Patent ID: 7155074

Claim:
A pressure transducer having a large diameter optical waveguide with a cross-section of at least about 0.3 millimeters, at least one inner core, a Bragg grating arranged therein, a cladding surrounding the at least one inner core, and a structural configuration for reducing the bulk modulus of compressibility and maintaining the anti-buckling strength of the large diameter optical waveguide, wherein the large diameter optical waveguide responds to an optical signal, further responds to an external pressure that causes a differential strain across the inner core, for providing a Bragg grating optical signal containing information about a birefringence of the Bragg grating that is proportional to the external pressure, wherein the structural configuration forms at least one side hole arranged in relation to the core of the large diameter optical waveguide and dimensioned for maintaining anti-buckling strength of the large diameter optical waveguide.