Wdm Research Papers - Academia.edu (original) (raw)

This paper reports the effects of pre- and post-compensation using CRZ modulation format in long-haul WDM optical transmission link using wavelengths in three bandwidths viz. 1537.4; 1550; 1562.6 nm at per channel bit rates of 10 Gbit/s.... more

This paper reports the effects of pre- and post-compensation using CRZ modulation format in long-haul WDM optical transmission link using wavelengths in three bandwidths viz. 1537.4; 1550; 1562.6 nm at per channel bit rates of 10 Gbit/s. It has been investigated here that optimization of dispersion map results in improved management of nonlinear effects in long-haul light wave systems operating in the quasi-linear regime. In addition, pre- and post-dispersion compensation was applied at the transmitter and receiver depending on the signal wavelength, which resulted in improvement of performance metrics viz. Q2 (dB), BER and OSNR over longer transmission distances. It is reported here that optimum values of Q2 dB of 17.1 dB, BER of 8.4933e−015 and OSNR of 30.1 dB are obtained at 1550 nm at a transmission distance of 7360 km with pre- and post-compensation using CRZ modulation format.

Future avionics systems will require high-bandwidth on-board communication links that are lightweight, immune to electromagnetic interference, and highly reliable. Fiber optic communication technology can meet all these challenges in a... more

Future avionics systems will require high-bandwidth on-board communication links that are lightweight, immune to electromagnetic interference, and highly reliable. Fiber optic communication technology can meet all these challenges in a cost-effective manner. Recent advances in fiber optic technology, especially wavelength division multiplexing (WDM), have opened a number of possibilities for designing on-board fiber optic networks for radar and avionics RF signal distribution. In this paper, we investigate a number of different novel ...

El continuo crecimiento de la demanda de datos está dirigiendo la investigación para dar luz a una red eficiente en el uso de la fibra óptica y el espectro radioeléctrico. La próxima generación de redes será el resultado de una... more

El continuo crecimiento de la demanda de datos está dirigiendo la investigación para dar luz a una red eficiente en el uso de la fibra óptica y el espectro radioeléctrico. La próxima generación de redes será el resultado de una convergencia entre el dominio óptico e inalámbrico para reunir cada una de sus virtudes en una vasta red de telecomunicaciones más resiliente y más simplificada. Colombia no estará marginada de estos avances ya que actualmente despliega fibra óptica por gran parte del territorio nacional y por tal motivo debe estar informada de los progresos actuales en lo referente a redes de telecomunicaciones de nueva generación y orientar de mejor forma los lineamientos legales del ministerio de TIC (Tecnologías de la Información y las Comunicaciones) para traer en consecuencia grandes beneficios a la regulación de la red interna de telecomunicaciones en cuanto a lo decretado acerca de los inmuebles de propiedad horizontal. En este trabajo se plasman los avances en invest...

This research was conducted to develop a 1×12 optical splitter based on polymer optical fiber (POF) made from polymethyl methacrylate (PMMA) material as a high efficiency optical signal transmission medium. Basically, the optical device... more

This research was conducted to develop a 1×12 optical splitter based on polymer optical fiber (POF) made from polymethyl methacrylate (PMMA) material as a high efficiency optical signal transmission medium. Basically, the optical device has 1 POF input port and 12 POF output ports in a bundled fiber form. There are several system available in the market which are able to split or couple optical signals transmitted into some different channels, which are all afflicted with certain constrains. However, these systems are too expensive for most applications. The goal of this research was to develop an economical splitter for multi-purpose application over PMMA-POF. Red LED with 650 nm wavelength was injected into the splitter with the aim to analyze the power efficiency of the splitter. A coupling efficiency of 80% was demonstrated. The performance of these hand-made splitters can be improved gradually through experience and practice.

— Geometric camera calibration, additionally alluded to as camera re sectioning, evaluating the parameters of a lens and picture sensor of a picture. Camera parameters can be utilized to correcting the distortion, and measuring the object... more

— Geometric camera calibration, additionally alluded to as camera re sectioning, evaluating the parameters of a lens and picture sensor of a picture. Camera parameters can be utilized to correcting the distortion, and measuring the object size in world unit, or knowing the camera position in the scene. Zhang's calibration method is utilized, the method require a chessboard planner with resolution 1830×1330 pixels to be observed from different orientations and translations also using 2 nd order radial distortion of the polynomial expression. The result shows that lens of longer focal length generate low distortion and it is the better lens as contain minimum value of SSE equal to 3.96426 pixels.

This study presents second generation low-cost fused tapered (LFT) 1 × 3 splitter (G2) as novel, low-cost and low-losssplitting device made from PMMA-based polymer optical fiber (POF). G2 (short taper, 0.5 - 2.0 cm) was fabricated... more

This study presents second generation low-cost fused tapered (LFT) 1 × 3 splitter (G2) as novel, low-cost and low-losssplitting device made from PMMA-based polymer optical fiber (POF). G2 (short taper, 0.5 - 2.0 cm) was fabricated byreformulated handwork fusion method using candle and metal tube. A new process, twisting-effect removal, is addeed to refineripple surface in fused input fiber. LED fiber source (wavelength 650) was injected into input fiber while optical power in outputfibers was measured by optical power meter. Insertion loss (7 dB) and excess loss (0.53 dB) for G2 are extremely low. G2 arehomogenous splitters since their splitting ratio are very close to 33:33:33% with ± 5% of tolerance.

This paper focuses on survivable optical networks and studies in detail the network performance improvement that can be achieved when jointly considering network resilience and physical layer constraints. The protection scheme used is... more

This paper focuses on survivable optical networks and studies in detail the network performance improvement that can be achieved when jointly considering network resilience and physical layer constraints. The protection scheme used is path-based shared protection known as backup multiplexing. In the proposed solution routing and wavelength assignment for both primary and protection paths are jointly performed considering their physical performance. Simulations comparing the proposed solution with alternative schemes ...

Wavelength-division multiplexing (WDM) holds great promise for achieving large-scale concurrency on a single fiber. However, standard multichannel approaches have two serious drawbacks when applied to lightwave networks: 1) they require... more

Wavelength-division multiplexing (WDM) holds great promise for achieving large-scale concurrency on a single fiber. However, standard multichannel approaches have two serious drawbacks when applied to lightwave networks: 1) they require wavelength-agile transmitters or receivers, and 2) pre- transmission coordination between two users wishing to communicate is required. In this paper, we propose a multihop WDM approach, referred to as ShuffleNet, for achieving con currency in distributed lightwave networks. A ShuffleNet can be configured with each user having as few as one fixed-wavelength transmitter and one fixed-wavelength receiver, avoiding both wavelength-agility and pretransmission-coordination problems. Still, the network can achieve at least 40% of the maximum efficiency possible with wavelength-agile transmitters and receivers. To transmit a packet from one user to an other, however, may require routing the packet through intermediate users, each repeating the packet on a new wavelength, until the packet is finally transmitted on a wavelength that the destination user receives. For such a multihop lightwave network, the transmit and receive wavelengths must be assigned to users to provide both a path between all users and the efficient utilization of all wavelength channels. ShuffleNet achieves high efficiency for uniform traffic loads by bringing together generalizations of shuffle interconnection topologies to the problem of wavelength assignment in multihop lightwave networks.

The advent of realtime multimedia services over the Internet has stimulated new technologies for expanding the information carrying capacity of optical network backbones. Multilayer wavelength division multiplexing (WDM) packet switching... more

The advent of realtime multimedia services over the Internet has stimulated new technologies for expanding the information carrying capacity of optical network backbones. Multilayer wavelength division multiplexing (WDM) packet switching is an emerging technology for increasing the bandwidth of optical networks. Two algorithms for the routing of the multimedia traffic flows were applied: (i) Capacitated Shortest Path First (CSPF) routing, which minimizes the distance of each flow linking the given source and destination nodes and satisfying capacity constraints; and (ii) Flow Deviation Algorithm (FDA) routing, which minimizes the networkwide average packet delay.

This paper investigates transparent wavelength routed optical networks using three different fiber types NZDSF, SMF and PSCF - and validates the effectiveness of Hybrid Raman/EDFA Fiber Amplification (HFA) with different pumping levels,... more

This paper investigates transparent wavelength routed optical networks using three different fiber types NZDSF, SMF and PSCF - and validates the effectiveness of Hybrid Raman/EDFA Fiber Amplification (HFA) with different pumping levels, up to the moderate 60% pumping regime. Nodes operate on the basis of flexible-grid elastic NyWDM transponders able to adapt the modulation format to the quality-of-transmission of the available lightpath, exploiting up to five 12.5 GHz spectral slots. Results consider a 37- node Pan-European network for variable Raman pumping level, span length and average traffic per node. We show that HFA in moderate pumping regime reduces the power consumption and enhances spectral efficiency for all three fiber types with particular evidence in NZDSF. In essence to that, introduction of HFA is also beneficial to avoid blocking for higher traffic loads.

Continued progress in both civil and military avionics applications is overstressing the capabilities of existing radio-frequency (RF) communication networks based on coaxial cables on board modern aircrafts. Future avionics systems will... more

Continued progress in both civil and military avionics applications is overstressing the capabilities of existing radio-frequency (RF) communication networks based on coaxial cables on board modern aircrafts. Future avionics systems will require high-bandwidth on-board communication links that are lightweight, immune to electromagnetic interference, and highly reliable. Fiber optic communication technology can meet all these challenges in a cost-effective manner. Recently, digital fiber-optic ...

During flight, aircraft avionics transmit and receive RF signals to/from antennas over coaxial cables. As the density and complexity of onboard avionics increases, the electromagnetic interference (EMI) environment degrades... more

During flight, aircraft avionics transmit and receive RF signals to/from antennas over coaxial cables. As the density and complexity of onboard avionics increases, the electromagnetic interference (EMI) environment degrades proportionately, leading to decreasing signal-to-noise ratios (SNRs) and potential safety concerns. The coaxial cables are inherently lossy, limiting the RF signal bandwidth while adding considerable weight. To overcome these limitations, we have investigated a fiber optic communications link for ...