Field Guide to Optical Fiber Technology (SPIE Field Guide by Ruediger Paschotta
By Ruediger Paschotta
Fiber optics became one of many crucial parts of contemporary optical expertise. Early paintings has typically fascinated by the transmission of sunshine over lengthy distances, relatively to be used in optical fiber communications. additional paintings has enormously extended the appliance parts of optical fibers, which now additionally contain fields like fiber amplifiers, fiber lasers, supercontinuum iteration, pulse compression, and fiber-optic sensors. This range of purposes has been enabled via numerous forms of optical fibers, that may enormously fluctuate in lots of respects. This box consultant offers an summary of optical fiber expertise. It not just describes many differing types of fibers and their houses, but additionally provides in a compact shape the proper actual foundations. subtle arithmetic, e.g., pertaining to fiber modes, should not integrated, as such matters are lined intimately via numerous textbooks. either passive and lively (amplifying) fibers are mentioned, and an outline on fiber nonlinearities and the applying of energetic fibers in amplifiers and lasers is integrated. the massive bibliography comprises many beneficial references, masking either pioneering paintings and later seminal articles and books. This advisor will be very worthy for a large viewers, together with practitioners in in addition to researchers.
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Example text
As a result of temperature changes. For broadband signals, PMD can introduce a pulse chirp similar to that which occurs due to chromatic dispersion. In that way, complicated pulse shape distortions can arise. For fiber sections with a length of at most a few meters, the DGD evolves in proportion to the fiber length. s. value of the DGD scales only with the square root of the fiber length. s. value. For such reasons, the average degree of pulse broadening in a telecom system by PMD should usually not be more than a few percent of the signal pulse duration.
12. The nonlinear coefficient mostly depends on the fiber properties and less on the wavelength. 3 mrad/W·m. 3 rad. Because ultrashort pulse fiber amplifiers easily generate peak powers of many kilowatts and can be several meters long, strong nonlinear phase shifts can occur. Therefore, chirped-pulse amplification (with strongly stretched pulses) is required for high pulse energies. Some photonic crystal fibers (p. 55) have small mode areas of the order of 10 m2, leading to values of >10 mrad/W·m in the visible or near-infrared spectral range.
Various variants of this technique can be implemented with fibers: Pulses that are originally unchirped can be spectrally broadened in a normally dispersive optical fiber and then dispersively compressed in a fiber with anomalous dispersion or in some other optical element, such as a pair of diffraction gratings. fiber dispersive compressor The useful fiber length is limited by the temporal pulse broadening, which leads to a reduction in peak power. Substantial pulse compression requires a sufficiently high peak power of the input pulses.