Abstract: A method and system for measuring physical parameters using sensors of the birefringent Fiber Bragg Grating type is provided. In some embodiments, a method and a system for querying a sensor of the birefringent Fiber Bragg Grating (FBG) type (e.g., in birefringent fiber), employing heterodyne optical detection and integrated photonic technology is provided.

Abstract: A method for interrogating an FBG sensor includes lighting the FBG sensor with a broadband excitation optical radiation, conveying the optical spectrum transmitted or reflected by the FBG sensor to a tunable optical BPF having a first extraction port and a second transmission port, tuning the optical BPF at a constant operating wavelength, depending on nominal operating wavelength of the FBG sensor, detecting a first optical signal exiting the first extraction port, converting, by a first opto-electronic receiver, the first optical signal into a first electrical signal, representative of a wavelength shift of the spectrum transmitted or reflected by the FBG sensor, detecting a second optical signal exiting the second transmission port, converting the second optical signal, by a second opto-electronic receiver, into a second electrical signal, representative of an optical reference power, and determining the wavelength shift of the spectrum transmitted or reflected by FBG sensor, based on detected first and se

Abstract: A method for measuring a distributed physical value of an optical device under test (DUT), includes the steps of: launching into the DUT a probe signal that includes a plurality of optical pulses at at least one test wavelength, and receiving at least one optical signal backscattered by the DUT, wherein the optical pulses are obtained with at least the following steps: generating a first time sequence of first pulses that corresponds to a word of a first code, the first time sequence lasting not shorter than a time of flight and being formed by a number of time slots that is equal to the number of bits of the word of the first code; generating a second time sequence of second pulses that corresponds to a word of a second code; and amplitude modulating the second time sequence with the first time sequence.

Abstract: A method for measuring a distributed physical value of an optical device under test (DUT), includes the steps of: launching into the DUT a probe signal that includes a plurality of optical pulses at at least one test wavelength, and receiving at least one optical signal backscattered by the DUT, wherein the optical pulses are obtained with at least the following steps: generating a first time sequence of first pulses that corresponds to a word of a first code, the first time sequence lasting not shorter than a time of flight and being formed by a number of time slots that is equal to the number of bits of the word of the first code; generating a second time sequence of second pulses that corresponds to a word of a second code; and amplitude modulating the second time sequence with the first time sequence.

Abstract: A Raman amplifier structure (121, 221) for optically amplifying an input optical signal comprises an optical means (22) through which the optical signal is propagated, a first pump optical source (10) for generating a first pump radiation and at least one second pump optical source (24, 27) for generating a second pump radiation. The first and second pump optical radiations are combined and propagated in optical transmission means (22) for supplying an optical amplification of the signal through the Raman effect. The first pump optical source (10) comprises a first laser source (12) for generating a radiation with relatively low noise and relatively low power and a Raman amplifier (13) for amplifying the radiation coming from the first laser source for generating the first pump radiation.