lab2 - Experimental setup of experimento s h P h e l p s A...

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e experimental apparatus is as follows: 1) Bare fiber adaptor. 2) Polarizing filter. 3) Infrared detector. us is as follows: 1) Bare fiber adaptor. 2) Polarization controller. 3) Polarizing filter. 4) Infrared detector. 3: Experimental setup of experiment 3. gure the experimental apparatus is the following:- aser er wave plate ng filter detector s. Polarization Angle (Polarization controller pointing away) J o s h P h e l p s , A k s h a y Pa n c h a v a t i a n d N a r a y a n a Pa p p u | 1 I NTRODUCTION : All light including its various polarizations and propagation can be described through the use of Maxwell’s equations. Maxwell’s equations lead to the result that as light propagates, its magnetic field and electric fields are always transverse to each other and the propagation direction of light. All light can be described as a linear combination of two orthogonal polarizations. Since most light is not polarized as either linear, elliptical or circular it is possible to obtain polarized light from unpublicized light though the use of a polarizer which only lets one polarization pass through. The goal of this experiment was three fold. (i) To determine the polarization of the light produced by the tunable laser. (ii) To determine the polarization of the light by inducing birefringence into the fiber. (iii) To prove that the output of the HeNe laser is a kind of linear polarizer and observe elliptically or even circularly polarized light. M ATERIALS AND M ETHODS : The optical fiber used in these experiments was the SMF-28 fiber. This fiber is a single mode fiber that supports any kind of polarization. Furthermore, it should be noted that it is possible to alter the fiber such that light will propagate in a given polarization state past the point of where the alteration is made. The technique used to alter the state of polarization through the addition of external forces is known as stress-induced birefringence , Additionally, some of the experiments described in this report use a tunable laser that precisely positions a grating at the sub-micron level to produce a wavelength of light (selected by the experimenter) at the output of the laser. The output of the tunable laser was coupled into the SMF-28 fiber through the use of a bare fiber adaptor of type FC. The output of the tunable laser was set using the ShellIQ program (provided) to a wavelength of 1550 nm with the output power set at 4.2 dBm. The output of the laser was only initialized when measurements were being taken. Finally, the power output at the various measurement points were taken through use of the Newport 1830-C Optical Power meter fed from an 818-IR detector. To prepare for the experiments preformed in this lab we first stripped the SMF-28 fiber and cleaved the end to the proper size through the use of the cleaver provided. After which, we cleaned the ends of the fiber through the use of cotton swabs doused in Isopropanol.
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