A sensor system comprising: an optical fiber; and a set of wavelength shift sensors inscribed on the optical fiber, the set comprising: at least one first wavelength shift sensor configured to reflect a first wavelength band of input light as a first optical output signal, the first wavelength shift sensor having a first value of an optical characteristic that modifies intensity of the first optical output signal; and at least one second wavelength shift sensor configured to reflect a second wavelength band of input light as a second optical output signal, the second wavelength shift sensor having a second value of the optical characteristic that modifies intensity of the second optical output signal, wherein the second value is different from the first value; characterized by further comprising a wavelength shift detector optically coupled to the optical fiber and configured to: receive the first and second optical output signals from the first and second wavelength shift sensors; detect a wavelength shift in the first wavelength band and a wavelength shift in the second wavelength band; and generate a first electrical signal responsive to the wavelength shift in the first wavelength band and a second electrical signal responsive to the wavelength shift in the second wavelength band, wherein a difference in amplitude of the first and second electrical signals is responsive to a difference between the intensity of the first optical output signal the intensity of the second optical output signal. an optical fiber; and a set of wavelength shift sensors inscribed on the optical fiber, the set comprising: at least one first wavelength shift sensor configured to reflect a first wavelength band of input light as a first optical output signal, the first wavelength shift sensor having a first value of an optical characteristic that modifies intensity of the first optical output signal; and at least one second wavelength shift sensor configured to reflect a second wavelength band of input light as a second optical output signal, the second wavelength shift sensor having a second value of the optical characteristic that modifies intensity of the second optical output signal, wherein the second value is different from the first value; characterized by further comprising a wavelength shift detector optically coupled to the optical fiber and configured to: receive the first and second optical output signals from the first and second wavelength shift sensors; detect a wavelength shift in the first wavelength band and a wavelength shift in the second wavelength band; and generate a first electrical signal responsive to the wavelength shift in the first wavelength band and a second electrical signal responsive to the wavelength shift in the second wavelength band, wherein a difference in amplitude of the first and second electrical signals is responsive to a difference between the intensity of the first optical output signal the intensity of the second optical output signal. at least one first wavelength shift sensor configured to reflect a first wavelength band of input light as a first optical output signal, the first wavelength shift sensor having a first value of an optical characteristic that modifies intensity of the first optical output signal; and at least one second wavelength shift sensor configured to reflect a second wavelength band of input light as a second optical output signal, the second wavelength shift sensor having a second value of the optical characteristic that modifies intensity of the second optical output signal, wherein the second value is different from the first value; characterized by further comprising a wavelength shift detector optically coupled to the optical fiber and configured to: receive the first and second optical output signals from the first and second wavelength shift sensors; detect a wavelength shift in the first wavelength band and a wavelength shift in the second wavelength band; and generate a first electrical signal responsive to the wavelength shift in the first wavelength band and a second electrical signal responsive to the wavelength shift in the second wavelength band, wherein a difference in amplitude of the first and second electrical signals is responsive to a difference between the intensity of the first optical output signal the intensity of the second optical output signal. receive the first and second optical output signals from the first and second wavelength shift sensors; detect a wavelength shift in the first wavelength band and a wavelength shift in the second wavelength band; and generate a first electrical signal responsive to the wavelength shift in the first wavelength band and a second electrical signal responsive to the wavelength shift in the second wavelength band, wherein a difference in amplitude of the first and second electrical signals is responsive to a difference between the intensity of the first optical output signal the intensity of the second optical output signal.