Polarization scrambler

Details Polarization scrambler Polarization scrambler

1988-08-16

1990-05-08

Bovernick, Rodney B.

350 9613, 350371, G02F 109

Patent

active

049232908

ABSTRACT:
The invention relates to a polarization scrambler comprising a controllable optical phase retardation element for retarding with respect to one another components of a light beam with a different state of polarization, the light beam propagating through the element, and a control arrangement for controlling the phase retardation element, said control arrangement being adapted to supply a control signal so that as a function of time the phase retardation is controlled in such a way that with a given state of polarization (SOP) of the light entering the polarization scrambler varying states of polarization occur at its output in such a way that, averaged in time, the light intensities emerging in each SOP are at least substantially equal. An arrangement suitable for arbitrary input states of polarization is obtained when at least a further controllable phase retardation element (2, 3) connected to a control arrangement and succeeding the first element in the light propagation direction is provided which, represented on the Poincare sphere, creates states of polarization in accordance with a rotational axis which is different from that associated with the first phase retardation element and in that the phase retardation elements (1, 2, 3 ) are controlled by the control arrangement at different frequencies (f.sub.1, f.sub.2, f.sub.3) or in an uncorrelated aperiodical manner.

REFERENCES:
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patent: 3239671 (1966-03-01), Buhrer
patent: 3407364 (1968-10-01), Turner
patent: 3435228 (1969-03-01), Gordon
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patent: 3558215 (1971-01-01), Lang et al.
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patent: 4097110 (1978-06-01), Carey
patent: 4222668 (1980-09-01), Henry
Electronics Letters (vol. 23, No. 12, pp. 634-636), Kersey et al., "Monomode Fibre Polarization Scrambler," Jun. 4, 1987.

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