Multichannel optical transport network skew control

Optical communications – Transmitter and receiver system – Including polarization

Reexamination Certificate

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C398S188000, C398S201000

Reexamination Certificate

active

07962043

ABSTRACT:
A system and method are provided for controlling time delay in a multichannel optical transport network transmission device. The method accepts a pair of 2n-phase shift keying (2nPSK) modulated signals via Ix and Qx electrical signal paths, where n>1, and a pair of 2p-PSK modulated signals via Iy and Qy electrical signal paths where p>1. A voltage V1on the Ix signal path is compared with a voltage V2on the Qx signal path, and a VOx voltage in generated, which is minimized by adjusting time delay modules in the Ix and Qx signals paths. Likewise, a voltage V3(Iy) is compared with a voltage V4(Qy), and a VOy voltage is generated and minimized. Subsequent to minimizing VOx and VOy, the sum of V1and V2(V12) is compared with the sum of V3and V4(V34), and a VOxy voltage is generated and minimized.

REFERENCES:
patent: 2004/0081470 (2004-04-01), Griffin
patent: 2009/0148170 (2009-06-01), Perkins

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