Experimental demonstration of high spectral-efficiency transmission with a novel non-interferometric vector modulator and custom DSP algorithms for coherent PON architectures (original) (raw)
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International Journal of Electrical and Computer Engineering (IJECE), 2018
The explosive demand of broadband services nowadays requires data communication systems to have intensive capacity which subsequently increases the need for higher data rate as well. Although implementation of multiple wavelengths channels can be used (e.g. 4 × 25.8 Gb/s for 100 Gb/s connection) for such desired system, it usually leads to cost increment issue which is caused by employment of multiple optical components. Therefore, implementation of advanced modulation format using a single wavelength channel has become a preference to increase spectral efficiency by increasing the data rate for a given transmission system bandwidth. Conventional advanced modulation format however, involves a degree of complexity and costly transmission system. Hence, carrierless amplitude phase (CAP) modulation format has emerged as a promising advanced modulation format candidate due to spectral efficiency improvement ability with reduction of optical transceiver complexity and cost. The intriguing properties of CAP modulation format are reviewed as an attractive prospect in optical transmission system applications.
Coherent 16 Quadrature Amplitude Modulation (16QAM) Optical Communication Systems
PHOTONICS LETTERS OF POLAND, 2018
Coherent optical fiber communications for data rates of 100Gbit/s and beyond have recently been studied extensively primarily because high sensitivity of coherent receivers could extend the transmission distance. Spectrally efficient modulation techniques such as M-ary quadrature amplitude modulation (M-QAM) can be employed for coherent optical links. The integration of multi-level modulation formats based on coherent technologies with wavelength-division multiplexed (WDM) systems is key to meeting the aggregate bandwidth demand. This paper reviews coherent 16 quadrature amplitude modulation (16QAM) systems to scale the network capacity and maximum reach of current optical communication systems to accommodate traffic growth.
Design and Implementation of Various Advanced Modulation format over 8-WDM Bidirectional PON
With the growing demand for users higher speed reliable data transmission become the great need for the users. For the higher bit rate and flexible bandwidth wavelength Division Multiplexing (WDM) network is one of the best solutions. The performance of WDM mainly depends upon factor such as modulation format used in the networks. In this paper comparison of various Advanced Modulation Formats has been carried over the 8 channel Bidirectional WDM PON. Fiber without having amplifier and Dispersion compensating fibers. A network without any amplifier and repeaters reduces the network operation effectively, thus simplifying system configuration and maintenance cost. Hence, the system performance is not increased by using any sort of amplifiers and DCF. The designed system has achieved a maximum transmission distance of 120 km at the power of 0-2 dbm over Bidirectional Multi-mode fiber. This simulation work has done in opt system 14.1 suite Software. Keyword: PON (Passive Optical Network), DCF (Dispersion Compensation Fiber), MZI (Mach Zehnder Interferometer), OLT (Optical Line Terminal), ONU (Optical Network Unit, WDM (Wavelength Division Multiplexing, MMF (Multimode Fiber). 1. INTRODUCTION With the advancement of the communication systems, there is a need to send more data at a higher speed that provide higher security, strength, and speed with seamless connectivity [1]. The conventional ways to fulfil this requirement is to form a physical connection between the users in wired communication. In wired communication, the data is transmitted through the medium such as twisted pair cable, Co-axial cable and optical fiber cable [2]. Optical fiber cable is used as it offers a much more promising solution than the other two. It uses the principle of Total Internal Reflection and covers larger distance with larger bandwidth and high data rate [3].Optical cables used for the purpose of computer networking and other uses such as file sharing technology, surfing internet, telecommunication and watching TV etc. [4]. Increasing demands due to rapid population growth has boosted the advance modulation formats to increasing transmission capacity. Higher capacity can be achieved by multiplexing the input signal by multiplexing the input signal but there are certain modulation formats which along with increasing capacity can also improve the signal performance at the output. Some of the advanced modulation formats such as NRZ, RZ, CSRZ, and MDRZ which can be used for bandwidth utilization of fiber. So to achieve this need we have designed 8 Channel Bidirectional WDM PON based system which will be discussed in the next section. Bi-directionality of an optical fiber further increases the network capacity [5]. The Passive Optical Network (PON) is a network, which carries data in the optical domain between the OLT and ONU with a passive transport path of the optical signal. Between the transmitter and receiver, the optical network devices used as non-powered i.e. no electrical devices are used. " The basic principle of PON is to share the central Optical Line Termination (OLT) and fiber over as many Optical Network Units (ONUs) as is practical given cost effective optics [6]. "