Patent ID: 6516119
Filing Date: 2003-02-04
Classification: G02B

Abstract:
A device for comparing an optical signal wavelength value or values with at least one nominal wavelength value (&lgr;ei), the said device including a phasar with a grating (R) of guides (Gj), provided with N monitoring input ports (GEi) associated respectively with N nominal wavelength values (&lgr;ei), so that any optical signal having one of the said nominal wavelength values and being applied to the port associated with this nominal wavelength value focus at two focal points corresponding respectively to two interference orders of the grating (R), the said phasar having two monitoring output ports (A, B) placed respectively about the said focal points, characterised in that the said phasar is designed so that the transmission function representing the variations in transmission between an input monitoring port and an output monitoring port as a function of the wavelength has a representative curve substantially triangular in shape about the nominal wavelength value associated with the said input port.