| 摘要 |
The invention provides an optical circulator having a plurality of ports, a non-reciprocal rotator, a beam shifter means in the form of at least one birefringent crystal, a polarization rotator, and a reflector. The plurality of ports is sequentially aligned at one end of the device, while the reflector is disposed at an opposite end. First and second lenses provide efficient coupling between the plurality of ports, in combination with the reflector. Conveniently, the beam shifter provides the beam displacement necessary to switch between successive ports, while simultaneously minimizing the size requirements of the other optical components.
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