Electrooptic polymer-based modulators have been investigated intensively due to their potential applications in optical communication systems. In this paper, we report a polymeric modulator with a domain-inverted Y-coupler configuration. Both of the modulation depth and linearity were improved due to the novel device structure. The Y-coupler modulator was automatically set at 3dB point with no need of DC bias, which eliminate the DC drift phenomena in Mach-Zehnder or co-direcitonal modulators. At the same time, a domain- inversion poling technique was developed, which can be used to fabricate other type of active EO devices in the future.
A linearized external electro-optic modulator with a number of parallel Mach-Zehnder interferometers cascaded via directional couplers is proposed. Fast-Fourier-Transform method is used to analyze both the third harmonic spurious signal and the third intermodulation distortion. By adjusting the number of Mach- Zehnder interferometers contained in the modulator, the linearity of the transfer curve of the modulator can be modified while obtaining nearly 100% optical modulating depth. The modulator is based on an innovative domain-interval electro-optic polymer film, where the two arms of each Mach-Zehnder interferometer are inversely poled. As a result, only one driving voltage is required upon a pair of uniform traveling-wave electrodes, for high-speed operation.
An electro-optic polymer with photolime gel and chlorophenol red dye is prepared using a newly developed mixed solvent of water and ethyline-glycol. This new solvent not only prevents the EO chromophore from re-crystallization, but also help the guest and host materials to mix well in the molecular level. As a result, high EO coefficient of 40 pm/v has been obtained with improved stability of EO effect. A new pulsed poling technique is developed, which increase the poling efficiency up to 35% compared with the traditional parallel-plate poling method.
Optical amplification and electro-optic modulation have been observed simultaneously in one polymeric material photo-lime gel which has been used as a volume holographic material to produce dichromated gelatin (DCG) films. In this paper, the dual functions were achieved by doping neodymium chloride hexahydrate (NdCl3(DOT)6H2O) and chlorophenol red (C19H12Cl2O5S). The optimized doping concentrations of Nd+3 and chlorophenol red were 6.7 X 1019/cm3 and 23% respectively. We observed a gain of 3.8 dB at 1.04 micrometers and an electro-optic coefficient of 30 pm/V at 633 nm. The experimental results confirms that the co-doping process does not degrade the respective functions of Nd+3 for optical amplification and chlorophenol red for electro-optic modulation.
Directional couplers with four sections poled in four perpendicular directions are proposed for the first time as a new electro-optic switch configuration in which complete conversion of both TE and TM light from one waveguide to the other can be achieved simultaneously by a low driving voltage adjustment. The perpendicularly poled sections of the switch make the device completely polarization- independent, and the inversely poled sections offer an extremely relaxed fabrication tolerance for the device. This configuration of each section poled in a different direction also makes it possible to drive the electro-optic coupler with a uniform electrode, which ensures high-speed operation of the device. Both the switching characteristics and the fabrication tolerance are simulated.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.