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Single mode fiber b...
Single mode fiber birefringence compensation in Sagnac and "plug & play" interferometric setups
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- Bogdanski, Jan (författare)
- Stockholms universitet,Fysikum
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Ahrens, Johan (författare)
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- Bourennane, Mohamed (författare)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- 2009
- 2009
- Engelska.
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Ingår i: Optics Express. - 1094-4087. ; 17:6, s. 4485-4494
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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Abstract
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- Single mode fiber (SMF) birefringence effects have been a limiting factor for a variety of Sagnac applications over longer distance SMF links. In this report, we present a new concept of the SMF birefringence compensation in a Sagnac interferometric setup, based on a novel polarization control system. For the destructive interference, our control system guarantees a perfect compensation of both the SMF birefringence and imperfect propagation times matching of the setup’s components. For the stabilization of the constructive interference, we have applied a fiber stretcher and a simple proportional−integral−derivative (PID) controller. The enclosed experimental data of the setup’s visibility confirm validity of our polarization control system. We have also showed that the SMF birefringence model used in a “plug & play” interferometric setup [19], widely cited in the papers on quantum key distribution [11, 12, 13], cannot be applied in SMF Sagnac interferometric setup. However, the SMF birefringence model based on the Kapron equivalence well describes SMF Sagnac.
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