Optical devices comprising series of birefringent waveplates

Details Optical devices comprising series of birefringent waveplates Optical devices comprising series of birefringent waveplates

2007-07-10

2007-07-10

Keith, Jack (Department: 3663)

Optical: systems and elements

Optical amplifier

C359S483010, C359S494010, C359S490020

Reexamination Certificate

active

10518473

ABSTRACT:
Bidirectional isolating devices including non-reciprocal rotators (i.e. Faraday rotators) and wavelength selective reciprocal polarization rotators are disclosed. Each wavelength selective rotator behaves like a half-wave retarder in a first frequency range and behaves like a full-wave retarder in a second frequency range, according to a substantially periodic transfer function. The rotation has a predetermined number of birefringent elements (e.g. waveplates), the thickness and the orientation of which are chosen so as to obtain a transition between the half-wave retarder behavior and the full-wave retarder behavior in a frequency range lower than or equal to 40% of the period of the transfer function. In order to satisfy such a requirement, a relatively high number of birefringent elements is required, i.e. at least the five birefringent elements. Advantageously, the isolating device may comply with any allocation scheme for the opposite propagating signals.

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A. Yariv and P. Yeh, “Jones Calculus and Its Application to Birefringent Optical Systems,” Chapter 5 of Optical Waves in Crystals, Propagation and Control of Laser Radiation, John Wiley & Sons, Inc., pp. 121-154 (1984).

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