## Abstract

A dual-drive LiNbO_{3} architecture modulator with chirp management is proposed and developed offering SFDR > 25 dB in a 1.4 V bias excursion compared to only 0.5 V bias excursion in a conventional Mach-Zehnder electro-optical modulator (MZ-EOM). The architecture effectively extends the linear regime and enables the optical transmission of wireless systems employing orthogonal division multiplexing (OFDM) modulation such as ultra-wide band (UWB) which require high linearity over a broad frequency range due to their high peak-to-average power ratio (PARP). Radio-over-fiber UWB transmission in a passive optical network is experimentally demonstrated employing this technique, exhibiting an enhancement of 2.2 dB in EVM after 57 km SSMF when the dual-drive developed modulator is employed.

©2011 Optical Society of America

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### Equations (7)

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(1)
$$\omega \left(t\right)=\omega -\beta \kappa \frac{\partial V\left(t\right)}{\partial t}\text{with}\kappa =\frac{\pi}{2{\eta}_{0}{\text{V}}_{\text{\pi}}}$$
(2)
$$V\left(t\right)={\text{V}}_{\text{O}}\mathrm{exp}\left(-\frac{{t}^{2}}{{\tau}^{2}}\right)$$
(3)
$$\frac{\partial V\left(t\right)}{\partial t}=-\frac{2t}{{\tau}^{2}}{\text{V}}_{\text{O}}\mathrm{exp}\left(-\frac{{t}^{2}}{{\tau}^{2}}\right)$$
(4)
$$\omega \left(t\right)=\omega +\beta \kappa \frac{2t}{{\tau}^{2}}{\text{V}}_{\text{O}}\mathrm{exp}\left(-\frac{{t}^{2}}{{\tau}^{2}}\right)$$
(5)
$$f\left(t\right)=\frac{\alpha}{4}\frac{2t}{{\tau}^{2}}\mathrm{exp}\left(-\frac{{t}^{2}}{{\tau}^{2}}\right)$$
(6)
$${f}_{0}=\frac{\alpha}{2\sqrt{2}\tau}{e}^{-1/2}$$
(7)
$$f-{f}_{0}=\frac{{\text{P}}^{\text{+}}-{\text{P}}^{\text{-}}}{2{\text{P}}_{0}{e}^{-1/2}}\frac{\Delta F}{\sqrt{2}}$$