Free-space optical isolator
OwnerYu Zhenginventor
Life of this patent
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Abstract
A new low-cost free-space optical isolator is disclosed in this invention. The new free-space optical isolator includes an input polarizer, a Faraday rotator, an output polarizer, and a magnetic tube. By employing the recently developed subwavelength optical elements (SOEs) technology, the input polarizer is directly manufactured on the left surface of the Faraday rotator and the output polarizer is directly manufactured on the right surface of the Faraday rotator. Relative to the polarization axis of the input polarizer, the polarization axis of the output polarizer is 45 degrees clockwise from left to right.
Claims25
A free-space optical isolator comprising:
- a Faraday rotator having a first-end surface and a second-end surface wherein at least one of said first-end surface and said second-end surface further comprising sub-wavelength patterns constituting a polarizer.
A free-space optical isolator comprising:
- a polarization angle rotating means;
- a first and a second polarizing means, wherein at least one of said first and second polarizing means comprising sub-wavelength patterns for polarizing, transmitting and receiving an optical transmission to and from said polarization rotating means for allowing an optical transmission only in a forward projecting direction.
A method for manufacturing a free-space optical isolator comprising a step of:
- forming a set of sub-wavelength patterns constituting a polarizer on at least one of an input and an output end-surfaces of a Faraday rotator for transmitting a forward projecting optical signal from said input end-surface to said output end-surface and preventing a reverse transmission of a reverse optical signal from said output end-surface to said input end-surface.
A method of manufacturing a free-space optical isolator comprising:
- providing a polarization angle rotating means;
- forming at least one of a first and a second polarizing means each comprising sub-wavelength patterns for polarizing, transmitting and receiving an optical transmission to and from said polarization rotating means for allowing an optical transmission only in a forward projecting direction.
A free-space optical isolator comprising:
- a Faraday rotator having a first-end surface and a second-end surface;
- a layer of non Faraday material on at least one of said first- and second-end surfaces wherein said layer of non Faraday material further comprising sub-wavelength patterns constituting a polarizer.
Dependencies are inferred from the claim text.