Manufacture and testing of fiber optic cassette

A method for forming two separate flexible optical circuits, the method comprising:

• providing a double flexible optical circuit including a flexible substrate supporting a plurality of optical fibers, with a first multi-fiber connector terminating the optical fibers at a first end of the double flexible optical circuit, and a second multi-fiber connector terminating the optical fibers at a second end of the double flexible optical circuit, wherein routing paths of the plurality of optical fibers separate from the first multi-fiber connector as the optical fibers lead toward a center of the double flexible optical circuit and the routing paths converge back as the optical fibers lead toward the second multi-fiber connector;
• testing the double flexible optical circuit through the first and second connectors;
• and
• after testing, dividing the double flexible optical circuit in half to form the two separate flexible optical circuits.