2 edition of Measurement of optical fiber bandwidth in the time domain found in the catalog.
Measurement of optical fiber bandwidth in the time domain
Douglas L Franzen
by Dept. of Commerce : National Bureau of Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off. in Washington
Written in English
|Statement||Douglas L. Franzen, G. W. Day, Electromagnetic Technology Division, National Engineering Laboratory, National Bureau of Standards|
|Series||NBS technical note ; 1019, NBS technical note -- 1019|
|Contributions||Day, G. W., joint author, United States. National Bureau of Standards, National Engineering Laboratory (U.S.). Electromagnetic Technology Division|
|The Physical Object|
|Pagination||iv, 65 p. :|
|Number of Pages||65|
Abstract: The optical frequency-domain reflectometry (OFDR) sensing system and signal processing method, which is based on the short-time Fourier transform, enable us to interrogate reflected wavelengths of fiber Bragg gratings (FBGs) and their relative position along the optical fiber with high spatial resolution. An FBG is an optical fiber with an appropriately inscribed periodic refractive Cited by: 2. • The fiber optic cable is much lighter and smaller than copper cable. Therefore, fiber optic cables can contain a large number of fibers in a much smaller area. For example, a single fiber cable can consist of fibers. • Optical fiber is reliable and very flexible. • Optical fiber has a File Size: 6MB.
measure of the potential information carrying capacity of the fiber. Bandwidth is specified in the frequency domain, but can be measured in either the time or frequency domains. SP describes methods for obtaining ps duration pulses from laser diodes for time-domain measurements, along with methods for launching the light into the fiber. Included are the results of bandwidth measurements on multimode telecommunication grade fibers. Finally, the PSA method is compared to other bandwidth measurement methods: the frequency domain (FD) and the time domain (TD) by: 1.
This is the most authoritative, complete source of test and measurement information for engineers who design and maintain fiber optic book presents measurement principles for characterizing all three basic components of a fiber optic communication system: the optical transmitter, fiber medium and optical receiver. It also covers system level measurements, and discusses the. A variation of the cutback technique is the substitution method, in which measurements are made on a full length of fiber, and then on a short length of fiber having the same characteristics (core size, numerical aperture), with the results from the short length being subtracted to .
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Measurement of Optical Fiber Bandwidth in the Time Domain. Published. February 1, Author(s) Douglas L. Franzen, Gordon W. by: 4. texts All Books All Texts latest This Just In Smithsonian Libraries FEDLINK Measurement of optical fiber bandwidth in the time domain Measurement of optical fiber bandwidth in the time domain by Franzen, Douglas L.; Day, G.
Topics Optical communications., Fiber. Get this from a library. Measurement of optical fiber bandwidth in the time domain. [Douglas L Franzen; G W Day; National Engineering Laboratory (U.S.).
Electromagnetic Technology Division.; United States. National Bureau of Standards.]. A system for determining optical fiber bandwidth from time domain information is described. A measurement gives the optical fiber transfer function (or frequency response) relating the output waveform to the input.
An analysis is given of the variables affecting the measurement. Chapter 10 has a good review of optical time-domain reflectometers (OTDRs) used in testing components, while chapter 11 explains the use of OTDRs in making measurements on optical fiber. Chapter 12 covers dispersion measurements, including 5/5(11).
IV Measurement of Optical Fiber Bandwidth in the Frequency Domain G. Day* National Bureau of Standards Boulder, Colorado The design, evaluation, and performance of a system for determining the magnitude of the transfer function (hence, the bandwidth) of a multimode optical fiber.
This chapter discusses some of the measurement problems associated with reflective events. The distance, after a reflection and before an optical time-domain reflectometers (OTDR) can make measurements, depends on the type of measurement one wants, the strength of the reflection, and the OTDR's bandwidth.
An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR is the optical equivalent of an electronic time domain reflectometer. It injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber.
An Optical Time Domain Reflectometer — “OTDR” for short — is an electronic-optical instrument that is used to characterize optical fibers. It locates defects and faults, and determines the amount of signal loss at any point in an optical fiber. The OTDR only needs to have access to one end of a fiber to make its measurements.
An OTDR takes thousands of measurements along a fiber. The fiber modal bandwidth can be measured in time domain, using a pulse of light launched into one end of the fiber and the temporal response of the output is measured.
Conversion into the frequency domain reveals the bandwidth from the transfer function H(f), which is defined as the earliest frequency at which the amplitude drops 3 dB below the amplitude at zero frequency.
The measurement of bandwidth of multimode optical fiber is an established technique. It has normally been made on drums of fiber in the laboratory and on installed fibers where the distant-ends have been looped.
In these cases both ends of the fiber are available at one location. This paper describes a technique developed for making time domain bandwidth measurements when both ends of the Author: S.
Ahmad, B. Allen. Chapter 4 - Optical Fiber Measurement Pages Publisher Summary Optical fiber is an indispensable part of fiber-optic communication systems; it provides a low-loss and wideband transmission medium. The performance of an optical fiber system depends, to a large extent, on the characteristics of optical fibers.
Principles of Optical Fiber Measurements focuses on the optical fiber systems, which are being added to the telephone networks of various countries around the world. This book explores the significance of optical fiber systems in the increasing variety of fiber-related products on the Edition: 1.
fiber-optic communication systems due to chromatic dispersion, which occurs in the fiber and limits the modulation bandwidth of the system. The effect of chromatic dispersion can be seen in the time domain as pulse broadening of a digital waveform.
Since chromatic dispersion is a function of the spectral width of the light source, narrowFile Size: KB. (Using bandwidth times length as a measurement makes SIGNAL PROCESSING IN OPTICAL FIBERS 0 50 0 1 Gaussian Pulse Envelope and Carrier Frequency Femtoseconds Amplitude after a distance z we then transform back to the time domain; File Size: KB.
In the reference arm, the optical power is split by a 90/10 fiber coupler. The 90% arm is detected by a 20 GHz detector. The electrical pulse train is then split by a 50/50 RF coupler to trigger the oscilloscope and provide a reference signal.
The 10% arm is Cited by: The measurement approach is referred to as incoherent optical frequency domain reflectometry (I-OFDR): the frequency response of the fibre under test is measured and transferred into its time.
A similar time domain measurement is also available. Based on a wide-bandwidth oscilloscope, it is called the time-domain reflectometer (TDR).
The instrument is. The longest wavelength at which A d (λ)/km is equal to dB is the fiber cutoff wavelength. The modal bandwidth of a multimode optical fiber can be measured by measuring the power transfer function H(f) of the fiber at the band frequency (f). THz pulse traces were recorded with a commercially available time-domain system employing an erbium doped fiber laser emitting optical pulses with a pulse width of fs at nm central wavelength with a repetition rate of MHz.
All measurements were done in ambient air. An optical fiber is a flexible, transparent fiber made by drawing glass or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data transfer rates) than.Troubleshooting Optical Fiber Networks offers comprehensive, state-of-the-art information about time-domain fiber-optic s will gain an understanding of how to troubleshoot optical-fiber networks using an optical time-domain reflectometer (OTDR), while learning the fundamental principles underlying the operation of these powerful testing instruments.5/5(3).
In this video, i have covered Dispersion Measurement with following outlines. 1. Dispersion Measurement 2. Basics of Dispersion Measurement 3.
Time Domain Intermodal Dispersion Measurement 4.