Kyu Ho Kim

US Patent:

20140023368, Jan 23, 2014

Filed:

Jul 20, 2012

Appl. No.:

13/553936

Inventors:

Suhas P. Bhandare - Levittown PA, US
Heider Ereifej - Quakertown PA, US
Kyu Kim - North Wales PA, US
Mark Colyar - New Hope PA, US

Assignee:

FINISAR CORPORATION - Horsham PA

International Classification:

H04B 10/04
H04J 14/00

US Classification:

398 65, 398184

Abstract:

A DP-QPSK optical transmitter includes an outer MZM comprising a first parent MZM comprising a first child MZM and a second child MZM that modulates a QPSK signal with a first polarization. A second parent MZM includes a first child MZM and a second child MZM that modulates a QPSK signal with a second polarization. The outer Mach-Zehnder modulator multiplexes the first and second polarization embedded into a dual-polarization QPSK signal generation. A first optical detector detects the QPSK signal generated by the first parent MZM with the first polarization. A second optical detector optical detects the QPSK signal generated by the second parent Mach-Zehnder modulator with the second polarization. A bias control circuit generates bias signals on at least one output that stabilize the DP-QPSK signal in response to signals generated by the first and second optical detector using electrical time division multiplexing.