W. KhunnamP. P. YupapinMahidol University2018-09-132018-09-132009-09-01Optik. Vol.120, No.14 (2009), 731-735003040262-s2.0-68949178462https://repository.li.mahidol.ac.th/handle/20.500.14594/27551We firstly present an experimental investigation of the entangled photon states' recovery using a fiber optic ring resonator incorporating an erbium-doped fiber amplifier (EDFA). The weak light entangled photons can be recovered in both amplitude and states after the optical pumping and polarization control parts are used in the system. A new experimental result of the investigation of thermal effects on the entangled states' walk-off and compensations has shown that the entangled photon walk-off compensation is achieved by using a pair of polarization control devices. The relationship between thermal effects and the entangled states' phase shift is investigated and discussed. The walk-off compensation due to temperature changes from 30 to 80 °C is achieved. This shows that the changes in phase of the entangled photons can be negligible when the compensation is employed. © 2008 Elsevier GmbH. All rights reserved.Mahidol UniversityEngineeringMaterials SciencePhysics and AstronomyArticleSCOPUS10.1016/j.ijleo.2008.02.025