Components for optical communication, namely, optical amplifiers, attenuators, demultiplexers, integrated circuit chips for use as laser diode drivers, integrated circuit chips for use as transimpedance amplifiers for photo detectors, lasers not for medical use but for telecommunication and amplification, light emitting diodes, multiplexers, optical filters, optical lenses, receivers to receive light, namely photo detectors, semiconductor chips, semiconductor devices, semiconductors, telecomm...