An optical receiver comprises a PD for receiving an incident light from an optical fiber, a preamplifier IC for amplifying an electrical signal from the PD, a submount on which the PD and the preamplifier IC are mounted on the same plane, and a package on which the submount is mounted. Each unique application verification data element corresponds to at least one of the plurality of approved executable programs. Kits containing reusable spark plug boots with cooperating spark plug boot puller tools are provided.