Analytical Investigation of 8-Channel Optical Wavelength Division Multiplexing Communication System

Similar documents
Implementing of High Capacity Tbps DWDM System Optical Network

Design of Ultra High Capacity DWDM System with Different Modulation Formats

Analysis of four channel CWDM Transceiver Modules based on Extinction Ratio and with the use of EDFA

Improved Analysis of Hybrid Optical Amplifier in CWDM System

Performance Comparison of Pre-, Post-, and Symmetrical Dispersion Compensation for 96 x 40 Gb/s DWDM System using DCF

Comparative Analysis Of Different Dispersion Compensation Techniques On 40 Gbps Dwdm System

ANALYSIS OF DWDM SYSTEM USING DIFFERENT MODULATION AND COMPENSATION TECHNIQUE AT DIFFERENT BIT RATES

Chirped Bragg Grating Dispersion Compensation in Dense Wavelength Division Multiplexing Optical Long-Haul Networks

Analyzing the Non-Linear Effects in DWDM Optical Network Using MDRZ Modulation Format

1.6 Tbps High Speed Long Reach DWDM System by incorporating Modified Duobinary Modulation Scheme

Performance Limitations of WDM Optical Transmission System Due to Cross-Phase Modulation in Presence of Chromatic Dispersion

Available online at ScienceDirect. Procedia Computer Science 93 (2016 )

Performance Evaluation of 32 Channel DWDM System Using Dispersion Compensation Unit at Different Bit Rates

EDFA-WDM Optical Network Analysis

Kuldeep Kaur #1, Gurpreet Bharti *2

Design of an Optical Submarine Network With Longer Range And Higher Bandwidth

Analysis of Gain and NF using Raman and hybrid RFA-EDFA

Performance of A Multicast DWDM Network Applied to the Yemen Universities Network using Quality Check Algorithm

Performance Analysis of Designing a Hybrid Optical Amplifier (HOA) for 32 DWDM Channels in L-band by using EDFA and Raman Amplifier

32-Channel DWDM System Design and Simulation by Using EDFA with DCF and Raman Amplifiers

Optical Transport Tutorial

EDFA Applications in Test & Measurement

Suppression of Four Wave Mixing Based on the Pairing Combinations of Differently Linear-Polarized Optical Signals in WDM System

Photonics and Optical Communication Spring 2005

11.1 Gbit/s Pluggable Small Form Factor DWDM Optical Transceiver Module

Spectrum Sliced WDM-PON System as Energy Efficient Solution for Optical Access Systems

FWM Suppression in WDM Systems Using Advanced Modulation Formats

Performance Analysis of dispersion compensation using Fiber Bragg Grating (FBG) in Optical Communication

Eye-Diagram-Based Evaluation of RZ and NRZ Modulation Methods in a 10-Gb/s Single-Channel and a 160-Gb/s WDM Optical Networks

Enhancing Optical Network Capacity using DWDM System and Dispersion Compansating Technique

Improvisation of Gain and Bit-Error Rate for an EDFA-WDM System using Different Filters

Dispersion Pre-Compensation for a Multi-wavelength Erbium Doped Fiber Laser Using Cascaded Fiber Bragg Gratings

PERFORMANCE ANALYSIS OF WDM AND EDFA IN C-BAND FOR OPTICAL COMMUNICATION SYSTEM

Gain Flattening Improvements With Two Cascade Erbium Doped Fiber Amplifier In WDM Systems

Implementation and analysis of 2 Tbps MDRZ DWDM system at ultra narrow channel spacing

Visible to infrared high-speed WDM transmission over PCF

Comparative Analysis of Various Optimization Methodologies for WDM System using OptiSystem

Investigation of Performance Analysis of EDFA Amplifier. Using Different Pump Wavelengths and Powers

Long-Haul DWDM RF Fiber Optic Link System

Compensation of Dispersion in 10 Gbps WDM System by Using Fiber Bragg Grating

Wavelength Interleaving Based Dispersion Tolerant RoF System with Double Sideband Carrier Suppression

RZ BASED DISPERSION COMPENSATION TECHNIQUE IN DWDM SYSTEM FOR BROADBAND SPECTRUM

Polarization Mode Dispersion compensation in WDM system using dispersion compensating fibre

EDFA-WDM Optical Network Design System

Gain Flattened L-Band EDFA -Raman Hybrid Amplifier by Bidirectional Pumping technique

Measuring Photonic, Optoelectronic and Electro optic S parameters using an advanced photonic module

Simulation of RoF Using Wavelength Selective OADM

PERFORMANCE ANALYSIS OF WDM PONS BASED ON FP-LD USING RZ-OOK AND NRZ-OOK

Performance Analysis of Gb/s DWDM Metropolitan Area Network using SMF-28 and MetroCor Optical Fibres

Thursday, April 17, 2008, 6:28:40

Performance Analysis of Direct Detection-Based Modulation Formats for WDM Long-Haul Transmission Systems Abstract 1.0 Introduction

ANALYSIS OF FWM POWER AND EFFICIENCY IN DWDM SYSTEMS BASED ON CHROMATIC DISPERSION AND CHANNEL SPACING

Performance Analysis of Dispersion Compensation using FBG and DCF in WDM Systems

Performance Investigation of RAMAN-EDFA HOA for DWDM System (Received 17 September, 2016 Accepted 02 October, 2016)

Performance Analysis of 4-Channel WDM System with and without EDFA

Ph.D. Course Spring Wireless Communications. Wirebound Communications

Performance Analysis of WDM-FSO Link under Turbulence Channel

Analysis of Self Phase Modulation Fiber nonlinearity in Optical Transmission System with Dispersion

Module 19 : WDM Components

Performance Analysis Of An Ultra High Capacity 1 Tbps DWDM-RoF System For Very Narrow Channel Spacing

Analysis of Transmitting 40Gb/s CWDM Based on Extinction Value and Fiber Length Using EDFA

Optical Fibre Amplifiers Continued

CWDM Cisco CWDM wavelengths (nm)

PERFORMANCE ASSESSMENT OF TWO-CHANNEL DISPERSION SUPPORTED TRANSMISSION SYSTEMS USING SINGLE AND DOUBLE-CAVITY FABRY-PEROT FILTERS AS DEMULTIPLEXERS

S-band gain-clamped grating-based erbiumdoped fiber amplifier by forward optical feedback technique

Performance Analysis of 48 Channels DWDM System using EDFA for Long Distance Communication

A Novel Design Technique for 32-Channel DWDM system with Hybrid Amplifier and DCF

OPTICAL TRANSPORT CAPACITIES have been growing

DISPERSION COMPENSATION IN OFC USING FBG

Physics 464/564. Research Project: AWG Technology in DWDM System. By: Andre Y. Ma Date:

Performance Analysis Of Hybrid Optical OFDM System With High Order Dispersion Compensation

Investigation on Multi-Beam Hybrid WDM for Free Space Optical Communication System

Design And Analysis Of Ultra High Capacity DWDM System With And Without Square Root Module For Different Modulation Formats

8 10 Gbps optical system with DCF and EDFA for different channel spacing

Performance Evaluation of Gbps (1.28 Tbps) FSO Link using RZ and NRZ Line Codes

MULTICHANNEL COST EFFECTIVE FULL DUPLEX RADIO OVER FIBER COMMUNICATION SYSTEM USING FIBER BRAGG GRATING FILTER

PERFORMANCE EVALUATION OF GB/S BIDIRECTIONAL DWDM PASSIVE OPTICAL NETWORK BASED ON CYCLIC AWG

Determination of ideal Fibre Bragg Grating (FBG) length for Optical Transmission System

TRANSMISSION OF NG-PON FOR LONG HAUL NETWORKS USING HYBRID AMPLIFIER

Simulation of Pre & Post Compensation Techniques for 16 Channels DWDM Optical Network using CSRZ & DRZ Formats

Performance analysis of terrestrial WDM-FSO Link under Different Weather Channel

BER Evaluation of FSO Link with Hybrid Amplifier for Different Duty Cycles of RZ Pulse in Different Conditions of Rainfall

International Journal of Advanced Research in Computer Science and Software Engineering

EDFA SIMULINK MODEL FOR ANALYZING GAIN SPECTRUM AND ASE. Stephen Z. Pinter

Design and Performance Analysis of Optical Transmission System

Downstream Transmission in a WDM-PON System Using a Multiwavelength SOA-Based Fiber Ring Laser Source

International Journal of Computational Intelligence and Informatics, Vol. 2: No. 4, January - March Bandwidth of 13GHz

International Journal of Advanced Research in Computer Science and Software Engineering

Power penalty caused by Stimulated Raman Scattering in WDM Systems

Performance Analysis of Dwdm System With Different Modulation Techique And Photodiode

Application of optical system simulation software in a fiber optic telecommunications program

Simulative Analysis of 40 Gbps DWDM System Using Combination of Hybrid Modulators and Optical Filters for Suppression of Four-Wave Mixing

Dynamic gain-tilt compensation using electronic variable optical attenuators and a thin film filter spectral tilt monitor

Performance Evaluation of Different Hybrid Optical Amplifiers for 64 10, and Gbps DWDM transmission system

Optical Amplifiers Photonics and Integrated Optics (ELEC-E3240) Zhipei Sun Photonics Group Department of Micro- and Nanosciences Aalto University

Gain Characteristics for C-Band Erbium Doped Fiber Amplifier Utilizing Single and Double-Pass Configurations: A Comparative Study

Phase Modulator for Higher Order Dispersion Compensation in Optical OFDM System

Physical Layer. Dr. Sanjay P. Ahuja, Ph.D. Fidelity National Financial Distinguished Professor of CIS. School of Computing, UNF

FIBER OPTICS. Prof. R.K. Shevgaonkar. Department of Electrical Engineering. Indian Institute of Technology, Bombay. Lecture: 26

ECEN689: Special Topics in Optical Interconnects Circuits and Systems Spring 2016

Transcription:

Wavelength Division Multiplexing Dr. Mohammed Hussian Ali * Received on:4/3/2009 Accepted on:2/7/2009 Abstract In this paper, the theoretical 8-channel Dense Wave Division Multiplexing (DWDM) telecommunication system is demonstrated. Laser Diode (LD) source was used for each channel, with external modulator, therefore making the system work at high bit rate. The analytical part was done using a software simulator. All the proposed system components were simulated using Optisystem software offered by Optiwave for testing a DWDM communication system. The 8-channel DWDM spectrum, attenuation, dispersion, and receiver performance was determined. Keywords: Optical Fiber Communication, Wave Division Multiplexing, Modulation, Optical Amplifier. الفحص التحليلي لنظام اتصالات متعدد دمج الا طوال الموجية الكثيف ذو ثمان قنوات الخلاصة في هذا البحث, و ص ف المبدا النظري للمنظومة اتصالات من نوع متعدد دمج تقسيمات الا طوال الموجية الكثيف (DWDM). ا ستعمل في العمل مصدر دايود ليزري لكل قناة مع مضمن خارجي وهذا يجعل المنظومة تعمل بمعدل بتات عالي. ا ما جزء التحليل قد تحقق بواسطة استخدام برنامج محاكاة خاص. كل ا جزاء نظام الاتصالات المقترح, قد حللت وفحصت بواسطة برنامج محاكاة."Optisystem" حدد شكل الطيف و الخساي ر والتشتت وا داء المستقبل الخاص بنظام متعدد دمج تقسيمات الا طوال الموجية الكثيف لثمان- قنوات( DWDM.(8-channel 1. Introduction A powerful aspect of an optical communication link is that many different wavelengths can be sent along a single fiber simultaneously in to 1300-to-1600-nm spectral band. The technology of combining a number of wavelengths onto the same fiber is known as wavelengthdivision multiplexing. Conceptually, the WDM scheme is the same as frequency division multiplexing used in microwave radio and satellite system [1, 2]. The Dense Wave division multiplexing(dwdm) technology is widely used in today's telecommunication networks. However, the economical factor makes DWDM systems available only for application in long-haul systems with demand for high capacity [3]. Using such a system telecom operators would be able to multiplex various technologies /services via one fiber. The simulation done by an advanced optical communication system simulation package designed for professional engineering called OptiSystem simulating software by *Laser and Optoelectronic Engineering Department, University of Technology/Baghdad 552

optiwave. OptiSystem represents an optical communication system as an interconnected set of blocks. Each block is simulated independently using the parameters specified by the user for that block and the signal information passed into it from other blocks [4]. This paper discuses the DWDM telecommunication system. Section 2 gives overview n-channel DWDM communication system. Section 3 deals with simulation system and some results of the 8-channel DWDM system simulation. The summary of paper and present conclusions discuss in section 4. 2. DWDM System Design Fig.(1) shows a schematic diagram of the n-channel DWDM system. The transmission side of DWDM system involves n-ld with internal modulation operating in the 1550nm region. This region was chosen to minimize influence of fiber loss and to have a potential opportunity to use EDFAs (Erbium Doped Fiber Amplifiers) for spans longer than 10 km. The wavelengths may be combined in many ways; for example, a diffraction grating or prism may be used. Both of these components act as dispersive optical elements for the wavelengths of interest; they can separate or re-combine different wavelengths of light. The grating or prism can be quite small, and may be suitable for integration within a WDM transceiver package [5]. To find the optical bandwidth corresponding to a particular spectral width in this region, the relationship c = λν can be used, which relates the wavelength (λ) to the carrier frequency (ν). The change in frequency ( ν) becomes: c n = l D 2 Dl The optical bandwidth is ν=14thz for a usable spectral band from about 1370 1350 nm (the 1310nm window). Similarly, ν=15thz for a usable spectral band from about 1480-1600 (the 1550nm window). This yields a total available fiber bandwidth of about 30THz in two low-loss windows. The optical amplifiers like Erbium Doped Fiber Amplifiers (EDFA) work without having to convert optical signal into electrical from and back. This features leads to two great advantages. First, optical amplifiers support any bit rate and signal format because again they simply amplify the received signal. Thus optical amplifiers are transparent to any bit rate and signal format. Secondly, they support not just a single wavelength, as repeaters do, but the entire range of wavelengths. Due to the extremely desirable characteristics of the EDFA, most systems would use EDFAs. EDFA amplify only near 1.55μm, and therefore not use the dispersion-zero 1.3-μm band of the existing embedded conventional fiber base [6]. 3. WDM System Simulation The proposed 8-optical channel WDM system is shown in Fig.(2). On the transmission side of the system, the 8-laser diode operating in the 1550 nm region are plotted in one block. Each channel modulated with modulation rate to achieve data transfer rate of 10 Gbit/s. The type of modulation used was on-off keying (OOK) and NRZ (Non-Return to Zero) format was used for signal 3

coding. The spectrum of modulated LD signal is shown in Fig.(3). For multiplexing eight channels into a single fiber, the optical multiplexer with 20GHz channel bandwidth and 100GHz channel frequency spacing is used to reduce the crosstalk between adjacent channels. The system was designed so that to minimize noise from the adjacent channels. The spectrum of the 8-channel multiplexed signal at output of multiplexer is shown in Fig.(4). Optical amplifiers EDFA work to amplifying the optical pulses signal. The gain is not uniform with wavelength, whereas the interamplifier losses are nearly wavelength independent. For a single amplifier, as shown in Fig.(2), the gain exhibits a peak at 1530 nm and a relatively flat region near 1555 nm[5]. The EDFA gain is 20dB and its Noise Figure (NF) is 4dB. The multiplexed signal spectrum after EDFA is shown in Fig.(5). It can be see from Fig.(5), the maximum signal becomes 0dBm for all channels while the input to the EDFA is equal - 10dBm. The multiplexed signal is tested by transmitting the signal over 20km, 50km and 80km of standard single mode fiber. The spectrum of multiplexed signal at end of fiber is shown in Fig.(6). Single mode fiber was chosen to minimize the influence of dispersion and the main limitation of the system as it is seen from the simulation. The demultiplexer has the same parameters as the multiplexer in terms of channel bandwidth and channel spacing. On the receiver side of the system, the eight avalanche photodiodes (APDs) to detect signals and eight Bit Error Rate (BER) meters and eyediagram analyzers to evaluate performance of each channel. Avalanche photodiodes were chosen because they have higher sensitivity than PIN photodiodes which is essential, because of high slicing losses. The effect of attenuation only on the system is investigated by relationship between the BER and optical fiber length. This relation shown Fig.(7). Fig.(8) shows the influence of dispersion on BER for 10Gbit/s link. The major influence of dispersion on 10Gbit/s signal is limiting the fiber span from 67km to 37km in order to achieve BER< 10-9. The eye diagram of received signal is demonstrated in Fig.(9) for fiber length 20km, 50km, and 80km respectively. Fig.(9) show that the amplitude of received signal at fiber length of 20km is approximately ten times the amplitude at fiber length of 50km. It can see that the eye diagram of the received signal at 80km span is worse as shown in Fig.(9), the main reason for this being the influence of attenuation and dispersion. 4. Conclusion This paper, reported and depicted the results of an investigation into the use of 8-channel Dense Wave Division Multiplexing (DWDM) telecommunication system in high bit rate optical transmission systems. The analytical investigation was employing standard optical fibers without and with dispersion. The dependence of the optical path loss, horizontal eye pattern opening on the fiber length and input impulse shape is found along the fiber by using computer simulation. In case of neglected the dispersion, the DWDM system has better parameters for 4

transmission distances less than 67km. While testing the system with dispersion, make the distances become smaller and less than 37km. References [1]G. Keiser, Optical Fiber Communications, McGraw-Hill, 2nd edition, 1991. [2]D. Ngo and H. Nguyen "The Application of Fiber Optic Wavelength Division Multiplexing in RF Avionics", 23rd Digital Avionics Systems Conference, Salt Lake City, Utah, October 24 28, 2004. [3]G. Agrawal, "Fiber-Optic Communications Systems", Third edition, Academic Press, 2002. [4]Optiwave OptiSystem "Optiperformer version 7.0 User Guide", Optical Communication System Design Software, 2008. [5]C. Decusatis, "Fiber Optic Data Communication", Academic Press, 2002. [6]M. Bass and E. W. Van Stryland, "Fiber Optics Handbook", McGraw-Hill, 2002. 5

Data LD l 1 Optical fiber l 1 APD BER Data Data LD LD l 2 l n Wavelength Multiplexer EDF Amp. Wavelength Demultiplexer l 2 l n APD APD BER BER Figure (1) Schematic diagram of the n-channel WDM system. Figure (2) The proposed 8-optical channel WDM system 6

Wavelength (m) Power (dbm) Power (dbm) Figure (3) The spectrum of modulated LD signal Wavelength (m) Figure (4) Spectrum of the 8-channel multiplexed signal at output of multiplexer 7

Wavelength (m) Power (dbm) Figure (5) Spectrum of Output multiplexed signal of EDFA 8

Fiber length = 20km Fiber length = 50km Fiber length = 80km Figure (6) The spectrum of multiplexed signal at end of fiber 9

10-3 10-5 BER 10-7 10-9 10-11 10-13 50 55 60 65 70 75 80 Optical fiber length (km) Figure (7) The influence of attenuation on BER 10-3 10-5 BER 10-7 10-9 10-11 10-13 10-15 30 35 40 45 50 Optical fiber length (km) Figure (8) The influence of dispersion on BER 0

Fiber length = 20km Fiber length = 50km Fiber length = 80km Figure (9) Eye diagram of received signal at various fiber length 1