W-band radio-over-fiber propagation of two optically encoded wavelength channels

Abstract

, "W-band radio-over-fiber propagation of two optically encoded wavelength channels," Opt. Eng. 57(1), 016104 (2018), doi: 10.1117/1.OE.57.1.016104. Abstract. We propose a W-band wavelength-division multiplexing (WDM)-over-optical code-division multiple access radio-over-fiber system. This system offers capacity expansion by increasing the working frequency to millimeter wave region and by introducing optical encoding and multiwavelength multiplexing. The system's functionality is investigated by software modeling, and the results are presented. The generated signals are data modulated at 10 Gb∕s and optically encoded for two wavelength channels and transmitted with a 20-km length of fiber. The received signals are optically decoded and detected. Also, encoding has improved the bit error rate (BER) versus the received optical power margin for the WDM setting by about 4 dB. In addition, the eye-diagram shows that the difference between received optical power levels at the BER of 10 −12 to 10 −3 is about 1.3% between two encoded channels. This method of capacity improvement is significantly important for the next generation of mobile communication, where millimeter wave signals will be widely used to deliver data to small cells.

Expandable high-capacity wavelength division multiplex-over-optical code division multiple access millimeter wave radio-over-fiber system

“…In this method, the optical encoding applied on the optical signal serves both for capacity expansions by accommodating more users per channel based on the number of optical codes and for the enhanced security of each user's signal as it would be only decoded with a correct corresponding optical code at the decoder. [24][25][26][27][28][29][30][31]32,23 Optical encoding/decoding is degrading the performance of the system in general when encoding the signal of each user; the bandwidth of the signal increases as it has to be expanded (spread) according to the OCDMA scheme. Thus, the bandwidth efficiency decreases when encoded signals are transmitted.…”

“…simultaneously. 29 In this paper, we present a system where the data from 18 users are encoded using a seven-chip quaternary phase shift (QPS) code in a superstructure fiber Bragg grating (SSFBG). Then, they are transmitted over three wavelength channels (six users per each wavelength at C-band), multiplexed through a fiber with 20 km of length to the receiving side.…”

Creation of an engineering course: design and simulation of high-capacity fiber optic systems utilizing VPI-photonics

“…At the same time, while fiber-optic technology can provide tremendous bandwidth (capacity) [2], [3] low signal attenuation and high security, it does not support mobility. Thus, the combined use of fiber optics for point-to-point communications and radio frequency (RF) waves for short-range wireless communications can provide high capacity along with mobility [4], [5], [6], [7], [8].…”

“…For high capacity transmissions, use of broadband fiber optic communication systems such as wavelength division multiplexing (WDM) systems are continuously advancing due to the spread of technologies that support it [6], [7]. Hybridization of various techniques, such as radio-over-fiber along with new modulation techniques, increases the capacity of fiber optic networks to fulfill the capacity requirements of the next generation of mobile communication (5G).…”