Redundant wavelength division multiplexing devices and methods for processing light using same

A redundant wavelength division multiplexing (WDM) device comprising:

• a first common port including a collimator configured to transmit a first optical beam that includes a first plurality of optical signals;
• a second common port including a collimator configured to transmit a second optical beam that includes a second plurality of optical signals, the second common port being spaced apart from the first common port;
• a plurality of filters that define an optical path for each of the first optical beam and the second optical beam, wherein each filter is oriented to interact with each of the first optical beam and the second optical beam;
• and
• a plurality of first channel ports and a plurality of second channel ports, wherein each channel port includes a respective channel collimator,
• wherein a sum of a number of the first channel ports and a number of the second channel ports is equal to twice a number of the plurality of filters,
• wherein the first common port and the plurality of first channel ports define a first plane,
• wherein the second common port and the plurality of second channel ports define a second plane that is spaced apart from the first plane, and
• wherein one-half of the first channel ports forms a first column that defines a first plane, one-half of the second channel ports forms a second column that defines a second plane, one-half of the first channel ports forms a third column that defines a third plane, and one-half of the second channel ports forms a fourth column that defines a fourth plane,
• wherein the first plane, the second plane, the third plane, and the fourth plane are spaced apart from each other.