The invention relates to a ring or on-line optical fiber Sagnac interferometer. According to the invention, the interferometer includes a hybrid optical circuit (200), which comprises at least one first substrate ((1) Electro Optics and a second transparent substrate (() 2), the second transparent substrate having a common interface (() 20), and the first substrate comprising a first optical waveguide (() 11, a second transparent substrate (() 2), and a second transparent substrate (() 2),Second optical waveguideThe first optical waveguide () and the second optical waveguide () are connected to at least one end () 61 () 6 of the optical fiber coil,The input-output optical waveguide () 10 connected to the light source () and the detection system ()The second substrate () includes at least one U-shaped optical waveguide ((21) and a hybrid optical circuit () 200, which comprises a planar waveguide junction y () 26 having a common branch () 160 and two branches () 161162).
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