Chigo M. Okonkwo

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Single-mode fibres with low loss and a large transmission bandwidth are a key enabler for long-haul high-speed optical communication and form the backbone of our information-driven society. However, we are on the verge of reaching the fundamental limit of single-mode fibre transmission capacity. Therefore, a new means to increase the transmission capacity(More)
To unlock the cost benefits of space division multiplexing transmission systems, higher spatial multiplicity is required. Here, we investigate a potential route to increasing the number of spatial mode channels within a single core few-mode fiber. Key for longer transmission distances and low computational complexity is the fabrication of fibers with low(More)
Next-generation optical access networks should not only increase capacity but also be able to redistribute capacity on the fly in order to manage larger variations in traffic patterns. Wavelength reconfigurability is an instrument that can enable such capability of network-wide bandwidth redistribution since it allows dynamic sharing of both wavelengths and(More)
In this paper we present an in-home optical network infrastructure based on 1-mm core diameter plastic optical fibre. Both bus and star topologies based point-to-multipoint (P2MP) infrastructures to deliver ultra wideband (UWB) radio signals are presented. The system complexity and cost are compared and discussed considering real application environments. A(More)
We demonstrate a few-mode erbium-doped fiber amplifier employing a mode-selective photonic lantern for controlling the modal content of the pump light. Amplification of six spatial modes in a 5 m long erbium-doped fiber to ∼6.2  dBm average power is obtained while maintaining high modal fidelity. Through mode-selective forward pumping of the two degenerate(More)
Currently available electrical components put a limit on the maximum achievable symbol rate per channel and order of modulation for coherent optical transmission systems. Hence, future optical transmission systems are expected to utilize superchannel structure for the long-haul transmission of data rates as high as 400 Gb/s and 1Tb/s. In this paper we(More)
A simple and low cost remote up conversion (RUC) scheme is proposed using only one optical modulator. The baseband (BB) data and local oscillator (LO) signal are electrically coupled to drive a commercial intense modulator (IM). The laser source and IM can be shared by both BB data and LO signal. With less than 0.3dB power penalty, the 2.5Gbps on-off keying(More)
For in-building communication, a powerful backbone network can be created by means of optical fibre, which in a single infrastructure can offer a wealth of both fixed and wireless service connections to the users. Next to the technological challenges, important aspects to be taken into account are the economics of network installation and operation, and(More)