文档介绍：IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 24, NO. 7, APRIL 1, 2012 617
Optimization of Optical Modulator for LTE RoF
in Nonlinear Fiber Propagation
Thavamaran Kanesan, Student Member, IEEE,WaiPangNg,Senior Member, IEEE,
Zabih Ghassemlooy, Senior Member, IEEE, and Joaquin Perez, Member, IEEE
Abstract— This letter proposes an optimized launch power the fiber nonlinearity [3]. It is important to optimize the DFB
for the direct detection of optical orthogonal frequency-division modulator taking into consideration the PFC effect. This is
multiplexing (DD-OOFDM) for radio-over-fiber (RoF). The aim because the PFC induces signal spread similar to the chromatic
is to optimize the physical layer connectivity for the third
generation partnership program—long-term evolution employing dispersion (CD) and thus jointly contributing to the signal dis-
RoF technologies. We also analytically derive an expression for tortion over a long propagation span. Therefore, it is desirable
the distributed-feedback laser, laser-induced positive frequency to employ a chirp free external modulator in long haul fiber
chirping, incorporating the phenomena that induce phase distor- communications, thus making it superior to the IM DFB.
tion at the receiver, and explicitly explain the transient chirp of Relative to the PFC effect, we introduce a new analytical
DD-OOFDM. Results show that transmiss