Abstract
It is always necessary to use modulators in order to modulate the lightwave with signals including information. There are three main methods in modulation; direct, internal modulation, and external modulation. The direct modulation method is represented by semiconductor laser diodes, where injection current for the laser diode is changed by signals. This has been used for a long time for lightwave transmission systems. The second method is used for changing the Q in the cavity of solid state lasers by inserting the modulators. The lasing condition is very sensitive to losses in the cavity and only a low percentage modulation index results to sufficiently operate the lasers because a small change in the loss can stop even lasing. This method is highly efficient, but it is difficult to obtain stable lightwave signals due to the relaxation oscillation of lasers associated with modulation. However, this method is necessary to use a laser as actively mode-locking that genarates ultrashort and repetitive optical pulses fixed by the cavity length. The third method is very popular and various types are used when its large insertion loss is not a serious problem. The structure of internal modulators is also similar to that of external modulators. Therefore, in this chapter we focus mainly on the external modulators.
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Wakita, K. (1998). Electrooptic Modulation. In: Semiconductor Optical Modulators. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6071-5_3
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DOI: https://doi.org/10.1007/978-1-4615-6071-5_3
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