Patent ID: 7933517
Filing Date: 2011-04-26
Classification: H04B

Abstract:
1. A method of detecting and recovering a failure in a protected single-fiber passive optical network, wherein the protected single-fiber passive optical network comprises a first interface including a first transmitter and a first receiver, a second interface including a second transmitter and a second receiver, an optical fiber connecting the first and second interfaces, a plurality of passive nodes between the first and second interfaces, and a plurality of optical network units connected to the plurality of passive nodes, and wherein the first and second interfaces are co-located at an optical line terminal, the method comprising: receiving optical signals from the first interface at the second interface via the optical fiber; detecting at the second interface a degradation in power level of the optical signals received from the first interface; synchronizing at least some of the plurality of optical network units with the second interface; in response to said detecting, switching on the second transmitter of the second interface; receiving affected traffic at the second interface via the optical line terminal, wherein the affected traffic comprises traffic from the first interface that was disrupted by a failure associated with the degradation in power level; and sending the affected traffic from the second interface to at least one of the plurality of optical network units.