavelength is related to the unknown voltage. The hysteresis model is based on Rayleigh’s Law of magnetization that is adapted for the coupled piezoelectric and optic response, and the viscoelastic model is based on the standard linear solid model using springs and dashpots in combination. Model results compare favorably with experimental results.

Replacing coax bundles in magnetic resonance imaging systems with fiber eliminates many problems such as crosstalk, ground loops, EMI, and safety hazards. An analog photonic link has been demonstrated with excellent image quality.

A system and method for optical transmission of ultrasound data signals from a probe to an image processing system is provided. By using a silicon-based optical modulator to encode ultrasound data signals onto an optical signal, an optical transmission link between the ultrasound probe and the image processing system can achieve a high signal to noise ratio with a lower power input.