Mechanical Fibre Optic Polarisation Controller
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The mechanical polarisation controllers offer an economical and convenient means of controlling the optical state of polarisation (SOP). By winding a specified number of loops of optical fibre around the 3 grooved, tiltable discs, a sequence of adjustable 1/4, 1/2 and 1/4 lambda waveplates are formed. Simply adjusting the tilt angle of the three discs then allows any arbitrary incoming SOP to be transformed into any other SOP. As a result of the very careful mechanical design of the controllers, they exhibit the lowest polarisation-dependent loss of any polarisation control device available.
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