Wavelength switch system using angle multiplexing optics
View Patent ↗Optical switches can include collimator elements that accommodate two or more optical ports. This increases the number of ports the switch can accommodate without having to increase the size of other optical components within the switch. Separate deflectors can be used to accommodate optical signals from two different groups of ports. In some embodiments cross-coupling of signals between the two groups can be accomplished through use of re-direction optics.
1. A wavelength switch system for dynamic switching of multi-channel optical signals having spectral channels of different wavelengths, comprising:
a) a plurality of collimator elements for optical signals having one or more of said spectral channels, each collimator element having two or more separate optical paths for optical ports configured to receive and transmit two or more corresponding independent optical signals at a time, whereby each collimator element accommodates two or more optical ports, whereby there are a plurality of ports that includes two or more corresponding distinct groups of optical ports;
b) a wavelength separator configured to separate multi-channel optical signal from a given port in the plurality of ports into a corresponding group of constituent spectral channels;
c) relay optics optically coupled between the plurality of collimator elements and the wavelength separator, wherein the relay optics are configured to direct optical signals originating from different ports in a given collimator element towards a common point on the wavelength separator but at different angles; and
d) two or more independent arrays of channel deflection elements optically coupled to the wavelength separator, wherein each array of channel deflection elements is configured to selectively direct a group of spectral channels corresponding to one of the two or more optical signals originating from a given port in a given group of the two or more distinct groups of optical ports toward a different one or more selected ports in the given group of optical ports.
2. The system of claim 1 wherein two or more of the arrays of channel deflection elements are oriented at an angle with respect to each other to accommodate coupling of optical signals incident on the wavelength separator at different angles to respectively different arrays of channel deflection elements.
3. The system of claim 1 , wherein each collimator element in the plurality of collimator elements includes two or more waveguides and a single lens optically coupled to the two or more waveguides, wherein the two or more waveguides are separated by a fixed offset.
4. The system of claim 3 wherein the two or more waveguides are substantially parallel to each other.
5. The system of claim 4 wherein the fixed offset is about 2 times a width of the waveguides.
6. The system of claim 1 , wherein the wavelength separator includes an interference filter, a polarizing filter, an arrayed waveguide grating, a prism, or a diffraction grating.
7. The system of claim 1 , wherein the channel deflection elements of the two or more arrays include microelectromechanical system (MEMS) mirrors, liquid crystal on silicon (LCOS) devices, bi-stable liquid crystals, UV curable optical mediums, or photorefractive holographic gratings.
8. The system of claim 1 , further comprising redirection optics configured to receive the group of spectral channels emanating from one of the two or more arrays of channel deflection elements and redirect said group of spectral channels towards another one of the two or more arrays of channel deflection elements.
9. The system of claim 8 , wherein the redirection optics include two cylindrical lenses coupled to one or more redirection mirrors.
10. The system of claim 9 , further comprising focusing optics optically coupled between the wavelength separator and the arrays of channel deflection elements and between the arrays of channel deflection elements and the redirection optics, the wherein the two cylindrical lenses and focusing optics are configured to form a 4f optical system.