Patent ID: 9100116
Filing Date: 2015-08-04
Classification: H04B

Abstract:
1. A coherent optical receiver, comprising: electrical compensation circuitry configured to receive an optical signal and to compensate impairments thereon; a Local Oscillator (LO); memory configured to store one or more pre-stored maps of information, wherein the one or more pre-stored maps comprise multi-dimensional data and are dependent on a protection scheme utilized; and an expedited acquisition engine configured to reacquire the optical signal responsive to a filter error in the electrical compensation circuitry and to reacquire the optical signal responsive to a loss of the optical signal; wherein the expedited acquisition engine is in a traffic carrying state while the optical signal is within normal operating ranges and, when an error or fault occurs, determines a severity of the error or fault and which one of a plurality of recovery levels is to be implemented in order to minimize reacquisition time, wherein each of the plurality of recovery levels addresses a different error or fault and requires a different amount of reacquisition time, the expedited acquisition engine utilizing, in at least one of the plurality of recovery levels, the one or more pre-stored maps to reacquire the optical signal without having to resort to full reacquisition; and wherein the one or more pre-stored maps comprise at least one of fiber dispersion information, filter coefficients, and frequency offsets for setting the Local Oscillator (LO).