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Optimum Low Pass Filter Bandwidth for Generating Signals

From Thin Film Technology Corporation
 

 
Optical Duobinary modulation has been illustrated to have higher spectral efficiency in high capacity transmission [1], and have better tolerance to chromatic dispersions due to narrower spectral bandwidth [2]. It also enjoys higher threshold for the onset of stimulated Brillouin scattering (SBS) [3]. Various implementations of Duobinary transmitters have been discussed [4-5]. Among all of those, the implementation based on the three-level electric signals generated by electrical low pass filters (LPF) is the most cost-effective and shows best dispersion tolerances simultaneously [5]. In this format, the system heavily depends on the bandwidth of the LPF, which affects the pulse shape of the electrical signal. Nonetheless, the modulator and driving circuit's bandwidth, as well as driving voltage, also contributes to the pulse shape. It is well known that the fifth order electrical low pass Bessel filter having a 3 dB bandwidth equal to the quarter of the data rate, ~B/4, is typically used in the Duobinary transmitter to generate the Duobinary signal pattern, which is then used to drive an optical modulator to create the optical Duobinary signal [6-8].
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