Patent ID: 7405820

Claim:
A device for optical spectrum analysis by Brillouin Scattering, the device comprising: an optical source an optical fiber link an optical circulator that accesses said optical fiber link by a first end of said optical fiber link, an optical access that comprises an optical isolator, a polarization controller arranged between said optical circulator and said optical fiber link, a detection system, and a control system wherein: said optical fiber link receives an optical probe signal from said optical source via said optical circulator and an optical test signal whose spectrum is to be measured from an external source via said optical access, said probe signal is input into said optical fiber link at said first end of said optical fiber link, said test signal is input into said optical fiber link at a second end of said optical fiber link that is opposite to said first end of said optical fiber link, said fiber link is a material that is suitable for a Brillouin effect interaction between the probe signal and the test signal, an optical output signal obtained by said optical circulator is carried to said detection system, and an electric signal derived from said detection system is applied to said control system, and the device provides a spectral component measurement of the test signal based on a wavelength of the probe signal and obtains a spectrum of the test signal.