Abstract
A lightwave transmission system employing a centralized-light-source and vertical-cavity surface-emitting laser (VCSEL)-based upstream wavelength selector in two-way transmission is proposed and successfully demonstrated. The transmission performances of cable television (CATV), millimeter-wave (MMW), and baseband (BB) signals are investigated in a bidirectional way, with the assistance of the centralized-light-source and VCSEL-based upstream wavelength selector on the transmitter side. Extra optical components, such as a reflective semiconductor optical amplifier (RSOA), Fabry-Perot laser diode (FP LD), and phase modulator (PM), and the elaborated injection-locked technique are not required for upstream modulation, which largely reduce the cost and complication of two-way lightwave transmission systems. Excellent transmission performances of the carrier-to-noise ratio (CNR), composite second-order (CSO), composite triple-beat (CTB), and bit error rate (BER) are obtained over a 25-km single-mode fiber (SMF) transmission with 100-m free-space link/5-m RF wireless transmission. This proposed two-way lightwave transmission system shows a convenient and economic eminent structure.
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