Performance evaluation of optical ofdm in direct detected. In a direct detection receiver 3, the received optical intensity is detected without extensive frontend optical processing. In 3, the performances of three singlereceiver ddofdm formats at 42. Forghieri2 1 dipartimento di elettronica, politecnico di torino, corso duca degli abruzzi, 24 10129 torino, italy. Joint compensation of cd and pmd in direct detected ofdm transmission using polarizationtime coding weiren peng 1, kaiming feng 2, and sien chi 1 1department of photonics and institute of electro optical engineering, national chiao tung university, hsinchu. Investigation of pmd in directdetection optical ofdm with. Pmd tolerance of 288 gbits coherent wdm and transmission. Shieh, pmdsupported coherent optical ofdm systems, ieee photon. Pmd tolerant directdetection polarization division multiplexed ofdm systems with mimo processing. International journal of scientific and research publications, volume 4, issue 1, january 2014 keywords. Clipping noise is often the major limitation in dcoofdm. Spectrally efficient polarization multiplexed directdetection ofdm system without frequency gap. Jun 14, 2015 this paper investigates the transmission of an injectionlocked optical orthogonal frequencydivision multiplexing ilo ofdm scheme over an optical fiber.
In this method an optical carrier is transmitted whose relative. Finisar provides system manufacturers with critical breakthroughs in optics technologies, and the production volumes. Aug 06, 2007 theoretical and experimental study on pmd supported transmission using polarization diversity in coherent optical ofdm systems. Optical orthogonal frequency division systems with direct. Kahn stanford university, 366 packard building, 350 serra mall, stanford, ca 943059515, usa. Precoding based peaktoaverage power ratio reduction for. Several key technologies in ddoofdm system have been discussed. Experimental validation of a constantenvelope ofdm system. In the proposed system, an rf tone is inserted at the edge subcarrier of the ofdm signal to assist remote signal extraction after beating with all ofdm subcarriers at the receiver. The first part of the thesis is devoted to directdetection systems, with a spe cific focus on.
Precise analysis of optical ofdm system in direct and. Spectrum of 4 qam co ofdm in order to improve the performance of coherent ofdm system, the receiver structure is made. Ofdm system can be mainly categorized as 1 coherent and. Comparison of direct and heterodyne detection optical. In the ilo ofdm system, an optically injectionlocked semiconductor laser is utilized to directly modulate the ofdm signal on the optical carrier. In this paper, we conduct theoretical and experimental study on the pmd supported transmission with coherent optical orthogonal frequencydivision multiplexing co ofdm. Optical links can be implemented using either direct or heterodyne detection receivers 1si. Performance analysis of direct detection and coherent detection system for optical ofdm using qam. Pdf implementation of optical ofdm based system for optical. Coherent optical ofdm using 64qam to high data rates 1. Directdetection optical ofdm ddoofdm is a promising candidate for shorthaul links such as access networks, data centers and broadband wireless topologies, mainly due to its simplicity at the optical receiver architecture as it can use the same optical components employed in onoffkeying ook systems. The limit of distance varies from single mode to multimode fiber. Ofdm for fiberoptic data transmission at high spectral. Pmd, pmd measurement, pmd tolerance, pmd testbed, polarization synthesizer, insitu pmd 1.
Design and performance analysisof ofdmbased single mode and. Layered acoofdm for intensitymodulated directdetection. This work proposes a novel directdetection polarization division multiplexed ofdm scheme without the need of dynamic polarization control at a polarizationdiverse receiver, and the proposed scheme is robust against polarization mode dispersion. The following performance criteria of optical detectors are of major important for applications in optical communication. Haunstein 2007 pmd tolerant directdetection optical. Frequency interleaving towards spectrally efficient directly. Fiber dispersion effects in injectionlocked optical ofdm systems. Advanced digital signal processing techniques for high. Evaluation of the computational effort for chromatic dispersion compensation in coherent optical pm ofdm and pmqam systems p. This approach applies the signal to the amplitude of the transmitted ssbsignal 10. Optical orthogonal division multiplexing for long haul. Impact of nonlinearities on optical ofdm with direct detection.
With a sufficiently large injection strength and a negative shift of the detuning frequency. Osa investigation of pmd in directdetection optical ofdm. Polarizationmode dispersion pmd can cause frequencyselective fading in directdetection optical orthogonal frequency division multiplexing ddoofdm systems. Then an equalization method based on sorted qr decomposition is proposed to further improve the performance. Intensity modulation and direct detection imdd is a costeffective optical communication strategy which finds wide applications in fiber communication, freespace optical communication, and indoor visible light communication. Although there is a systematic separation of deterministic signal components and noisy distortions, the identification of individual deterministic distortions like cd or pmd is not possible, nor is the identification of different noise sources. In imdd, orthogonal frequency division multiplexing ofdm, originally employed in radio frequency communication, is considered as a strong candidate solution to.
Pdf investigation of pmd in directdetection optical ofdm. Compared with the coherent optical ofdm co ofdm 1, the lowerpriced and lesscomplex direct detection optical ofdm ddo ofdm 2 would be a more suitable candidate for. The application of ofdm in optical fiber communication systems. Direct detection system an overview sciencedirect topics. We first study the conventional equalization method for zpofdm. Enabling high capacity directdetection optical ofdm. A 4 qam coherent optical ofdm system was simulated with 8192 samples at 50 gbps. In a direct detection optical ofdm system, where the carrier is displaced away from the subcarriers, the carrier and subcarriers may suffer different polarization rotations, so the carrier will no longer mix with the subcarriers at the photodiode. Coherent detection can provide a potential improvement up to 20 db in the receiver sensivity unlike direct detection based systems for a given power budget, this would allow to increase the total length of an optical link or spacing between repeatersaplifiers. Precise analysis of optical ofdm system in direct and diffused optical wireless environment mohamed e. We investigate the polarization mode dispersion pmd effect of zero padding ofdm zpofdm in directdetection optical orthogonal frequency division multiplexing ddoofdm systems. Impact of nonlinearities on optical ofdm with direct detection abdulamir ali, jochen leibrich, werner rosenkranz chair for communications, university of kiel, kaiserstrasse 2, 24143 kiel, germany, email. Cd tolerance compared to the previous intensitymodulated singlesideband.
Investigation of pmd in directdetection optical ofdm with zero padding article pdf available in optics express 2118. The direct detection system is structurally simple and easy to implement. Index termsdirect detection, optical fiber communication, optical modulation. Pmd compensation in fiberoptic communication systems with direct detection using. Coherent detection in optical fiber systems ezra ip, alan pak tao lau, daniel j. However, because a single larger ofdm band per wavelength was used, such. Theoretical and experimental investigations of directdetected rf. Pdf investigation of pmd in directdetection optical ofdm with. Non gaussian statistics of coofdm signals after nonlinear optical fibre. Pmd compensation in fiberoptic communication systems with direct detection using ldpccoded ofdm article in optics express 157. A comprehensive theoretical model of direct detection dd optical orthogonal frequency division multiplexing oofdm system is described in general. In conclusion, opm from the state model of mlse equalizers in direct detection systems is elaborate and only allows for limited access to individual channel parameters. Pmd tolerant directdetection polarization division. The possibility of polarization mode dispersion pmd compensation in fiberoptic communication systems with direct detection.
Key technologies for optical ofdm in optical longhaul system. Optical ofdm has recently attracted lots of interest because of its simple equalizer for compensating the linear impairments throughout the link1,2. The efficiency of precoding is investigated on a recently discussed approach for optical ofdm, capable of direct detection based on compatible singlesideband modulation compssb 8,9. The possibility of polarizationmode dispersion pmd compensation in fiberoptic communication systems with direct detection using a simple channel estimation technique and lowdensity paritycheck ldpccoded orthogonal frequency division multiplexing ofdm is demonstrated. Joint compensation of cd and pmd in direct detected ofdm. Conclusion in this paper, we presented an opticalofdm system design model for both single mode and multimode fiber. Implementation of optical ofdm based system for optical networks article pdf available in international journal of electrical and computer engineering vol. Pmd compensation in fiberoptic communication systems with. Pdf performance analysis of direct detection and coherent. Osa pmd tolerant directdetection polarization division. Gb on an amdd, 4qam, 10gbps system and 10km of fiber. Pmd tolerant direct detection polarization division multiplexed ofdm systems with mimo processing chiachien wei,1, chunting lin,2 and chihyun wang2 1 department of photonics, national sun yatsen university, kaohsiung, taiwan.
Evaluation of the computational effort for chromatic. Clipping noise mitigation in optical ofdm systems cuiwei he and jean armstrong abstractthis letter describes a new nonlinear algorithm for clipping noise mitigation in intensity modulationdirect detection dc biased optical orthogonal frequency division multiplexing dcoofdm systems. Home forums system coherent detection ofdm coherent detection ofdm chee joined november 2014 participant i want to simulate an ofdm coherent detection system. Setting the frequency difference between two polarizationorthogonal reference carriers as one subcarrier spacing, possible signal fading can be. Xie, pmd insensitive directdetection optical ofdm systems using selfpolarization diversity, in optical fiber communication conference and exposition and the national fiber optic engineers conference. As long as there is no pmd or pdl the two orthogonally polarized. Introduction the main objective of determining the pmd tolerance of an optical transmission system is to. Coherent optical orthogonal frequency division multiplexing coofdm is highly tolerant against. Abstract the impact of kerr effect and modulator nonlinearity on optical ofdm transmission is studied for an. Theoretical and experimental study on pmdsupported. White2 1tsinghua national laboratory for information science and technology tnlist,department of electronic engineering, tsinghua university, beijing 84, china. The impact of dc bias and the rf drive voltage of the dual electrode mach zehnder modulator demzm on the transmission performance of optical orthogonal frequency division multiplexing o ofdm direct detected systems is analyzed theoretically and verified by simulation. Nongaussian statistics of coofdm signals after nonlinear optical fibre. Ofdm systems for optical communication with intensity.
Performance analysis of direct detection and coherent. Direct detected optical ofdm ddo ofdm has been demonstrated to have 21ps differential group delay dgd tolerance for a 10gbits total line rate with numerical simulations 11, which could be enhanced by polarization diversity with combined cd and pmd compensation at the receiver 12. Schmidt, arthur james lowery, and jean armstrong, impact of pmd in singlereceiver and polarizationdiverse directdetection optical ofdm, j. Layered acoofdm for intensitymodulated directdetection optical wireless transmission qi wang,1 chen qian,1 xuhan guo,2 zhaocheng wang,1. Chiachien wei,1, chunting lin,2 and chihyun wang2 1 department of photonics, national sun yatsen university, kaohsiung, taiwan.
Hence, direct detection systems can utilize onoff keying used. Joint compensation of cd and pmd in directdetected ofdm. Osa pmd tolerant directdetection polarization division multiplexed. Xie, pmd insensitive directdetection optical ofdm systems using selfpolarization diversity, in optical fiber communication conference and exposition and the national fiber optic engineers conference, osa technical digest cd optical society of america, 2008, paper omm2. Sep 09, 20 investigation of pmd in directdetection optical ofdm with zero padding. Pmd tolerant directdetection polarization division multiplexed ofdm systems with mimo processing article in optics express 207. Investigation of receiver concepts for coherent optical orthogonal. Theoretical and experimental study on pmd supported. Numerical simulation results show that compared with cyclic prefix ofdm cpofdm, zpofdm has a significantly higher tolerance to pmd in ddoofdm systems when the channel spectral nulls occur at certain differential group delay dgd values. Direct detection of exoplanets direct detection producing an actual image of the object, not indirect detection through its influence on its parent star. Finisar is a global technology leader in optical communication subsystems and components that enable highspeed voice, video and data communications for networking, storage, wireless, and cable tv applications. This could cause a majority of the subcarriers to fade in power. Tamazin college of engineering and technology, arab academy for science, technology and maritime transport, alexandria, egypt. Digital optical systems based on coherent and direct detection.
555 1065 1578 243 1428 780 882 1227 1516 978 1040 1329 1600 809 478 483 1420 899 537 116 517 283 1328 730 332 1421 1372 100 1278 1274 957 1265