Bidirectional Optical Fiber Research Articles

Performance analysis of NGPON using hybrid GPON-XGPON based robust long-haul passive optical communication network

Abstract For high data rates and extended reach capabilities, communications networks need to be enhanced by employing passive optical networks (PONs). NG-PON plays a key role in achieving the modern demands. This paper proposed novel hybrid G-PON and XG-PON based robust long-haul Passive Optical Communication Network. In this proposed network hybrid semiconductor optical amplifier (SOA) and EDFA are used to enhance the system performance for downstream (D.S.) and upstream (U.S) signals transmission. This paper analyses a hybrid G-PON and XG-PON bi-directional optical fiber link up to length of 100-km with a 128 (1:64 and 1:64) way-splitter to increase the coverage area and to enhance the quality of transmitted data. The qualitative analysis of the proposed network shows an improved performance in terms of transmission distance, quality factor and eye-diagrams.

A new full-duplex analog RoF transmission system for 5G/5G+ broadband mobile communication

Abstract A new cost-effective mobile fronthaul architecture has been proposed by designing promising analog radio over fiber (ARoF) transmission system compliant with the next generation ultra-dense wavelength division multiplexing passive optical network (UDWDM-PON). It is conceived for standalone 5G/5G+ mobile communication systems driven by broadband multi-input multi-output (MIMO) millimeter wave data signals using two high spectral efficient modulations. The feasibility of the proposed system was firstly proven in terms of spectral tracing supported by theoretical analysis that disclosed good agreement. Furthermore, the obtained simulation results regarding the system performance evaluation after 22 km bidirectional optical fiber links were revealed high reliable characteristics including error-free transmissions at low receiver sensitivities, and measured power penalties less than 1 dB. In addition, the recovered eye diagrams maintained wide openings with high-quality patterns.

A Research on Bi-directional Double Clad Optical Fiber for 5G Communication with Multiband Radio Signal and Power for Disaster Management in Remote Units

A Research on Bi-directional Double Clad Optical Fiber for 5G Communication with Multiband Radio Signal and Power for Disaster Management in Remote Units

An Improved Hybrid WDM/TDM PON Model with Enhanced Performance Using Different Modulation Formats of WDM Transmitter

Abstract In this paper, we have proposed an improved hybrid passive optical network model using wavelength division multiplexing (WDM) and time division multiplexing (TDM) with 96 users in the bidirectional optical fiber networks. The performance is evaluated based on different distances and modulation formats with the help of Q factor, BER and Eye diagram. In the proposed model, the data is successfully transmitted up-to a distance of 96 km with a data rate of 10 Gbits/sec. Comparative analysis of proposed models with respect to other four models are hence put forth.

Optical Multi-Wavelength Source for Single Feeder Fiber Using Suppressed Carrier in High Capacity LR-WDM-PON

In this paper, a novel cost-effective optical multi-wavelength generation scheme based on a pulsed laser and a single Mach-Zehnder modulator (MZM) is proposed. Over 50 wavelengths has been achieved with the proposed cost-effective scheme among which 37 wavelengths were selected for transmission because of their small amplitude excursions between the wavelengths and high tone-to-noise-ratio of over 40dB. Frequency spacing is kept at 12.5 GHz, where 10-Gb/s data-based differential phase shift keying (DPSK) modulation technique is utilized for downlink (DL) transmission across each wavelength in single feeder fiber (SFF) wavelength-division multiplexed-passive optical network (WDM-PON), and the results are examined for 25 and 50-km SFF. In SFF, uplink (UL) transmission can be impaired by Raleigh backscattering (RBS) noise. In this scheme, the RBS noise is alleviated at ONU side with the help of carrier suppression by utilizing non-return-to-zero (NRZ) dual port (DP) dual drive (DD) MZM modulation technique, where both the DL and UL transmissions are merged by using optical circulators without using a dispersion compensating fiber. At the receiver side, the signals are identified with the help of optical filters and divided in two halves using 1×2 forks, half of which is received and demodulated using DPSK receiver, whereas the other half of the transmitted signal is re-modulated with the help of a single 10-Gb/s NRZ-DPDD-MZM modulation technique for UL transmission. Overall, 740-Gb/s data has been transmitted across 25 and 50-km bidirectional optical fiber for DL and UL transmission. The proposed scheme is analyzed in terms of bit error rate of 10e <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-9</sup> , power penalties (PP), and eye diagrams (ED). It is found that the observed PPs are negligible, and wide openings of the EDs satisfies that the proposed scheme is worth consideration for deployment in long reach WDM-PON.

A Survey on Performance Analysis of different Multiplexing Scheme used in Passive Optical Network System

this research Paper review on various multiplexing techniques used for particularly in optical communication to fulfill the demand of modern technology. Sharing of photonics in development of the physical layer within the future web can most likely increase. The photonics leads currently to a more robust usage of the out there information measure, increase within the transmission rate, increase in energy/power capability measured in W/Gbps, etc. In SCM a single link of transmission medium, there'll be many numbers of transmitters is joined. Every transmitter was tempted to sending information and different types of data simultaneously. We have demonstrated a bidirectional Optical fiber system based on a reflective semiconductor optical amplifier (RSOA) using different modulation technique according to the system. The Optical fiber system was modeled and simulated using commercial software, which is Opti-system 7.0 from Optiwave.

Simulative analysis of co-existing 2.5 G/10 G asymmetric XG-PON system using RZ and NRZ data formats

In this paper, a fiber optic communication system has been employed using co-existing 10G/2.5G asymmetric gigabit passive optical network (XG-PON) architecture. In this system, bidirectional optical fiber has been used for upstream and downstream data transmission. The system performance has been investigated for non-return-to-zero (NRZ) and return-to-zero (RZ) data formats operating at varying bit rates by varying the length of the fiber for analyzing the feasibility of this co-existence. The results have been compared for NRZ and RZ formats for upstream and downstream data in terms of Q value and eye opening. It is observed that RZ modulation format is superior as compared to conventional NRZ format and the faithful transmission of signal has been carried up to 90km at 1577nm for downstream and 140km at 1270nm for upstream.

双向光纤环形混沌激光器相邻帧相似性的实验研究

双向光纤环形混沌激光器相邻帧相似性的实验研究

Performance Analysis of 10G/2. 5G Asymmetric XGPON Transmission using RZ and NRZ Data Formats

In this paper, a fiber optic communication system has been employed using 10G/2.5G asymmetric XGPON architecture. In this system bidirectional optical fiber has been employed for upstream and downstream data transmission. The system performance has been investigated for non-return-to-zero (NRZ) and return-to-zero (RZ) data formats by varying the length of the fiber for co-existed GPON and XG-PON system. The results have been compared for NRZ and RZ formats for upstream and downstream data in terms of Q value and eye opening. It has been observed that RZ modulation format is superior compared to conventional NRZ modulation.

Using M-QAM-OFDM in Downstream Link and WBTW-SOA in Upstream of a Bidirectional WDM-PON System

The passive optical network WDM-PON is one of the most dominant performers of all communication systems, and provides sufficient broadband service. Providing enough data for the demands of today and the future, marks this area as a critical topic for researchers. The first goal of this article is to study the performance of OFDM in a bidirectional WDM-PON by using QAM and BPSK modulation methods in the downstream link. The second goal is to build the upstream link with WBTW-SOA and show its ability to transmit the upstream signal with low equipment. Sending and receiving signals from the central office to the last mile, and opposite of the network up to 100 Km via a bidirectional single mode optical fiber (SMF) was successfully achieved.

Radical detection in harsh environments by means of laser-induced fluorescence using a single bidirectional optical fiber

A new experimental method is described enabling detection of hydroxyl radicals (OH) by laser-induced fluorescence in high-temperature gas-phase reactions. This is accomplished by means of a bidirectional optical fiber probe, which is of interest for applications where optical access is limited. An optical setup that allows simultaneous excitation and detection of fluorescence using one and the same fiber has been developed. Complications resulting from coupling as well as laser-induced scattering are addressed, and different fibers are compared with regard to core material composition and geometric collection efficiency. On this basis, a suitable fiber is identified, and OH detection and profile measurements are demonstrated in a premixed laminar flame as reference experiment.

A new type of bidirectional long distance optical fiber chaotic secure communication system

Based on the chaotic synchronization of two response semiconductor lasers (RLs) under the injection from a common chaotic signal of a drive laser (DL), a new type of secure communication system, which allows bidirectional and long-distance information transmissions, is proposed. A corresponding theoretical model is established to study the bidirectional transmission performance, security performance and the system performance under different transmission distances. The results show that when two RLs receive chaotic light injected from a DL, the chaotic outputs of two RLs achieve a fairly good isochronal synchronization without any time delay, while there is a big difference between the signals of RLs and the signal of DL; the system owns high security level after having analyzed the various ways from which eavesdropper may obtain message; if the ordinary single mode optical fiber is used as a transmission channel, the Q factor of decoded message can reach more than 6 after a propagation over 50km; if the dispersion-shifted fiber is employed, the Q factor of decoded message can still reach more than 6 after a propagation over 200km.

Bidirectional WDM–PON architecture using a reflective filter and cyclic AWG

We proposed and demonstrated a bidirectional SCM–WDM PON using a reflective filter and cyclic AWG where up/downlink data could be provided using a single optical source. In the proposed scheme, the signal for downstream was modulated by a single CW laser diode and remodulated in the optical network unit as an upstream, the proposed WDM–PON scheme can offer the SCM signal for broadcasting service. In this paper, 1 Gb/s signals both for up- and downstream were demonstrated in 10 km bidirectional optical fiber link.

Versatile high performance digital SQUID electronics

The digital SQUID Electronics DSE32 has been developed to perform software gradiometry with SQUID magnetometers in multi-channel systems using both High-T/sub c/ and Low-T/sub c/ SQUIDs. A low-noise preamplifier is followed by a fast hybrid feedback-loop, combining the bandwidth of an analog feedback-loop with the accuracy of a digital loop. By resetting and counting of flux quanta in the SQUID, the dynamic range has been substantially increased. All parameters of SQUID and electronics are firmware controlled and allow for auto-setup and tuning. Data are transferred with a rate of 20 Mbit/s by means of noise-minimizing, bi-directional optical fiber. Low power consumption allows the use of a battery, further reducing external noise pick-up. The electronics layout is designed for multi-channel applications, as needed in biomagnetic systems.

Development of battery charging system for the FE gun system of HVEM

We have developed a reliable and efficient battery-charging system for the field emission (FE) gun system of high voltage electron microscopes, where the operating condition of the whole FE gun system can be controlled and monitored through a bi-directional optical fiber system, and the control and monitoring circuits located on the high potential of 1 MV are driven by rechargeable Ni-Cd batteries. The power transmission from ground to the high potential is performed through filter condenser circuit. Under the condition that the filter condenser current is limited to 0.2 A(rms) (root-mean-square value), it is possible to transmit the maximum power as high as 65 W, which is enough for the daily operation of the FE gun system. The charging circuit has a function of protecting the batteries from over-charging.

通信線搬送装置を用いた双方向SM光ファイバSSBデータ通信システム

通信線搬送装置を用いた双方向SM光ファイバSSBデータ通信システム

Noise properties of a bidirectional optical fiber transmission system using Raman amplifers

Abstract Noise properties of a bidirectional optical fiber transmission system using Raman amplification are analyzed. Analytical expressions for both forward and backward amplified spontaneous emission (ASE) noise are established in terms of system parameters. The signal to ASE noise ratio (SNR) and the achievable repeater length are discussed. Based on the results, we find that there exist optimum pump and initial power levels for the maximum SNR and repeater spacing. The maximum system transmission length and accumulated ASE noise for a multiple‐amplifier system are calculated. A maximum system transmission length up to 5,000 km with 12 dB SNR is then predicted.

Bidirectional optical fiber transmission systems using Raman amplification

Bidirectional optical fiber transmission systems using Raman amplification are discussed. Analytical expressions for signals amplified by both forward and backward Raman scattering are presented. It is found that there exists an optimal pump power for the maximum unrepeated transmission length in a bidirectional system and that the maximum length is about 450 km, which is about the same as that of the unidirectional system.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Observation of coherent Rayleigh noise in single-source bidirectional optical fiber systems

The authors report noise in a directional optical fiber system that they believe arises from the interference of the signal light with the Rayleigh backscattered light. This noise, called coherent Rayleigh noise (CRN), is the dominant noise source in this system. The interference provides a mechanism for translation of laser phase fluctuations into receiver photocurrent fluctuations. A number of noise reduction schemes are proposed. The authors demonstrate that CRN can be reduced, but not eliminated, by providing a small drive current modulation signal to the source laser to broaden its linewidth. Systems using this single-source-bidirectional architecture must take this noise source into account.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Bidirectional Digital Optical Fiber System with Transmitters Synchronized with Receivers

Bidirectional Digital Optical Fiber System with Transmitters Synchronized with Receivers