A pressure transducer has a cane waveguide geometry with “side-holes” in the cane waveguide cross-section that reduce the force required to compress the waveguide. The cane waveguide is a large diameter optical waveguide with a cross-section of at least about 0.3 millimeters, at least one inner core,...http://www.google.com.au/patents/US7155074?utm_source=gb-gplus-sharePatent US7155074 - Pressure transducer featuring large diameter optical waveguide having bragg grating and being configured for reducing the bulk modulus of compressibility thereof
