Second order predistortor for a return laser transmitter

Details Second order predistortor for a return laser transmitter Second order predistortor for a return laser transmitter

H - Electricity

04

B

H04B 10/155 (2006.01) H03F 1/32 (2006.01)

Patent

CA 2382965

The invention provides a second order predistortion circuit which reduces distortions generated by an optical return laser transmitter. The predistortion circuit uses emitter follower as a second order distortion generator. Controlling the emitter D.C. current, the level of second order distortion signals can be easily controlled over a wide range. This predistortion circuit can be confirmed with a digital control circuit for laser distortion compensation over temperature.

L'invention concerne un circuit de prédistorsion du second ordre, qui réduit les distorsions générées par un émetteur laser d'adaptation optique. Le circuit de prédistorsion met en oeuvre un émetteur-suiveur comme générateur de distorsion du second ordre. La régulation du courant direct de l'émetteur permet de contrôler facilement les signaux de distorsion du second ordre sur une large plage. Le circuit de prédistorsion peut être contrôlé au moyen d'un circuit de commande numérique pour compenser en température la distorsion laser.

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