Electromagnetic shielding of plastic packaging in low-cost laser modules

Low-cost MiniDIP laser modules fabricated by plastic moulded technology fil led with highly conductive materials are proposed for the evaluation of ele ctromagnetic interference (EMI) shielding effectiveness (SE). The SE of con ductive plastics was measured to be 45dB at 30MHz and 62dB at 1GHz. The las er modules have a transmission speed up to 622 Mbit/s and > 1mW fibre outpu t power. With these excellent SEs and good optical characteristics, such pl astic MiniDIP laser modules;fire suitable for use in low cost OC-12 lightwa ve transmission systems.