Polarization control for multichannel and polarization...

Details Polarization control for multichannel and polarization... Polarization control for multichannel and polarization...

2008-12-03

2009-10-13

Phan, Hanh (Department: 2613)

Optical communications

Receiver

C398S208000, C398S209000, C398S152000, C398S205000, C398S206000, C385S011000

Reexamination Certificate

active

07603044

ABSTRACT:
A system and method are provided for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver. The method accepts a composite signal and separates the polarization of the signal into a pair of 2n-phase shift keying (2n-PSK) modulated input signals via Ix and Qx optical signal paths, where n≧1. Likewise, a pair of 2p-PSK modulated input signals are accepted via Iy and Qy optical signal paths where p≧1. Polarization-adjusted I′x, Q′x, I′y, and Q′y signals are generated. An average magnitude is compared to either 2×the absolute magnitude of (I′x and Q′x), or 2×the absolute magnitude of (I′y and Q′y). The average magnitude value can be used that is either 2×(a predetermined peak signal amplitude), or the sum of the absolute magnitudes of (I′x and Q′x) and (I′y and Q′y). The polarization-adjusted I′x, Q′x, I′y, and Q′y signals are modified until the magnitude comparison is about zero.

REFERENCES:
patent: 2007/0092259 (2007-04-01), Bontu et al.

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