Optical: systems and elements – Polarization without modulation – Depolarization
Patent
1991-11-27
1993-05-18
Lerner, Martin
Optical: systems and elements
Polarization without modulation
Depolarization
359495, 359497, G02B 530, G02B 2728
Patent
active
052125947
ABSTRACT:
A communication line joint arrangement comprising two parts between which relative rotation and the transmission of at least two channels using electromagnetic energy such as light is facilitated, each part comprising polarising beam splitter means operatively associated with quarter wave plate means, wherein the polarising beam splitter means of the two parts are arranged to pass two orthogonally related polarised input channel signals to the quarter wave plate means associated therewith, so as to produce two corresponding circularly polarised channel signals of opposite directional sense which are transmitted between the quarter wave plate means, across an interface between the parts, so as to produce two corresponding orthogonally polarised output channel signals from the polarising beam splitter means. By arranging that the two channel signals are circularly polarised in opposite senses as they traverse the interface between the two relatively rotatable parts, mutual interference between channels and/or breakdown of communication in the presence of rotation between the parts is thereby obviated.
REFERENCES:
patent: 2432432 (1947-12-01), MacNeille
patent: 4685773 (1987-08-01), Carlsen et al.
Lerner Martin
Roke Manor Research Limited
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