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Mitsubishi Electric's optical transmission technologies enable 100 Gbps optical transmission per wavelength thanks to its newly developed integrated optical transmitter module and optical transceiver, which are installed to 100 Gbps optical transmission equipment. Transmission capacity per power consumption is 40% more efficient compared to existing devices due to effective integration of the optical module and other key components.

1)	Optical Transceiver for 100 Gbps long-haul transmission Digital coherent technology realizes high spectral efficiency with polarization multiplexing and quaternary phase-shift keying. Soft-decision forward error correcting technology enables transmission beyond 1,000 km. The number of 100 Gbps channels is increased by 40% compared to conventional 100 Gbps technology.
2)	Integrated optical transmitter module for compact 100 Gbps optical transmission device Optical integration reduces device dimensions by 80% and power comsumption by 22% compared to existing models. The four optical transmitter modules, four driver ICs and wavelength multiplexers are integrated in one package. Communication traffic is rapidly growing with the spread of smartphones and increased video streaming services. In response, the demand for greater capacity in inter-city backbone networks is rising. Compactness and energy efficiency are also key issues due to the need to install communication equipment in limited spaces.

Development overview

Equipment		Specification	New	Conventional	Improvement
100Gbps Optical Transmission Device		Transmission capacity	100 Gbps	40 Gbps	2.5 times faster 20% more efficient
		Power efficiency	0.66 Gbps/W	0.55 Gbps/W
	100 Gbps Optical Transceiver	Transmission capacity	100 Gbps	40 Gbps	2.5 times faster
		Modulation format	Polarization multiplexed quadrature phase-shift keying	Differential binary phase-shift keying	-
		Detection scheme	Coherent detection	Direct detection	-
	100 Gbps Integrated Optical Transmitter Module	Transmission capacity	100 Gbps	40 Gbps	2.5 times faster 22% reduction
		Power	efficiency	7 W	9 W

Note: 56 patents are pending in Japan and 31 overseas.

This work is partly supported by the Japanese Ministry of Internal Affairs and Communications' R&D project for digital coherent optical transceiver technologies and high-speed optical edge node technologies.