Polarization effects in optical fiber current sensors based on Sagnac interferometers with 3{times}3 couplers
- National Inst. of Standards and Technology, Boulder, CO (United States)
- Los Alamos National Lab., NM (United States)
Response functions of an ideal Sagnac optical fiber cut-rent sensor based on a 3{times}3 coupler fundamentally depend on the polarization state of light catering coupler, even for a zero birefringence system. The desired response functions, cosinusoids separated by 120{degrees} phase shifts, are obtained only for circularly polarized light. The response functions for linearly polarized and depolarized inputs are cosinusoids separated by 180{degrees}, and yield only zero- slope small-signal responses. Also, two outputs are degenerate, so that the response is similar to that observed in 2{times}2 systems. Thus, 3{times}3 couplers offer no advantage over 2{times}2 systems for linear polarized light. This result increases system complexity in that polarization control optics are required to supply the proper polarization, even for an ideal, zero-birefringence system.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10160184
- Report Number(s):
- LA-UR-93-1449; CONF-930588-2; ON: DE93012665
- Resource Relation:
- Conference: 9. optical fiber sensors conference,Firenze (Italy),4-6 May 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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