Yan Shi

Beyond 1 Gbit/s Transmission Over 1 mm Diameter Plastic Optical Fiber Employing DMT for In-Home Communication Systems

Multi-Gbit/s transmission over 1 mm diameter graded index plastic optical fiber (GI-POF) is reported. Transmission rates between 5.3 and 7.6 Gbit/s are achieved for fiber lengths between 10 and 50 m using discrete multi-tone modulation (DMT) in an intensity modulated direct detection system using directly modulated eye-safe VCSEL and silicon photodiode (PD). The used system bandwidth is only 1.42 GHz resulting in a spectral efficiency of bits/s/Hz. All employed components represent a low-cost, off-the-shelf cost-effective solution for high-speed in-home communication systems.

Performance Evaluation of IR-UWB in Short-Range Fiber Communication Using Linear Combination of Monocycles

We present the performance evaluation of impulse radio ultrawideband (IR-UWB) over fiber using a simple pulse design technique with a high fractional bandwidth. The technique, based on the linear combination of the first-order Gaussian derivatives with different pulse-shaping factors, shows full compliance with Federal Communications Commission mask requirements even in the most severely power-restricted GPS band. We validated our approach with experiments employing an intensity-modulation direct-detection scheme. The experimental setup uses a directly modulated DFB laser at 1302.56 nm and a multimode fiber-coupled photodetector with 24 μm diameter photosensitive area. The transmission link consists of 25 km single-mode fiber or 4.4 km multimode fiber. Error-free transmission at 2 Gb/s is achieved over both fiber links. The result shows the proposed pulse-generation technique to be simple and cost-effective compared to higher order Gaussian derivative schemes. This can be implemented successfully to distribute UWB signals over optical links for access and in-building networks.

Multistandard Wireless Transmission Over SSMF and Large-Core POF for Access and In-Home Networks

An end-to-end transmission of coexisting multistandard radio (LTE, WiMAX, and UWB) signals is demonstrated for the first time with the transmission over a combined access and in-home networks consisting of 25-km SSMF, 25-m large-core diameter polymethylmethacrylate graded-index plastic optical fiber link and 1-m wireless. The residential gateway includes O-E-O conversion to connect the access and in-home parts of the networks. This letter demonstrates a fully integrated radio signal distribution scenario from the central station to the end-user personal area networks.

Ultrawideband Signal Distribution Over Large-Core POF for In-Home Networks

A proof-of-concept real-time high definition (HD) video stream delivered over 50 m of 1 mm core diameter graded index plastic optical fiber and 3 m wireless link employing multiband orthogonal frequency division multiplexing ultrawideband (UWB) technology is studied and demonstrated. The HD video signal encapsulated into UWB frames exhibited an error vector magnitude performance of 11.9%, which is compliant with Federal Communications Commission requirements. Low-cost and off-the-shelf components were employed to realize a cost-effective solution for broadband in-home networks.

Plastic-optical-fiber-based in-home optical networks

Large-core polymethylmethacrylate (PMMA) plastic optical fiber has been recognized as a strong candidate for future in-home networks. Both economic and technical studies have shown that it can provide a cost-effective solution to address the booming capacity demand. Evolving from laboratory to trial systems with emerging and maturing POF components, Gigabit POF solutions are getting ready to be commercialized. This article overviews the state of the art of POF activities in both research and industrial aspects, and reports the latest achievements.

Distribution of Broadband Services Over 1-mm Core Diameter Plastic Optical Fiber for Point-to-Multipoint In-Home Networks

This paper presents a point-to-multipoint (P2MP) in-home optical network infrastructure based on 1-mm core diameter plastic optical fiber (POF). By employing passive POF splitters, converged broadband wired and wireless service transmission over a P2MP POF infrastructure is demonstrated. A gross 2.2 Gb/s fractional discrete multitone (DMT) and a 528-MHz ultra wideband (UWB) wireless signal distribution simultaneously to four end-users are successfully achieved with BER <; 10-3 and EVM <; 15.5% , respectively. Up to 50 m transmission distance is achieved using off-the-shelf optical components. This feasibility study on all-optical P2MP infrastructures presents a promising low-cost solution for high-speed in-home broadband communication.

In-home networks integrating high-capacity DMT data and DVB-T over large-core GI-POF.

The low-cost in-home distribution of full-standard digital TV jointly with high-bitrate data using 50 m long 1 mm core diameter graded-index plastic optical fiber (GI-POF) is proposed and experimentally demonstrated. Discrete multitone (DMT) modulation is demonstrated to provide an adaptive bitrate which can spectrally coexist with digital video broadcasting-terrestrial (DVB-T) signals in 470-862 MHz. A 3 Gb/s DMT signal and two DVB-T channels are generated, transmitted and received exhibiting excellent performance.

7.3-Gb/s Transmission Over Microstructured Polymer Optical Fiber for In-Home Networks

Polymer optical fiber (POF) links typically have a limited bandwidth due to heavy modal dispersion. In order to achieve higher data throughput, advanced signal modulation formats and transceivers have been investigated for improved spectral efficiency. However, emerging new fibers such as microstructured POFs (mPOF) can further improve transmission performance by offering a larger bandwidth at lower loss. In this letter, we report multigigabit transmission over high-bandwidth mPOF. A gross data rate of 7.3 Gb/s is achieved after a transmission length of 50 m using discrete multitone modulation in an intensity-modulated direct-detection system using a directly modulated edge-emitting laser diode at 650 nm and an avalanche silicon photodiode. The achieved spectral efficiency is 3.4 bits/(s Hz) considering the uncoded net bit rate with bit-error rate below 10-3.

Multiband LTE-A and 4-PAM Signals Over Large-Core Plastic Fibers for In-Home Networks

This letter presents the transmission of eight standard compliant 64-QAM long term evolution advanced (LTE-A) bands and 1.4 Gb/s 4-pulse amplitude modulation (PAM) signals over 20 m of 1 mm core diameter graded-index polymethyl methacrylate plastic optical fiber. The optical transceiver consists of a red light VCSEL and a p-i-n photodiode followed by a transimpedance amplifier. The LTE-A signals were transparently transmitted with the radio-over-fiber technique and without complex frequency conversion at the receiver side. A gain control technique in the digital domain was used to avoid entering the VCSEL saturation regime. Digital filtering was employed at the transmitter and receiver sides to improve the spectrum shaping of the 4-PAM and LTE-A signals. The proposed system offers a single infrastructure in-home solution capable of accommodating wired services as well as multiband LTE-A wireless services. Only low-cost components were considered in this letter in order to provide a reliable and inexpensive solution for high-capacity in-home networks.

Recent research advancements in in-building optical networks

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 sustainability. An overview is given of recent research results regarding the optimization of network architectures, and regarding advanced signal processing for economical and sustainable delivery of high-capacity wired and wireless services over various types of multimode (plastic) optical fibre.