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US 8,542,996 B2Granted
Optical packet switching apparatus
AssigneeFujitsu Telecom Networks Limited
InventorsWataru Kawasaki, Shota Mori
Life of this patent
Estimating the term…
Abstract
An optical packet switching apparatus includes an optical coupler, an optical switch unit, and an optical switch control unit. The optical switch control unit includes an optical-to-electrical converter, a serial/parallel converter, an arrangement detector, a rearrangement unit, a frame synchronization unit, a route detector, a control signal generator, and an adjustment unit for adjusting the timing with which to output an optical switch control signal to the optical switch unit, based on arrangement information on a frame synchronization pattern fed from the arrangement detector.
Claims15
An optical packet switching apparatus comprising:
- a branching unit configured to branch off a received optical packet signal;
- an optical switch unit configured to switch a route of one of the branched-off optical packet signal so as to output the optical packet signal;
- and
- an optical switch control unit configured to extract routing information from an other of the branched-off optical packet signal and configured to control the optical switching unit according to the extracted routing information,
- the optical switch control unit including:
- an optical-to-electrical (O/E) converter configured to convert the other of the branched-off optical packet signal into an electrical data signal and configured to extract a clock signal from the electrical data signal;
- a serial/parallel converter configured to perform a serial/parallel conversion of the electrical data signal into a parallel data signal and configured to divide the frequency of the clock signal so as to generate a divided clock signal;
- an arrangement detector configured to detect an arrangement of a frame synchronization pattern contained in the parallel data;
- a rearrangement unit configured to rearrange the parallel data signal based on detected arrangement information on the frame synchronization pattern;
- a frame synchronization unit configured to establish frame synchronization based on the frame synchronization pattern contained in the rearranged parallel data signal;
- a route detector configured to detect routing information contained in the rearranged parallel data signal after the frame synchronization has been established;
- a generator configured to generate an optical switch control signal used to control the optical switch unit based on the detected routing information;
- and
- an adjustment unit configured to adjust output timing with which to output the optical switch control signal to the optical switch unit, based on the arrangement information on the frame synchronization pattern.
11 more elements
An optical packet switching apparatus comprising:
- a branching unit configured to branch off a received optical packet signal;
- an optical switch unit configured to switch a route of one of the branched-off optical packet signal so as to output the optical packet signal;
- and
- an optical switch control unit configured to extract routing information from an other of the branched-off optical packet signal and configured to control the optical switching unit according to the extracted routing information,
- the optical switch control unit including:
- an optical-to-electrical (O/E) converter configured to convert the other of the branched off optical packet signal into an electrical data signal and configured to extract a clock signal from the electrical data signal;
- a serial/parallel converter configured to perform a serial/parallel conversion of the electrical data signal into a parallel data signal and configured to divide the frequency of the clock signal so as to generate a divided clock signal;
- a local oscillator configured to oscillate a local clock signal;
- a clock transfer unit configured to perform a transfer from the parallel data signal synchronized with the divided clock signal, to the local clock signal;
- a route detector configured to detect the routing information contained in the parallel data signal;
- a generator configured to generate an optical switch control signal used to control the optical switch unit based on the detected routing information;
- a phase difference detector configured to detect a phase difference between the divided clock signal and the local clock signal;
- and
- an adjustment unit configured to adjust output timing of the optical switch control signal, based on information on the phase difference fed from the phase difference detector.
11 more elements
Dependencies are inferred from the claim text.