Toroidal micro lens array for use in a wavelength selective switch
An optical device includes a plurality of optical ports for receiving optical beams. The optical device also includes a plurality of toric micro lenses each receiving one of the optical beams from a respective one of the optical ports. A dispersion element is provided for spatially separating in a dispersion plane the optical beam into a plurality of wavelength components. At least one focusing element is provided for focusing the plurality of wavelength components. A programmable optical phase modulator is also provided for receiving the focused plurality of wavelength components. The modulator is configured to selectively direct the wavelength components to prescribed ones of the optical ports. The toric lenses impart positive power to the optical beams in the port plane and negative optical power to the optical beams in a plane orthogonal to the port plane.
1. An optical device, comprising:
a plurality of optical ports for receiving optical beams;
a plurality of toric micro lenses each receiving one of the optical beams from a respective one of the optical ports,
a dispersion element for spatially separating in a dispersion plane the optical beam into a plurality of wavelength components;
at least one focusing element for focusing the plurality of wavelength components; and
a programmable optical phase modulator for receiving the focused plurality of wavelength components, the modulator being configured to selectively direct the wavelength components to prescribed ones of the optical ports, wherein the toric lenses impart positive power to the optical beams in the port plane and negative optical power to the optical beams in a plane orthogonal to the port plane.
2. The optical device of claim 1 , wherein the toric lenses are aspheric toric lenses.
3. The optical device of claim 1 , wherein the toric micro lenses are positioned relative to the optical ports from which the optical beams are respectively received such that a beam waist of the optical beams in the orthogonal direction is projected beyond a focal length of the toric micro lenses.
4. The optical device of claim 1 , wherein each of the optical ports includes an optical fiber.
5. The optical device of claim 1 , wherein the programmable optical phase modulator includes a liquid crystal-based phase modulator.
6. The optical device of claim 5 , wherein the liquid crystal-based phase modulator is a LCoS device.
7. The optical device of claim 1 , wherein the dispersive element is selected from the group consisting of a diffraction grating and a prism.
8. An optical launch arrangement comprising:
an array of optical fibers; and
an array of micro lenses, each of the micro lenses being in registration with one of the optical fibers to receive an optical beam directly from the respective optical fiber with which it is in registration without any intervening optical elements, each micro lens being a toric lens that causes an optical beam passing therethough to have a beam waist in one plane that is different in size from a beam waist in an orthogonal plane.
9. The optical launch arrangement of claim 8 , wherein the toric lenses are aspheric toric lenses.