Abstract
We present a simultaneous radio-frequency (RF) and high-speed baseband signal transmission using an electrically superimposed method over a graded-index silica multimode fiber (GI-MMF). To show the feasibility of the method, we experimentally demonstrate simultaneous transmission of electrically superimposed 28-GHz RF and 28-Gbit/s 4-level pulse amplitude modulation (PAM-4) baseband signals at a wavelength of 850 nm over a 50-m GI-MMF. Moreover, to evaluate the scalability of the method, we demonstrate simultaneous transmission of dual-channel, electrically superimposed 28-GHz RF and 14-Gbit/s non-return-to-zero on-off keying baseband signals at 850 nm and electrically superimposed 14-GHz RF and 14-Gbit/s PAM-4 baseband signals at 1550 nm over the 50-m GI-MMF. These results show that the presented method is useful for effectively utilizing the transmission band of transmitters and existing short-reach transmission systems.
Highlights
Internet traffic generated by wireless devices has been increasing rapidly
The transmitter was directly connected to PD1 without inserting the 50-m graded-index silica multimode fiber (GI-multi-mode fibers (MMFs))
The spectrum dip at 14 GHz was mainly induced during the E/O conversion process owing to the nonlinearity of I-L characteristics of the vertical cavity surface emitting laser (VCSEL)
Summary
Internet traffic generated by wireless devices has been increasing rapidly. According to the Cisco Visual Networking Index Forecast, the data traffic of mobile and wireless local area networks will comprise more than half of the global IP traffic in 2021 [1]. As the main part of the data traffic is generated by smartphones and tablets, they must be connected to outdoor as well as indoor locations such as in-home networks. To provide a broader frequency band, super-high frequency (3 to 30 GHz) bands will be used for the fifth generation (5G) mobile network. The accelerating demand for broadband wired service using high-speed baseband signals such as on-off-keying (OOK) and 4-level pulse amplitude modulation (PAM-4) signals, makes them indispensable for future wired in-home networks. Simultaneous wired and wireless transmission using a simpler and more cost-effective solution will be a key technology to provide wired and wireless multi-services in such networks
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