| 摘要 |
<p>A reversible optical circulatorÄ150, 400Ü and a coupling device constructed therefrom. The optical circulatorÄ150, 400Ü includes first and second non-reciprocal optical elements having magnetic field generators for generating magnetic fields that determine the rotation of the polarization vector of light signals passing therethrough. The non-reciprocal optical elements rotate the polarization of the light signals by either 90 degrees or 0 degrees depending on the direction of the magnetic field associated with that non-reciprocal element. The reversible circulatorÄ312Ü can be combined with wavelength selective reflectorsÄ330, 332Ü to form a light coupling deviceÄ360Ü that adds a first light signal having a wavelength of lambda 1 to a second light signal of wavelength lambda 2 traveling in an optical channelÄ304Ü. The direction of the added light signal in the optical channelÄ304Ü is controlled by the direction of the magnetic field in the optical circulatorÄ312Ü and the choice of which selective reflectorÄ330, 332Ü is active. <IMAGE></p> |
