Abstract
AbstractIn this letter, the successful demonstration of a coplanar waveguide (CPW) Mach‐Zehnder (MZ) electro‐optic (EO) modulator using a strip waveguide structure is described and fabricated. The EO active hybrid material is synthesized by sol–gel process. A large EO coefficient of r33 = 50 pm/V with a long‐term stability at 80°C for 200 h was gained. It also has a controllable refractive index and permits a high‐loading concentration. A simple and easily fabricated strip‐loaded waveguide structure is designed and demonstrated to utilize the EO material, which is suitable to reduce the coupling loss with optical fiber. The measured half wave voltage (Vπ) of the CPW MZ modulator is about 8.5 V at 1550 nm in a 3.5‐cm‐long sample. The optimized design principles of the efficient transmission for such a modulator are also discussed in this letter. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2097–2100, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24546
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