Patterson, member, ieee abstract numerical analysis of the dispersioncompensating properties of. Dispersioncompensating fiber an overview sciencedirect topics. Pdf design and performance evaluation of a dispersion. Long fibre gratings have received increased attention from a dispersion compensation point of view, due to the increased bandwidth over which the chromatic dispersion compensation can be performed. In order to achieve wideband dispersion compensation with a low. This memorandum of understanding expressly prohibits the city, kfn, or any third party from having access to any shared portion of the fiber optic network, including handholes, manholes, conduit, fiber optic cables, or fiber. Electronic dispersion compensation of 40gbs multimode fiber links using iir equalization g. Electronic dispersion compensation of 40gbs multimode. Fiber bragg gratings for dispersion compensation in.
Production results are presented for three types of dcf. A wide variety of dispersion compensated fiber options are available to you, there are 187 suppliers who sells dispersion compensated fiber on, mainly located in asia. Negative dispersion, macrobending loss, dispersion. Wavelength division multiplexing wdm technology used in dispersion fiber communications which combine a number of optical carrier signals into a single. This lesson demonstrates the possibility for dispersion compensation with the help of fiber bragg grating created with the fiber grating component. A great variety of versatile grating techniques have been developed over the past years, such that grating designs to meet nearly any application now can be manufactured. Both can provide complete dispersion compensation and remove entirely the memory effect associated to dispersion in the absence of fiber nonlinearity. In a wdm system the optical intensity or power fluctuations of a optical wave propagating in an optical fiber modulates he phase of the other copropagating optical signals through a phenomenon called cross phase modulation xpm. Dispersion managed fiber dmf designs were introduced where the dispersion slope was also compensated. Design of dispersion compensating fibers with high negative dispersion and low bending loss. The techniques consist of different chirp functions applied to a tanh fiber bragg grating fbg, a dispersion compensation fiber dcf, and a dcf merged with an. Here, the dispersion was managed within the span, by allocating two types of fiber. Our products are the only ones that combine all the benefits of the fbg and dcf technology. Theoretical model and design criteria for nearly ideal pulse recompression natalia m.
However, this is not cost effective as, first, ds fiber exhibits higher loss, second, it is more expensive and, third, because the embedded fiber plant throughout the world largely contains standard singlemode fiber. Rovisco pais 1, 1049001 lisbon, portugal abstract this work aims to understand the time dispersion in optical communication systems and. Polarization maintaining dispersion compensating fiber. The design features of a tricladding index profile were described, and the properties of the obtained fibers were measured. Dispersion compensation modules offset both the fiber dispersion as well as. Pdf by optimizing the fabrication process of the chirped optical fiber bragg grating cfbg, some key problems of cfbg are solved, such as fabrication. Properties of actual dcfs for discrete compensation including loss and nonlinear effects are discussed. Users want more bandwidth and dispersion limits bandwidth in optical fibers. A nonzero dispersion shifted fiber optimized for use in highdatarate wavelength division multiplexed wdm systems, metrocor fiber operates in the erbiumdoped fiber amplifier edfa window. The innovation of wavelength division multiplexing wdm enables multiple signals to be transmitted on the same fiber. Thorlabs dispersion compensating bare fiber delivers high performance across a broad spectral range in the telecom region.
The dc fiber is fabricated from silica glass and has a refractive index profile that includes a core region 51 surrounded by a cladding region 52 having a nominal refractive index n 4. Seraji, jamshid ahvati optical communication group, irantelecom research, tehran, iran. Dispersion compensation schemes a system perspective. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. A novel method for combating dispersion induced power fading in dispersion compensating fiber alexander lebedev, j. All fiber gratings are tested to assure they conform to the highest quality standards. The power reflectivity spectrum and dispersion characteristics of the chirped fiber bragg gratings are analysed. Dispersion compensating fibers dcf with improved splicing performance were designed and fabricated.
Singlemode dispersion compensating fiber designs with absolute dispersion values of greater than 100 psnm km are described. Broadening is a function of distance as well as dispersion parameter d. Characterization of fiber bragg grating for dispersion. A multiclad fiber with a triangular refractiveindex profile in the core gives a dispersion of. Vakili zhongren yue the university of tennessee space institute. A wideband chirped fiber bragg grating fbg dispersion compensator operating in c band is designed theoretically by numerically solving the coupled mode equations. Dispersion compensating fibers with improved splicing. The dispersion of optical pulses propagating in high speed wdm optical transmission systems is almost unavoidable. Our analysis is carried out by solving the wave equation under the linearly polarized approximation, which leads to transcendental equations that. This paper gives an overview of idfrdf fiber design and development for submarine system. The main design features of a triplecladding index profile design are examined theoretically and experimentally. The quality of the dispersion compensation expressed as residual dispersion after compensation is treated. San jose state university sjsu scholarworks masters theses masters theses and graduate research 2002 dispersion compensation in fiber optic communication systems.
Dcf3 fiber is a nonzero dispersionshifted fiber nzdsf with negative dispersion and low positive dispersion slope that is optimal for medium distances and wide band wdm systems. Stretched fiber based dispersion compensating module for. Dispersioncompensating fiber having a high relative. Dispersion compensation using highpositive dispersive. Starting with the basic principle behind dcf, its need for upgrading the 10 nm optical.
Low cost carbon fiber technology development for carbon fiber composite applications april 2012 fta report no. The physical idea behind this compensation is following. Productsservices for dispersion compensating fiber. Pdf dispersion compensation of fiber bragg gratings in 3100 km.
The amount of light dispersed by a normal fiber in reduced or even nullified by using a dispersion compensating fiber having a very large value of dispersion of opposite sign as. The use of dispersionshifted ds fiber with zero dispersion wavelength near 1550 nm is one obvious solution. Coupling light into a fiber is trivial compared to aligning a grating stretcher. They are used as sensors, as wavelength stabilizers for pump lasers, in narrowband wdm adddrop. A novel technique for wideband dispersion compensation using multiply cladded fiber is presented here. Rp photonics encyclopedia dispersion compensation, pulse. Measurement of phase and group birefringence is discussed. Patterson, member, ieee abstract we propose a transmissionbased dispersion compensator employing an apodized, unchirped.
Slope compensating and dispersion compensating fibers scdcf for a dispersion shifted fiber dsf have been designed and fabricated. Recent advances in long dispersion compensating fibre. This work reports on the performance of a dispersion compensating coaxial fiber as a function of its geometric parameters. Thorlabs offers dispersion compensating bare fiber for custom solutions across a broad spectral range in the telecom region. Fiberbased dispersion compensation is an attractive technology for upgrading wdm communication. Both dcf and idf were used as dispersion compensating fiber for positive dis. Dispersion compensating fibers and fiber bragg grattings. Dscf dispersion slope compensating fiber acronymattic. Wdm techniques enhance the capacity and provide bidirectional communication.
For the first time fabrication results are presented for a polarization maintaining dispersion compensating fiber. With the development of wavelength division multiplexing wdm techniques for large capacity optical communication systems, dispersion compensation technologies have been applied into the field. Dispersion compensation in optical fiber communication. Electronic dispersion compensation of 40gbs multimode fiber links using iir equalization 7 system simulation iir equalization of a 50 m mmf link at 40 gbs comparing the performance of a 3tap fir versus a 3tap ff and 2tap fb iir equalizer both equalizers have t s2 tap spacing mmf fiber channel awgn transmit filter receive filter. Different dispersion compensation techniques in fiber. Design of dispersion flattened and compensating fibers for dispersion managed optical communications systems.
Dispersion flattened fibres and wideband fibres 23 some compensating fibres could work at short spectrum of. It starts with the concept of dispersion management line and its difference from the conventional dcf used in a module. Dispersion compensation was originally proposed to equalize pulse distortion. Dispersion compensation is an important issue for fiberoptic links, i. This component allows design of apodized and chirped fiber gratings that are able to provide dispersion compensation in optical system. Disclosed is a dispersioncompensating dc optical fiber 10 that is designed to support the fundamental mode of radiation at 1550 nm. Low cost carbon fiber technology development for carbon. Dwdm devices combine the output of more than eight optical transmitters for transmission across a single optical fiber. Fiber bragg gratings fbg have been a subject of research with several applications. Compensation of dispersion with fiber bragg grating component. One solution would be to combine active modelocking and one of the passive mode locking techniques. Corning metrocor optical fiber advanced broadband supply. The overall dispersion of these fibers is opposite in sign and much larger in magnitude than that of standard fiber, so they can be used to cancel out or. In chromatic dispersion 1,it gives an opportunity to compensate for dispersion along the entire span of the fiber optic link.
Nonlinear impairments dispersion compensation fiber. Symmetrical dispersion compensation for high speed. The scdcf has realized a targeted dispersion slope compensation ratio, which require the highest relative dispersion slope rds among various types of scdcfs. Compensation of nonlinear phase shifts with third order. A novel method for combating dispersion induced power. Technological training fiber characterization for dwdm. Here, strong dispersive broadening of modulated signals can occur in. The first type spliced to the repeater output is a large effective area fiber with positive dispersion. Single mode dispersion compensating fiber aitc group. Problems like dispersion, cross talk and other nonlinear effects occur in optical networks. Dispersion compensation can be applied in the optical domain using dispersion compensating fibers for instance or in the electronic domain using digital signal processing after coherent detection. Dispersion compensating fiber dcf in dispersion compensating fiber technique we use a fiber having a large negative dispersion along with a standard fiber. Standard single mode fiber or nonzero dispersion shifted fiber has been widely used in long haul systems. Dense wavelength division multiplexing dwdm is an extension of optical networking.
Yofc dispersion compensating fibre is specially developed through proprietary pcvdbased technology. Design considerations on a dispersion compensating coaxial. Fiber design with special emphasis on design tradeoffs is considered. The figure below is the reflection spectrum of our dispersion compensation grating filtre. The top countries of suppliers are india, china, from which the percentage of dispersion compensated fiber supply is. Apart from the difficulty of compensating the cubic phase, a fiber offers major advantages as the pulse stretcher in a cpa system. Dscf stands for dispersion slope compensating fiber. Fiber bragg gratings for dispersion compensation in transmission. Dscf is defined as dispersion slope compensating fiber rarely.
Fiber brag grating is used for blocking certain wavelength and passed. Dispersion compensation in fiber optic communication systems. Our unique fiber grating apodization technology enables us to fabricate dispersion compensation grating filters with high isolation, low side lobes and low ripples. Analysis of fiber bragg gratings for dispersion compensation in re.
These fibers have both high mechanical reliability and high optical stability. Dispersion compensating fiber used as a transmission fiber. Dispersion compensation optical fiber modules for 40 gbps. Taking advantages of pcvd process, yofc is able to manufacture complex indexprofile shapes accuratelly, therefore,to get the optimized products. Pdf design of dispersion flattened and compensating. This dispersion compensation fiber dcf is designed to compensate the accumulated dispersion in long haul optical fiber transmission systems in the c band. Dispersion compensating fibers dcfs are quite attractive fiberbased components for upgrading the existing smfs. The dispersion compensating fiber simulations demonstrated that is possible to fully recover the initial shape of the pulse when group velocity dispersion and higherorder dispersion are considered separately. The positive dispersion transmission fiber typically comprises a single mode fiber designed to introduce dispersion in order to reduce the nonlinear interactions between channels. Dispersion compensating fiber modules for dispersion. Fibers and filaments 190 companies materials fibers and filaments consist of bulk, chopped fibers or strands and continuous monofilaments of materials and are used in reinforcing composites as well as other specialized electrical and thermal applications. Since dispersion is inevitable in optical fibers, dispersion compensating fibers, such as those sold on this page, can be incorporated into optical systems. The dispersion compensation enables the coherent addition of the. The compensating fiber is designed to operate in lpsub 11 mode near its cutoff.
825 1028 680 761 1158 95 1019 142 298 1285 995 757 140 258 551 1173 301 1069 1404 129 1348 533 610 1184 229 1077 1031 1479 1442 990 222 196 475 633 852 140 1141 1300 1377 1239 1453 912 1495 488