Patent ID: 7680372

Claim:
A resonator sensing device comprising: a photonic bandgap resonator fiber having a first end and a second end; a graded index (GRIN) lens; at least one microlens; and at least one source fiber, wherein the GRIN lens includes two surfaces angled to allow light emanated from the at least one source fiber via the at least one microlens to reflect from a first surface of the GRIN lens into the first end of the resonator fiber, to allow a portion of light emanated from the second end of the resonator fiber to pass through the GRIN lens and be received by the first end of the resonator fiber, and to allow a portion of the light emanated from the second end of the resonator fiber to be reflected, as at least one sensing light signal, from a second surface of the GRIN lens into the at least one source fiber via the at least one microlens.