Browsing by Author "Hsieh, Po-Jen"

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4-Port polarization-independent wavelength-interleaving bidirectional circulator
(2008-01-15)
Hsieh, Po-Jen
;
Chen, Jing-Heng
;
Hsieh, Hung-Chih
;
Jian, Zhi-Cheng
;
Su, Der-Chin
This study develops an alternative type of 4-port polarization-independent wavelength-interleaving bidirectional circulator. In this circulator the even- and odd-channels circulate with opposite handedness regardless of the state of polarization of signals. It has a pair of orthogonal holographic spatial- and polarization modules (HSPMs) and a Lyot-Ohman filter (LOF). Each HSPM has two holographic spatial walk-off polarizers (HSWPs), two glass plates and two half-wave plates. The function of the HSWJP is firstly described. Next, the structures and the operating principles of the HSPM and the LOF are also described. Then, the operating principle and the performance of this circulator are discussed. It has such merits as polarization-independence, compactness, high isolation, lack of polarization mode dispersion and ease of fabrication. (c) 2007 Elsevier B.V. All rights reserved.
A method for measuring two-dimensional refractive index distribution with the total internal reflection of p-polarized light and the phase-shifting interferometry
(2006-12-01)
Jian, Zhi-Cheng
;
Hsieh, Po-Jen
;
Hsieh, Hung-Chih
;
Chen, Huei-Wen
;
Su, Der-Chin
Based on the total internal reflection of p-polarized light and the phase-shifting interferometry, an alternative method for measuring the two-dimensional refractive index distribution of a material is presented. The p-polarized light is incident on the boundary between a right-angle prism and a tested material. When the total internal reflection occurs at the boundary, and the p-polarized light has a phase variation. It depends on the refractive index of the tested material. Firstly, the two-dimensional phase variation distribution of the p-polarized light at the boundary is measured by the four-step phase shifting interferometric technique. Then, substituting the data into the special equations derived from Fresnel equations, the two-dimensional refractive index distribution of the tested material can be obtained. (c) 2006 Elsevier B.V. All rights reserved.
Multiport polarization-independent wavelength-interleaving bidirectional quasicirculator
(2008-05-01)
Hsieh, Po-Jen
;
Su, Der-Chin
;
光電工程學系
;
Department of Photonics
An alternative type of multiport polarization-independent wavelength-interleaving bidirectional quasicirculator is proposed. It contains holographic spatial and polarization modules (HMs), a Lyot-Ohman filter (LOF), a quarterwave plate, and a mirror. Each HM contains a holographic spatial walk-off polarizer, a half-wave plate, and a glass plate. The LOF consists of three half-wave plates and three identical pairs of crystals. The functions of the HM and the LOF are described. Then, the operating principle and the performance of this quasicirculator are described and discussed. In this circulator, the signals in the even and odd channels can circulate with opposite handedness regardless of signal polarizations. It offers a high isolation level, polarization independence, low polarization-mode dispersion, parallel input/output ports and ease of increasing the number of ports.(c) 2008 Society of Photo-Optical Instrumentation Engineers.
Optimal condition for full-field heterodyne interferometry
(2007-11-01)
Jian, Zhi-Cheng
;
Chen, Yen-Liang
;
Hsieh, Hung-Chih
;
Hsieh, Po-Jen
;
Su, Der-Chin
An area scan digital camera is used to record the full-field heterodyne interference signals, and the processes to derive the associated phases from the data of the recorded frames under a convenient condition are described. By calculating the possible errors under several different cases, an optimal condition to get better results is proposed. (c) 2007 Society of Photo-Optical Instrumentation Engineers.