Abstract
In
this paper, the available analog link performance of integrated transmitters
containing a sampled-grating distributed Bragg reflector laser, a semiconductor
optical amplifier, and a modulator is evaluated. It is found that to provide
a link gain and a low-noise figure, an RF preamplifier is required, and for
this reason, spurious-free dynamic range (SFDR) including a preamplifier
has been evaluated. An SFDR of 110-dBHz<sup>2/3</sup>, a noise figure of 5.4 dB, and link gain of 6.9 dB at 5 GHz is
obtained. It is further investigated how link SFDR can be improved by linearization
techniques. Two novel approaches are proposed and demonstrated: first, predistortion
by extraction of nonlinear components from an integrated second modulator
exposed to the same wavelength, optical power and temperature for matched
nonlinear terms; second, a novel linearized modulator configuration balancing
electroabsorption and Mach–Zehnder modulation that can reach a null
for both second- and third-order intermodulation products
at a single bias point.
© 2008 IEEE
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