Active Pre-Equalizer for Broadband Optical Wireless Communication Integrated with RF Amplifier

Presented within this paper are the findings and illustrated a new methodology for the design and development of a pre-equalizer utilizing method optimized filter synthesis, which can expand the bandwidth of optical wireless communication as required. The design circuit consists of an active-passive hybrid equalization circuit using the passive RC high pass filter cascaded with the non-inverting active Sallen-Key amplifier and the RF broadband amplifier circuit. The design shows that at -3 dB bandwidth of the optical wireless communication can expand the frequency bandwidth of 1 MHz to 700 MHz. Additionally, it can amplify the input signal to compensate for the attenuation in the frequency operation range of 18 dB. However, the proposed pre-equalizer system offers various preferable features as it can expand the bandwidth to be higher and the input signal can be amplified. Also, it shows the real experimental results demonstrating an improvement of bandwidth.