Abstract
A scheme for transportation of information with minimum Rayleigh backscattering (RB) noise to the multi-users by employing Qdash laser diode as a source is designed and evaluated. In this paper, employing digital phase shift keying, millimeter wave, 16-quadrature amplitude modulation orthogonal frequency division multiplexing (16-QAM OFDM), and 32-QAM OFDM techniques, the data rates of 4 × 10 Gbps are transmitted simultaneously over 50 km single mode fiber, plus 15 m wireless link, 50 m free space optical (FSO) link, 10 m wireless respectively. Four selective self-injection locked modes of Qdash laser are utilized as optical carriers for downstream and upstream transmission. To ensure the matter of mitigation of RB noise, which mainly arises due to the transmission of light-wave of same wavelengths in bidirectional transportation, the carrier signals of different wavelength are used for modulation and remodulation in optical line terminal and optical network unit. Besides being a strong support to increase the tolerance level against RB noise, this architecture is capable to transmit less noisy information wirelessly in radio frequency sensitive areas too. The constancy of the proposed architecture is evaluated by very low power penalty (~ 1.5–1.7 dB, ~ 2.4–2.6 dB, ~ 1.4–1.6 dB, ~ 1.7–1.8 dB for four channels respectively), clear constellation, prominent eye opening, low bit-error-rate (< 10–9 for pseudo random bit sequence data stream and < 3.8 × 10–3 for OFDM signal) and low error vector magnitude (< 12.4% for 16 QAM, < 10% for 32 QAM). Therefore, the proposed architecture could be promising alternative not only due to the scheme for mitigation of RB noise but also be a potent in the field of applications of the communication world to provide less noisy information to the multi-users (wired/wireless/FSO).
Highlights
To fulfill the exponentially increasing demand of pressing bandwidth requirements of the users, development of passive optical network (PON) technology is a promising solution
The optical spectra of self-injection locked modes of Qdash laser with free running spectrum is presented in fig 2 and it is clear that, five spaced spectra reveal high SMSR value (>55 dB)
In summary, a novel scheme for bidirectional hybrid wavelength division multiplexing (WDM)-OFDM network for transportation of information to the multi-users with minimum Rayleigh backscattering (RB) noise is proposed and demonstrated. 4X10 Gbps data is transmitted over long distance through 50Km single mode fiber (SMF) as well as wirelessly with minimum noise by this bidirectional architecture in downlink and uplink
Summary
To fulfill the exponentially increasing demand of pressing bandwidth requirements of the users, development of passive optical network (PON) technology is a promising solution Time-division-multiplexing (TDM) and wavelength division multiplexing (WDM) technologies upgrade the PON systems for broadband services H. Yeh et al 2012, C.W. Chow et al 2013, Z. WDM, time and wavelength division multiplexing (TWDM) technologies perform even better to gratify the thirst of capacity requirements of PON systems for end users C. Mandal et al 2017), a hybrid WDM transport system plays the same role for RF, optical, and wireless based networks too due to its high speed-data rate, wide bandwidth, large coverage range (Chung Yi Li et al 2016). J. Yu et al (2008)
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