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We have measured the optical phase sensitivity of fiber based on poly(methyl methacrylate) under near-single-mode conditions at 632.8?nm wavelength. The elongation sensitivity is 131±3×10^5?radm^?1 and the temperature sensitivity is ?212±26?radm^?1K^?1. These values are somewhat larger than those for silica fiber and are consistent with the values expected on the basis of the bulk polymer properties.