Abstract
A free-space optical (FSO) receiver with high optical alignment robustness configured by a single optical lens is presented, in addition to a newly developed 2-D photodetector array (2D-PDA). A 6 × 6 square-shaped aligned arrangement matrix structure in the 2D-PDA provides a large active area for photodetection. In a 1.5-m FSO demonstration, the optical alignment tolerance on the receiver's lens is evaluated to be as large as 12 mm. The multiple-output signals from the 2D-PDA are used for the maximum ratio combining method in space diversity. The system design and alignment tolerance without a mechanical beam-tracking system are presented and the bit error rate contributed by space diversity is discussed.
Highlights
D ATA traffic in wireless communications and fixed-fiber communications is increasing owing to the high demand for the Internet or intranets, such as social networking services and cloud computing, year by year
A 2-D photodetector array (2D-PDA) device consisting of InGaAs-based III–V compound material was designed based on a PIN photodiode (PIN-PD) structure
An obvious difference with and without space diversity was be was applied to wireless communication, and it was found that the bit error rate (BER) improved with an increase in combining output element numbers in the 2D-PDA
Summary
D ATA traffic in wireless communications and fixed-fiber communications is increasing owing to the high demand for the Internet or intranets, such as social networking services and cloud computing, year by year. A free-space optical (FSO) system with an octagonal aligned rack layout configuration was proposed [12], [13], in addition to the use of sealing mirrors to switch FSO beam paths [14]. Another application of optical wireless (FSO) communication is for indoor application or front-haul applications in access networks. In a demonstration of high-data-rate 100-Gbps FSO communication, four-color WDM beam detection by the 2D-PDA in free space has been achieved [32]. The FSO design and characteristics using the 2D-PDA and the BER performance with space diversity are discussed
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