An optical ring network architecture including a number (N) of
multi-add/drop filters, such as filters formed using symmetrical pairs of
frequency routers. Each multi-add/drop filter is coupled to two other
multi-add/drop filters using N-2 transmission media, such as optical
fibers, to form a ring. The network also includes a number (N) of
terminal stations associated with the multi-add/drop filters. A terminal
station (p) is coupled with, and receives information from, its
associated multi-add/drop filter (p) through a single optical fiber. In
addition, the terminal station p is coupled with, and transmits
information in a first direction around the ring to, a multi-add/drop
filter p+1 through a single optical fiber. Communications from terminal
station p to each other terminal station in the first direction are
assigned one of N-1 wavelengths such that no two wavelengths on a given
optical fiber are associated with communications between terminal
stations in the same direction. Moreover, all wavelengths on a given
optical fiber may be associated with a communication between terminal
stations in either the first or second direction. As a result, each
terminal station can communicate with each other terminal station
simultaneously using wavelength division multiplexing and N-1
wavelengths. The network may also be bi-directional such that each
terminal station p is coupled with, and transmits information in a second
direction opposite the first direction to, a multi-add/drop filter p-1
through a single optical fiber.