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- W2316198013 abstract "For the sinusoidal technique to generate a similar number of teeth, modulation depths greater than this are needed (Fig. 4), hence the need for higher modulation voltages (tens of volts). It is clear from this that the spectral width of the sinusoidally generated comb will be limited by either the output capabilities of practical power amplifiers, or by the electrical input limitations of optical modulators. The main advantage of the sinusoidal modulation technique is that the number of teeth generated is determined only by the modulation depth. The reason for this is that the number of Bessel sidebands, and hence the spectral width of the comb, is independent of the modulation bandwidth. Unlike the sinusoidal technique, the pulse approach requires broad bandwidth power amplifiers and optical modulators because the rectangular modulation pulse shape must be preserved. The outcome of this is that the lowest bandwidth device determines the maximum spectral width of the comb, which for a specified number of teeth places an upper limit on the frequency separation that can be used between them. For a reasonably sized comb, the several GHz bandwidth of present-day power amplifiers will probably limit the maximum separation frequency to sub-GHz values, whereas for the sinusoidal case, values exceeding an order of magnitude larger are in principle feasible. Conclusions: The optical frequency combs generated by a pulse and a sinusoidally driven Mach-Zehnder have been compared. The pulse drive has been shown to have the advantage of using a low drive voltage, and that the limited electrical bandwidths of present power amplifiers will restrict its use to generating combs with sub-GHz tooth spacings. If larger spacings are required, values of up to several tens of GHz should be possible by using a sinusoidal drive, provided the higher voltage requirements can be met." @default.
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- W2316198013 date "1989-01-01" @default.
- W2316198013 modified "2023-10-17" @default.
- W2316198013 title "MINIMUM EUCLIDEAN DISTANCES OF PARTIAL RESPONSE MULTI4 PHASE-CODED MODULATIONS WITH ASY M M ETRlC M ODU LATlON IN DICES" @default.
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