Photonic bandgap fibers(PBFs)have advantages that traditional fiber cannot compare for its'unique structural form,transmission medium,and light guide mechanism.PBFs is an ideal choice for fi-ber-optic gyroscope(FOG)in the future.However,the rough inner surface of PBFs'core result in strong backscatter secondary wave,which results in additional non-reciprocal errors of photonic bandgap fi-ber-optic gyroscope(PBFOG).In order to quantitatively analyze the intensity of backscatter secondary wave of PBFs,a simple backscatter secondary wave model of PBFs was established based on electric di-pole radiation theory.Power spectral density of inner surface of PBFs'core was obtained by focused ion beam processing and atomic force microscopy,and the theoretical backscattering coefficient of PBF(HC-1550-02)can be calculated as 2.61×10-9/mm.The measured backscattering coefficient of PBF(HC-1550-02)is～1.82×10-9/mm by optical frequency domain back-reflection scatter instrument,which pri-marily verify the correctness of backscatter secondary wave model,it lays a foundation for the research of suppression technology of backscatter secondary wave.
photonic bandgap fiberbackscatter secondary wavepower spectral density
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