Dcf modules inserted into transmission line at regular interval. Dcm dispersion compensation modules provides fixed chromatic dispersion compensation for highspeed metro core, regional, and extendedhaul dwdm networks. The simulated baseline dispersion map for ssmf and dcf is, respectively, 1600 and. 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.
The 359c series dispersion compensation module provides a solution for dealing with existing high dispersion legacy installations. Typical dispersion compensation modules can increase the total fiber length by as much as 65%, while these highly efficient high dispersion fibers only increase. Temperature effects in optical fiber dispersion compensation modules by mikhail shenouda a thesis presented to the university of waterloo in fulfillment of the thesis requirement for the degree of master of science in physics waterloo, ontario, canada, 20 mikhail shenouda 20. The rp photonics buyers guide contains 21 suppliers for dispersion compensation modules. For example, to compensate the cd of 50 km of smf28. Dispersion compensation modules dcm series the arris dcm series is a product family of dispersion compensation modules that increase the transmission distances of 1550 nm analog and digital signals. Differential group delay measurements of a fiberbased dispersion compensation module under different controlled temperature variations experience long birefringence relaxation times 10 h in. Dispersion compensation module free download as powerpoint presentation. Fiberbased dispersion compensation is an attractive technology for upgrading wdm communication systems because of its. Dispersion compensation module dcm vialite communications. Fiberdyne dispersion slope compensation module dcm can compensate the dispersion with optimized residual dispersion for standard singlemode fiber g. In analog systems, this dispersion manifests itself as second order distortion in the signal. We will now show how the amount of compensating dispersion affects system performance.
The ape femtocontrol is a compact motorized dispersion compensation unit for optimization of the. Typically, such a module provides a fixed amount of dispersion e. For extremely long fiber transport distances of greater than 80 km, fiber optic dispersion compensation modules are often required. Arnaud leroy, omar ait sab, in undersea fiber communication systems second edition, 2016. Dcf has become a most useful method of dispersion compensation and has been extensively studied.
Dispersion compensation module dcm rollball international. Modal dispersion, arising from geometrical properties of multimode fiber, are also considerably more severe at 10 gbs than at lower rates. In optical fiber communications, dispersion compensation modules dcm, dcu can be used for compensating the chromatic dispersion of, e. The modules based on mature and reliable optical fiber technology with excellent performance for optical transmission system. Dispersion compensation fibers have a negative and large dispersion and thus can counter act the positive distortion introduced in the fiber due to the various degrading impairments as discussed in the previous chapter.
Temperature effects in optical fiber dispersion compensation. Optical chromatic dispersion compensation module comprising an optical chromatic dispersion compensating fiber wound on a shape which allows a variation of the radius of curvature between two given points of said optical fiberso as to have a variable radius of curvature, the fiber being a dualcore fiber comprising a central core with a. Dispersion in optical networks used for data transport, particularly over longer fiber distances, can adversely affect system. The ape femtocontrol is a compact motorized dispersion compensation unit for. Dispersion slope compensation module dcm based on dispersion slope compensating fiber in module package, special for g. After transmission, the signal is amplified, and the dispersion of the link is compensated using standard dispersion compensation modules with a total insertion loss of 4. Both can provide complete dispersion compensation and remove entirely the memory effect associated to dispersion in the absence of fiber nonlinearity. Dscms can be delivered in a very small form factor.
Dispersion compensation module for 100gbits optical system and beyond article in optical fiber technology 173. Dispersion limits both the links bitrate and the maximum transmission distance that can be achieved through fiber. The dcm is a totally passive device consisting of a spool of special fiber dispersion compensating fiber dcf that has high negative dispersion. They exhibit low insertion loss, exceptional linearity and lowlatency operation. After light waves pass through the medium, the phases of light waves with different frequency components form a dispersion or separation effect. The trend in communications toward longer distances, higher bandwidths, and higher data rates has necessitated the use of dispersion slope compensation modules dscms also known as dispersion compensation module dcm dscms compensate for various types of chromatic dispersion accumulated throughout longdistance systems based on traditional direct modulation formats as well as systems using. The clearspectrum tdcmb is a compact chromatic dispersion compensation and emulation benchtop module for optical communication research labs.
The dcml has dominated the fbgbased dispersion compensation market because the provenreliable, compact modules are a totally passive solution that features ultralow latency and lowinsertionloss. Gs7000 dispersion compensation module dcm 7023358 cisco. Cisco gs7000 dispersion compensation module in digital transport systems, dispersion is a fiber property that causes light pulses to spread. Dispersion compensation module for longhaul dwdm system fs. Scdcf modules are inserted into the transmission line at uniform intervals and compensate the accumu lated chromatic dispersion so that optical signals are. Model otdcmgxx dispersion compensation module operating manual. Dispersion compensation module for longhaul dwdm system. Before learning about dispersion compensation module, wed first illustrate dispersion types in optical transmission systems. Dispersion compensation using highpositive dispersive optical fibers mohammad hadi, farokh marvasti, mohammad reza pakravan abstractthe common and traditional method for dispersion compensation in optical domain is concatenating the transmit optical.
In a specific medium, the phase velocity of light varies with frequency wavelength or transmission mode. The designed pcf shows high negative dispersion coefficient 264 psnmkm to 1410 psnmkm and negative dispersion slope, providing coarse dispersion compensation over the entire sband. Where to buy dispersion compensation modules, dcm, dcu. Dispersion compensation optical fiber modules for 40 gbps wdm. As dispersion compensation fiber is now gone, thanks to the progress of nonlinear mitigation in dsp, the constraint to reduce the footprint is now directly focused on compact design of tributaries. Dispersion compensation optical fiber modules for 40 gbps. With the mature and reliable optical fiber processing, the performance of optical transmission. D 17 psnmkm leaf 4000 km 250 km 15 km d 4psnmkm dai. Dispersion compensating fiber modules for dispersionshifted. Each spool is provided in a respective package, which can be slidably inserted into or removed from the housing along a track provided within the housing. Figure 1 shows schematic diagram of chromatic dispersion compensation in optical transmission system. Typical dispersion compensation modules can increase the total fiber length by as much as 65%, while. These are passive devices that are intended for signals in the 1550 nm range.
Dispersion compensation using highpositive dispersive. The dcms are available as part of vialites rain fade diversity link system and each dcm can be supplied in 5 km increments. Dcms dispersion compensation modules the optelian dispersion compensation module dcm cards enable extended reach of dwdm services. Sep 24, 2002 consistent with the present invention, a dispersion compensation module is provided which comprises a housing accommodating one or more spools of dcf. The clearspectrum tdcmb is a tunable, fully integrated emulator compensator that provides accurateand dynamic control of chromatic dispersion for test and measurement applications. By providing a negative dispersion, fiber with high positive dispersion can be fully compensated.
The scdcf has realized a targeted dispersion slope compensation ratio, which require the highest relative dispersion slope rds. We will use an ideal dispersion compensation fbg as the dispersion compensation module see figure 6. The value and the spectral position of the dispersion minimum vary with the radius of. Typically, such a module provides a fixed amount of dispersion, but tunable dispersion modules are also available. The dcm modules are available with any dispersion values from 20km to 120km compensation distance, and can be used both for single channel and multi channels dwdm optical fiber communication systems. Dispersion compensation module as a polarization hinge.
Dispersion compensation techniques for optical fiber. The link distance minus the transmission distance of the optical module is the minimum compensation distance, on this basis need to add 20km to ensure enough compensation. Although dispersion is minimized, it is still present. The trend in communications toward longer distances, higher bandwidths, and higher data rates has necessitated the use of dispersion slope compensation modules dscms also known as dispersion compensation module dcm. The otdcmg series fiberbased dispersion compensation module removes distortion from optical signals that have traveled long distances over standard, positive dispersion, smf28 fiber. The olson technology otdcmf series dispersion compensation module operates near 1550nm where ndsf dispersion has a typical value of 17psnmkm. The dcmc20, c40, c60, c80 and c100 cards are passive dispersion management elements that can. The dispersion compensation modules are building blocks of the fs. In this article, we provide an overview of some of the driving factors that limit the performance of optical links and highlight some of the potential opportunities for the signal processing community to make substantial contributions. The idea of using dispersion compensation fiber for dispersion compensation was proposed as early as in 1980 but, until after the invention of optical amplifiers, dcf began to be widespread attention and study. The olson technology otdcmg series dispersion compensation module operates near 1550nm where ndsf dispersion has a typical value of 17psnmkm. Dispersion techniques dispersion compensating fibers fiber bragg grating electronic dispersion compensation digital filters optical phase conjugation techniques 7. Ncnh dc4520 dispersion compensation module data sheet arris.
Rp photonics encyclopedia dispersion compensation modules. In digital systems, this dispersion limits the maximum transmission distance at a given data rate and causes increased ber. A variety of optical dispersion compensation odc techniques have been implemented and many are practical at lower data rates. Dispersion compensation schemes a system perspective. Dispersioncompensating fiber an overview sciencedirect. An optical module for chromatic dispersion compensation comprises an optical fiber wound so as to present a variable radius of curvature. Dispersion compensation module, dispersion compensation. Ep15349b1 chromatic dispersion compensation module. Tdcmb tunable dispersion compensation module benchtop.
Abstract we study polarization rotations by a dispersion compensation module responding to quasiperiodic room temperature oscillations. The fiber has an index profile such that it has, for the main propagation mode, a negative dispersion value having a minimum at a given wavelength in a given spectral band. The simulated inline dispersion compensated system is the same as that in figure 8. The rotations seems to have a functional temperature dependence on short time scales interupted by rather abrupt shifts occuring, on average, every month. In this work, high performance dispersion compensation fiber modules dcfms were developed and applied for the 40 giga bitrate systems.
Apr 27, 2017 how a dispersion compensating module reduces chromatic dispersion. This paper will introduce two kinds of dispersion and illustrate dispersion compensation module solutions for longhaul dwdm system. Electronic dispersion compensation university of illinois. Dispersion compensation module for 100gbits optical system.
The arris dcm series is a product family of dispersion compensation modules that increase the transmission distances of 1550 nm analog and digital signals. A wide variety of dispersion compensation module options are available to you. Static and tunable dispersion compensation modules for access, dci and legacy communication systems. Tunable dispersion compensation module benchtop teraxion. Us7197219b2 chromatic dispersion compensation module. Dcm dispersion compensator has the capability of slope compensation which can supply the broadband dispersion slope compensation for smf28 fiber g. How does a dispersion compensating fiber reduce chromatic. A dispersion compensating module or dcm is used to compensate the cumulative dispersion in a single mode fiber and a dispersion coefficient is used to characterize the dispersion value. Pdf dispersion compensation module as a polarization hinge. Dispersion compensation an overview sciencedirect topics. Clearspectrum tdcmb tunable dispersion compensation.
Dispersion compensation modules are modules used for dispersion compensation, e. Dispersion compensating fiber module semantic scholar. The trend in communications toward longer distances, higher bandwidths, and higher data rates has necessitated the use of dispersion slope compensation modules dscms also known as dispersion compensation module dcm dscms compensate for various types of chromatic dispersion accumulated throughout longdistance systems based on traditional direct modulation formats as well. Fs dispersion compensation module fully uses of dcf tech for compensating dispersion in optical fiber with 140km max. Teraxions fbgbased dcml have been widely deployed as essential components of regional and metropolitan networks for more than 15 years.
Performance analysis of dispersion compensation in long haul. Fs dcm is a purely passive module that provides negative dispersion for dwdm transmission systems, increasing transmission range and decreasing ber of optical links. In optical fiber communications, dispersion compensation modules dcm also called dispersion compensation units, dcu can be used for compensating the chromatic dispersion of, e. In this case, we selected a post compensation scheme because it is simple compared to the symmetrical compensation scheme. Keywordsfiber optics communications, dispersion, disper sion compensation. Dispersion compensation fibers and the modules are promising technologies, so they have been receiving more and more attention in recent years. Dispersion compensating fiber dcf provides an optical medium with a relatively large negative chromatic dispersion factor d. State of the art proximion offers the worlds only fbgbased continuous dispersion compensation modules dcms. Tens of thousands of units are deployed in networks worldwide, today compensating for dispersion in links that spans more than six laps around the globe.
The instrument features teraxions fiberbragg grating fbg technology. Prisma dispersion compensation module in digital transport systems, dispersion is a fiber property that causes light pulses to spread. Dispersion compensation module dcm a dispersion compensation module also called a dispersion compensation fiber dcf provides fixed chromatic dispersion compensation for diverse and disaster recovery dwdm networks. Since dispersion is inevitable in optical fibers, dispersion compensating fibers, such as those sold on this page, can be incorporated into optical systems. Dispersion compensation module concept of dispersion. Dcm contains custom designed passive fiber optics designed to reverse the effects of dispersion in. Proximion offers the worlds only fbgbased continuous dispersion compensation modules dcms. Low loss chromatic dispersion emulators and compensators available for lab use. Nov 16, 2010 dispersion compensation was originally proposed to equalize pulse distortion. How a dispersion compensating module reduces chromatic dispersion.
Specsheet pdf clearspectrum tunable dispersion compensation module benchtop. Design and simulate a fiber optic system using dispersion compensating fiber to reduce chromatic dispersion. Customized dcfbased dispersion compensation module fs. Dispersion compensation module dcm is designed to fix the form of optical signals that are deformed by chromatic dispersion and compensates for chromatic dispersion in fiber that causes the light pulses to spread and generate signal impairment. With the development of wavelength division multiplexing wdm techniques for large capacity optical communication systems, dispersion compensation technologies have been applied into the field. Clearspectrum tdcmb tunable dispersion compensation module. Using a dispersion compensation fiber is one such optimal solution.
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