US 2013/0170831 A1Published application

Phase-modulated transmission control using embedded control symbols

AssigneeInfinera Corporation

InventorJeffrey T. RAHN

Life of this patent

Estimating the term…

Loading patent…

Abstract

A system receives a phase-modulated signal that carries client symbols and a sequence that includes first symbols on which a first tone is to be based and having a first power level, and second symbols on which a second tone is to be based and having a second power level; processes the sequence to generate the first tone and the second tone; determines a power difference based on the first power level and the second power level; retrieves condition information that identifies a threshold for determining whether a condition is associated with the signal; determines whether the power difference is greater than the threshold; and outputs an instruction, to adjust a parameter, used to transmit the signal, based on the determination that the condition is associated with the signal, where adjusting the parameter causes the power difference to decrease to a level that is less than the threshold.

Claims26

Dependent claims

A method comprising:

receiving, with a node, a phase-modulated signal that carries client symbols and a control sequence, the node having a memory associated therewith, where the control sequence includes:
first control symbols on which a first tone is to be based, the first tone having a first power level, and
second control symbols on which a second tone is to be based, the second tone having a second power level;
processing a first portion of the signal to generate the first tone and a second portion of the signal to generate the second tone, where the first portion includes the first control symbols and where the second portion includes the second control symbols;
determining a power difference based on a difference between the first power level and the second power level;
retrieving, from the memory, condition information, associated with the control sequence, that identifies a threshold for determining whether a condition, that corresponds to a particular type of condition, is associated with the signal based on the power difference;
determining whether the power difference is greater than the threshold;
determining that the condition is associated with the signal when the power difference is greater than the threshold;
and
outputting an instruction to adjust a parameter, used to transmit the signal, based on the determination that the condition is associated with the signal, where the instruction to adjust the parameter causes the power difference to decrease to a level that is less than the threshold.

7 more elements

An optical transmission system, comprising:

one or more devices to:
detect a phase-modulated signal that includes client symbols and a control sequence, where the control sequence includes:
first control symbols that are based on first predetermined phase modulation states, and
second control symbols that are based on second predetermined phase modulation states,
generate a first tone, having a first power level, in response to the first control symbols,
generate a second tone, having a second power level, in response to second control symbols,
identify a power difference between the first tone and the second tone based on the first power level and the second power level,
determine whether the power difference is greater than a threshold,
output the signal, without adjusting a parameter when the power difference is not greater than the threshold, where the parameter controls a manner in which the signal is generated or transmitted,
adjust the parameter to cause the power difference to decrease to a level that is not greater than the threshold when the power difference is greater than the threshold, and
output the signal based the adjusted parameter.

8 more elements

A network device comprising:

a memory to store condition information that identifies a plurality of control sequences and a plurality of conditions to which the plurality of control sequences correspond, where each of the plurality of control sequences correspond to a respective one of the plurality of conditions;
one or more detector components to:
detect a phase-modulated signal that includes client symbols and a control sequence, of the plurality of control sequences, the control sequence allowing a condition of the plurality of conditions, associated with the signal, to be identified,
generate a first tone, having a first power level, in response to first control symbols obtained from the control sequence, and
generate a second tone, having a second power level, in response to second control symbols obtained from the control sequence;
and
one or more processors to:
determine whether a power difference, between the first power level and the second power level, is greater than a threshold identified by the condition information associated with the control sequence,
output the signal, without adjusting a parameter associated with the signal, when the power difference is not greater than the threshold, and
output the signal, in a manner that includes adjusting the parameter, when the power difference is greater than the threshold, where adjusting the parameter causes the power difference to decrease to a level that is less than the threshold.

7 more elements

Dependencies are inferred from the claim text.