FIBER OPTIC COMMUNICATION SUBSYSTEMS, NAMELY, RAMAN PUMP MODULES, DISPERSION-COMPENSATION MODULES, TRANSMITTERS, RECEIVERS, ADD DROP MODULES, ADD/DROP MULTIPLEXES, OPTICAL CROSS-CONNECT SWITCHES, POLARIZATION MODE DISPERSION COMPENSATORYS; CIRCUIT PACKS, NAMELY OPTICAL AMPLIFIER CIRCUIT PACKS, DISPERSION COMPENSATION CIRCUIT PACKS, ADD/DROP MULTIPLEXED CIRCUIT PACKS, TRANSMITTER CIRCUIT PACKS, RECEIVER CIRCUIT PACKS, OPTICAL CROSS-CONNECT SWITCH CIRCUIT PACKS, AND POLARIZATION-MODE DISPERSION COMPENSATORY CIRCUIT PACKS
Electrical and Scientific Apparatus