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The letter describes a novel hydrogen generation phenomenon observed for carboxymethyl-cellulose (CMC), used as a typical material for water-swellable tape in waterproof optical cable. A graded-index optical fibre set in CMC solution containing muddy water exhibits optical loss increase due to hydrogen gas generation, and the viscosity of the CMC solution decreases because of micro-organism decomposition.
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Koga et al. (1985) studied this question.
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