This disclosure describes a biodegradable filler rod for use in trenches that house cables. The filler rod can be made from materials such as cornstarch and placed above flat fiber laid on the floor of the trench. Access to the filler rod is obtained through entry points provided in the trench. When additional fiber is to be laid in the trench, water is added to the trench which causes the biodegradable filler rod to dissolve, and a new void is created in its place. The additional fiber optic cable is rodded and placed in the void. The biodegradable filler rod provides cost savings for network capacity expansion projects without additional surface area requirements.
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Korman, John; Cox, D. Clay; and Walsh, David, "Biodegradable filler rod", Technical Disclosure Commons, (April 27, 2018)