Implementation of a large-scale multi-stage non-blocking optical circuit switch

摘要

Embodiments provide a methodology for designing a large-scale non-blocking OCS using a multi-stage folded CLOS switch architecture for use in datacenter networks and fiber-rich backbone network POPs. One aspect employs a folded CLOS architecture because of its ease of implementation, enabling the topology to scale arbitrarily with increasing number of stages. The fraction of ports allocated for internal switch wiring (overhead) also increases with the number of stages. Design decisions are made to carefully optimize the insertion loss per module, number of ports per module, number of stages and the total scale required. Other embodiments include folded CLOS switch architectures having at least two stages. In one example, power monitoring may be included only on the leaf switches.

主权项

1. An optical circuit switching device, comprising:
a first stage including a first plurality of 2n by 2n optical circuit switching modules; a second stage including a second plurality of 2n by 2n optical circuit switching modules, the second plurality of optical circuit switching modules being fewer than the first plurality of optical circuit switching modules; a first plurality of optical fibers interconnecting ports of the first and second pluralities of optical circuit switching modules in a two-stage folded CLOS topology, wherein the plurality of optical fibers is fusion spliced to the ports for propagating optical signals between the first and second stages; a front plate coupled to the first stage via a second plurality of optical fibers, the front plate being configured to interface with one or more external devices; wherein each optical circuit switching module of the first stage includes a power monitoring mechanism configured to perform end-to-end power monitoring across at least one optical circuit switching module of the first stage and at least one optical circuit switching module of the second stage; and wherein none of the optical circuit switching modules of the second stage includes a power monitoring mechanism.