Abstract
We present two types of Si photonics-wireless interface (PWI) integrated circuits (ICs) realized in standard Si technology. Our PWI ICs convert optical signals into radio-frequency (RF) signals for downlink remote antenna units in fiber-wireless networks. Characterization and modeling of Si avalanche photodetectors (APDs) fabricated in two different Si technologies are carried out and used for PWI IC design. A 5-GHz RF-over-fiber PWI IC composed of APD, preamplifier, and power amplifier (PA) is fabricated in 0.18-μm CMOS technology and its performance is verified by 54-Mb/s wireless local area network data transmission. A 60-GHz baseband-over-fiber PWI IC containing APD, baseband photoreceiver, 60-GHz binary phase-shift keying (BPSK) modulator, and 60-GHz PA is realized in 0.25-μm SiGe BiCMOS technology. Error-free transmission of 1.6-Gb/s BPSK data in 60 GHz with this PWI IC is successfully achieved.
Highlights
remote antenna units (RAUs) IndoorRF: Radio Frequency IF: Intermediate Frequency photonics-wireless interface (PWI): Photonics-Wireless Interface Remote Node Optical Fiber Outdoor Broadband Access CO NetworkCO: Central Office RAU: Remote Antenna Unit
We report two types of PWI integrated circuits (ICs) realized in standard CMOS and BiCMOS technologies
Our PWI IC is optimized for a target application of 54Mb/s 64 quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) 802.11 5-GHz wireless local area network (WLAN) data application
Summary
RF: Radio Frequency IF: Intermediate Frequency PWI: Photonics-Wireless Interface. With the wide spread of various mobile devices that are continuously demanding more data capacity and better accessibility, smart and efficient techniques for linking fiber-based wireline networks with wireless networks are in great demand. The IF-over-fiber scheme shown in Fig. 2(b) lessens the bandwidth requirement of photonic devices, but RAU has to perform frequency up-/down-conversion with an electrical frequency synthesizer. The baseband-over-fiber RAU shown in Fig. 2(c) is the most complex because it has to perform data modulation and demodulation as well as up-/down-conversion This scheme can offer flexibility in network operation since MAC protocols for optical and wireless networks can be separated [5]. The first type PWI IC realized in 0.18-μm CMOS technology detects 5-GHz modulated optical data, performs amplification, and produces 5-GHz wireless signal as is required for RF-over-fiber scheme. The second type PWI IC realized in 0.25-μm SiGe:C BiCMOS technology detects and amplifies baseband optical data, performs binary phase-shift keying (BPSK) modulation in 60 GHz, and produces 60-GHz BPSK signal for baseband-over-fiber scheme.
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