Single mode fiber birefringence compensation in Sagnac and "plug & play" interferometric setups
2009 (English)In: Optics Express, ISSN 1094-4087, Vol. 17, no 6, 4485-4494 p.Article in journal (Refereed) Published
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 , 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.
Place, publisher, year, edition, pages
2009. Vol. 17, no 6, 4485-4494 p.
IdentifiersURN: urn:nbn:se:su:diva-26542DOI: 10.1364/OE.17.004485ISI: 000264747300030OAI: oai:DiVA.org:su-26542DiVA: diva2:210397