In this article, we discuss the role played by color dispersion (CD) when simulating optical performance and cumin to arrange fiber during fiber test procedures (RFOF), as well as introducing valuable strategies to relieve effective effects of their harmful effects.
The importance of getting rid of color dispersion when testing high -frequency RFOF devices
The color dispersion is a decisive factor in the performance of RFOF systems, especially when the fiber infrastructure is repeated to test, reception devices and high -frequency devices. This visual property arises due to the speed based on the wavelength of light in the optical fibers, causing the signaling and deterioration. Due to the unwanted effects that cause them, the disposal of color dispersion is necessary during test procedures to achieve the most accurate and improved performance results of RFOF devices and systems.
The effects of color dispersion on high -frequency RF signals
There are several methods that negatively affect the visual signal:
Distorting the stage and capacityHigh -frequency RF signals are very sensitive to phase changes. CD causes different spectral components to refer to different speeds, which leads to phase shifts and capacity changes, which can distort modification charts including QAM and OffM.
Signal integrity and deciding error rate (BER): ISI deformities (ISI) increases the integration of a humiliating signal in increasing BER, especially in high -speed communication applications. As the frequency increases, the color dispersion increases, so the connected devices often face more difficulty in distinguishing between individual bits. For example, the elimination of a compressed disk may not be considered when testing 1 GHz devices is not important as eliminating it in a 40 GHz system where the effects of the CDs are significantly more important.
Decrease in the systematic range of system and dynamic domain: Since dispersion causes a widespread visual signal at the distance and time, it reduces the width of the available frequency range and reduces the dynamic range, thus reducing the performance of transportation and system performance.
Valuable strategies to eliminate color dispersion in RFOF test applications
For testing and evaluating the most important performance of the high -frequency RFOF device in the laboratory, the best practices are the use of fiber network simulation devices for repetition of the accurate intended optical fiber structure that connects to the devices. When specifying the microscopic fibers with complete lengths by distances or the intended RFof network delay values, the visual performance properties of the field network are experienced in the test laboratory. As part of the testing test, there are many methods that one may think to get rid of or significantly dispersed the color dispersion:
Use the dispersion compensation fibers (DCF)Designer and constructive to provide negative dispersion factor, DCF denies the effects of color dispersion. A suitable length of DCF can be achieved to get rid of the CD for the transmission fibers by a quick account based on the values of the CD performance concerned for each type of fiber, along with the length of the transport fibers.
Technical note: Since the signal transmission time is an important property of evaluation when testing the performance of the RFOF system, visual delay specialized in optical time (also referred to as optical delay lines) can be an excellent solution in setting a network simulation. These fibers are created by combining the transmission and fibers that compensate for dispersion in a continuous length that provides the value of the delay of time/micro -time required for the application while also getting rid of the effects of the CD.
Use non -zero -scattered fibers (NZDSF): Its classification by ITU, such as G.655, a single mode fiber, is designed to significantly reduce color dispersion, in some cases up to 75 % or more compared to standard G.652 fibers, although not completely disposed of it. Examples of the famous G.655 fiber include Corning® Leaf® and Offs® TrueWave-RS®.
The transmission of the visual wavelengthLaser use with a very narrow line width can reduce the effects of dispersion.
Electronic and digital signals (DSP)Using adaptive equation techniques and DSP technologies to correct distortions caused by dispersion in actual time during tests.
It should be noted that due to the increase in the effects of the CDs with an increase in the length of the fiber, some may recommend using shorter lengths than fiber in preparing the test as a way to reduce dispersion. Unfortunately, this approach is ineffective because it will not provide accurate representation of the intended network. Fiber transmission time will be incorrect due to the lack of full lengths of the fiber, while other important visual performance properties, including the overall attenuation values, will be completely different.
With fiber -fiber devices and networks depend on supporting advanced space, military, satellites, swords, and mobile communications, it is important to invest in fiber network simulation solutions that include integrated capabilities to get rid of the effects of harmful color dispersion. This allows the most accurate and improved test measurements, allowing the most effective decision -making around RFOF devices and network parameters before providing significant obligations to resources.
Select the dispersion compensation solution for the following RFOF application
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