By Michael Bass, Eric W. Van Stryland, Optical Society of America
Fiber optics is the most well liked subject in communications and this ebook from the world's best specialists truly lays out all of the info of optical communications engineering * crucial technical consultant and suggestions package for the super-fast, super-broad fiber structures and units powering the fastest-growing communications infrastructure * tools for producing above top functionality * transparent reasons and solutions to tricky demanding situations for WDM, DWDM, amplifiers, solitons, and different key applied sciences
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Fiber optics is the most popular subject in communications and this booklet from the world's prime specialists in actual fact lays out all of the info of optical communications engineering * crucial technical advisor and suggestions package for the super-fast, super-broad fiber structures and units powering the fastest-growing communications infrastructure * equipment for producing above height functionality * transparent reasons and solutions to difficult demanding situations for WDM, DWDM, amplifiers, solitons, and different key applied sciences
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Additional info for Fiber optics handbook: fiber, devices, and systems for optical communications
Reliability Assessment The reliability of an optical fiber is of paramount importance in communications applications—long links represent large investments and require high reliability. There will, of course, always be unforeseen reliability problems. Perhaps the most famous such example was the fiber cable design on the first transatlantic link—the designers had not quite appreciated the Atlantic shark’s need for a high-fiber diet. The sharks, apparently attracted by the scent of the cable materials, made short work of the initial cable installations.
For homodyne detection, the signal envelope carries twice the energy, and 4ηHET R2PS PLO SNR = ᎏᎏ2 2e RPLO Bn + σ T (36) For a given modulation scheme, homodyne detection will therefore be twice as sensitive as heterodyne. Modulation Formats. The modulation formats appropriate for coherent optical communications can be summarized as follows: 1. Amplitude-Shift Keying (ASK). This technique is simply on-off keying (similar to simple intensity modulation) but with the important constraint that the frequency and phase of the laser be kept constant.
The noise contributions from amplifiers other than the first stage are generally second-order corrections. Figure 19 shows a schematic of the receiver and relevant noise sources. Table 3 gives expressions for, and definitions of the important physical quantities which determine the receiver sensitivity. Figure 20 illustrates two possible configurations for the detector/amplifier combination. Of these, the integrating front end is the simplest (particularly for high-frequency operation) but tends to be slower than a transimpedance amplifier with an equivalent load resistance.