EO Polymer-based Bias-Free Highly-Linear Domain Inverted Directional Coupler
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Abstractprovide a linear modulation curve good enough for a high spurious free dynamic range (SFDR) for RF photonics. In Conventional Mach Zehnder (MZ) modulators achieves a low driving voltage V to 1 volt but fails to this program, Omega Optics proposes a 1x2 Y-fed directional coupler together with a multiple domain inversion poling technique, which is exclusively available for EO polymer thin film. The 1x2 Y-fed configuration provides us with a bias-free approach while the multiple domain inversion provides the linear transfer curve with SFDR well above 121 dB/Hz, which is well above that can be provided by MZ modulator. With the availability of MORPH EO polymer having an ?33 as large as 300pm/V at 1.3 m, V < 1 volt can be easily achieved. More importantly, more sections of domain inversion can be realized to further upgrade the linearity of the transfer curve which creates significant improvement of the SFDR that is not achievable through other competing technologies. In Phase I, we will demonstrate a domain inverted polymer waveguide modulator with projected linearity and device insertion loss with a detailed plan of phase II demonstration. A traveling-wave MORPH EO polymer based modulator with 40 GHz bandwidth and fiber to waveguide coupling loss at <0.7 dB/facet will be demonstrated in phase II.
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