White light interferometric fiber-optic gyroscope based on rhombic optical path difference bias structure

A white light interferometric fiber-optic gyroscope based on a rhombic optical path difference bias structure, the white light interferometric fiber-optic gyroscope based on the rhombic optical path difference bias structure comprising:

• a laser;
• a rhombic optical path difference bias structure;
• a fiber coil;
• and
• a photodetector,
• wherein the rhombic optical path difference bias structure comprises four fiber couplers with a splitting ratio of 50:50, and fibers for connecting the fiber couplers;
• a ring is formed by connection between a first fiber coupler and a second fiber coupler, between the second fiber coupler and a third fiber coupler, between the third fiber coupler and a fourth fiber coupler and between the fourth fiber coupler and the first fiber coupler respectively by a first fiber, a second fiber, a third fiber and a fourth fiber;
• wherein the lengths of the first fiber, the second fiber, the third fiber and the fourth fiber are inconsistent to introduce an optical path difference bias,
• wherein an optical bandpass filter is connected behind the rhombic optical path difference bias structure,
• wherein the laser is connected with the first fiber coupler through a fifth fiber, and the photodetector is connected with the third fiber coupler through a sixth fiber, and
• wherein both ends of the fiber coil are connected with the second fiber coupler and the fourth fiber coupler respectively.