Resistor Inductor Capacitor Impedance Optimization of Violet Laser Diodes for Free-Space Quadrature Amplitude Modulation Orthogonal Frequency Division Multiplexing Data Link
Journal
IEEE Transactions on Industrial Electronics
Journal Volume
68
Journal Issue
8
Pages
7684-7692
Date Issued
2021
Author(s)
Abstract
To optimize the high-speed modulation package of the TO-can mounted violet laser diode (VLD) for optical wireless communication, three different impedance matching methods with adding or removing resistor/inductor/capacitor (R/L/C) elements are employed to discuss their effects on the direct encoding bandwidth of the VLD. With reducing the parasitic inductance by shortening the cathode/anode pin length of the TO-can VLD, the 2.5-mm-long pin acts as a series inductance to 1.74 nH to enormously improve the modulation bandwidth of the VLD for encoding the 16 quadrature amplitude modulation orthogonal frequency division multiplexing data as high as 20.4 GB/s. Neither the surface mounted device (SMD) resistor nor the SMD inductor in series connection can further improve the modulation bandwidth of the VLD. In contrast, a parallel connection of the VLD with Teflon ring capacitor can somewhat broaden its encodable bandwidth at low biased conditions, whereas the allowable bandwidth still degrades when increasing the VLD bias to enlarge its modulation throughput. Numerical simulations also verify that the shortening pin length (with reducing the inductance) of TO-can VLD is the best selection for bandwidth enlargement. With optimized impedance matching design, the comparison on data transmission characteristics for several 2.5-mm-pin VLDs with different rated powers is presented. ? 1982-2012 IEEE.
Subjects
Impedance matching
light-fidelity (Li-Fi)
optical wireless communication (OWC)
violet laser diode (VLD)
visible light communication
Bandwidth
Electric connectors
Encoding (symbols)
Impedance matching (electric)
Inductance
Optical communication
Orthogonal frequency division multiplexing
Quadrature amplitude modulation
Resistors
Semiconductor lasers
Signal encoding
Surface mount technology
High-speed modulation
Impedance matchings
Modulation bandwidth
Optical wireless communications
Parallel connections
Parasitic inductances
Series connections
Violet laser diodes
Frequency modulation
Type
journal article