Patent ID: 8244143

Claim:
A method for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver, the method comprising; accepting a pair of 2 n -phase shift keying (2 n -PSK) modulated input signals via Ix and Qx optical signal paths, where n≧1; accepting a pair of 2 p -PSK modulated input signals via Iy and Qy optical signal paths where p≧1; generating polarization-adjusted I′x, Q′x, and Q′y signals; comparing an average magnitude to a magnitude selected from a group consisting of 2× the absolute magnitude of (I′x and Q′x) and 2× the absolute magnitude of (I′y and Q′y); and, modifying the polarization-adjusted I′x, Q′x, I′y, and Q′y signals until the magnitude comparison is about zero.