Patent ID: 8983250
Filing Date: 2015-03-17
Classification: G01J,G02B,H04J

Abstract:
1. A wavelength interrogator having: an optical fiber having a plurality of gratings sequentially disposed on the optical fiber, each said grating forming a sensor and having a unique reflective optical response; a circulator having a sensor port coupled to said optical fiber, said circulator also having a broadband source port and an AWG port; a broadband source coupled to said circulator broadband source port, said circulator coupling optical energy from said broadband source to said optical fiber, reflected optical energy from each said grating directed through said circulator to said AWG port; an AWG coupled to said circulator AWG port, said AWG having a plurality of channels, each said channel coupled to a detector; whereby each said sensor provides reflected wavelength to an adjacent pair of said AWG channels, each said pair of AWG channels only receiving optical energy from a particular sensor; and where the detectors of said adjacent pair of said AWG channels generate a complementary response in the associated pair of detectors, thereby resolving said complementary response to a wavelength, at least one said sensor reflecting said broadband optical energy into an aliased AWG channel.