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Photo-stability measurements of electro-optic polymer inverted ridge waveguides, fabricated from AJ-CKL1, AJ416 and LPD-80, are conducted up to 30, 100, and 100 mW of input power coupled into the waveguides respectively. These experiments are performed in a N2 atmosphere to exclude absorbed O2. AJ416 and LPD-80 are found to be stable up to at least 1 MW/cm2 at 1550 nm. In contrast, photo-degradation was observed in an ambient atmosphere with 1 mW (LPD-80) and 10 mW (AJ-CKL1) coupled into the waveguides.