METHOD AND APPARATUS TO OVERCOME LINEWIDTH PROBLEMS IN FAST RECONFIGURABLE NETWORKS
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Apr 12, 2011
filing date -
Apr 21, 2010
priority date (Note) -
Abandoned
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Abstract
In wavelength switching optical networks, the optical data being transmitted may be routed to different end points by switching the operating frequency of the laser. However, the phase noise of the laser source increases following a switching event. This increased phase noise can prevent the successful transmission of phase modulation formats which are sensitive to it. Accordingly, it is generally necessary to wait a short period before transmitting data. However, the period may be as long as the data packet being transmitted (e.g. 3 μS), which is a limiting factor. The present application obviates this problem by including a radio frequency pilot tone with the data prior to modulation onto the optical carrier.
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