Tyco Electronics Subsea Communications LLC

Tyco Telecommunications (us) Inc.

Matthew V Mazurczyk

Alexei N Pilipetskii

Dmitri G Foursa

Hussam G Batshon

Sameh A Sabet

Jin-Xing Cai

Oleg V Sinkin

Sameh Sabet

An optical subcarrier multiplex system. An input data signal is jointly coded with at least one forward error correction (FEC) code before symbol mapping and before subcarrier modulation. Joint FEC coding mitigates non-uniform subcarrier performance.

Optical subcarrier multiplex system with joint forward error correction coding

A system and method including a transmitter including digital signal processor for providing a shaped data output in response to an input data stream. The shaped data output is coupled to a modulator that modulates an optical signal in response to the shaped data output to provide a non-rectangular shaped output having channel spacing greater than Nyquist channel spacing. Providing a shaped output consistent the present disclosure mitigates the effects of non-linear impairments in an optical transmission system.

System and method using spectral shaping and expanded channel spacing

A method and apparatus for controlling bias and alignment in an optical signal transmitter for providing intensity modulation and DPSK modulation to an optical signal, e.g. in an RZ-DPSK modulation format. Output power in dither signals applied to the bias signals may be detected by a low speed photodetector. One or more of the bias signals may be adjusted in a low speed control loop in response to an error signal obtained by mixing the detected signal with the low frequency dither signals.

Method and apparatus for bias and alignment control in an optical signal transmitter

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Middletown, NJ, United States of America

Matthew V Mazurczyk