Cox III C.H.'s Analog optical links PDF

By Cox III C.H.

ISBN-10: 0521621631

ISBN-13: 9780521621632

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12) with respect to VM and solving for the value of VM that maximizes the result. 13). e. 13) as well. These substitutions yield a relationship between the small-signal modulation voltage and the resulting intensity modulated optical power: π vm TFF PI pm,o ∼ . 14) This is half of what we need to express the incremental modulation efficiency. The other half requires us to have the low frequency, lumped-element electrical circuit model for a MZM. At low frequencies – typically less than 1 GHz – the modulator electrodes form a capacitor, CM .

E. ηl ≤ 1 when the laser facets are asymmetrically coated so that all the optical power is emitted from one facet. 6) is its wavelength dependence. 5) is the ratio of optical power to electrical current. And whereas the current is independent of wavelength, the energy of the photons comprising the optical power has a wavelength dependence. Thus the same differential quantum efficiency will lead to two different slope efficiencies at two different wavelengths. 09 W/A. As this example makes clear, although the upper bound on ηl is one, the upper bound on sl is a number greater or less than 1 W/A, depending on the wavelength.

Within the cavity via either gain or index guiding. One of the ancillary benefits of a vertical cavity laser is that since there is rotational symmetry in the cavity about the vertical axis, the emitted beam is circular. This circular beam – as opposed to the elliptical beam of in-plane lasers – is one of the contributing factors to the increased fiber-coupling efficiency of VCSELs. The VCSEL cavity is short enough so that only one of its Fabry–Perot modes falls within the semiconductor gain peak.

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Analog optical links by Cox III C.H.


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