Optical wireless communications utilizing a dicode PPM PIN‐BJT receiver

Abstract

A new type of stacked meander-chip antenna using LTCC multilayer technology for dual-band operation with dimensions of 9 ϫ 15 ϫ 1.2 mm has been proposed. By changing the vertical and horizontal lengths of the meander antenna properly, we can obtain the desired resonant frequency. With the 2.0:1 VSWR impedance bandwidth definition, the lower and upper bands have impedance bandwidths of 80 and 120 MHz, respectively, covering the bandwidth of the GPS and K-PCS bands. Satisfactory agreement between the simulated and measured results for the antenna patterns and impedance bandwidth have been achieved. Therefore, the proposed antenna is suitable for practical applications that require a small chip antenna in a mobile-communication system.

Performance evaluation of optically preamplified dicode pulse position modulation receivers

“…Early work on DiPPM also includes work on optical wireless communications [2] and spectral characterisation [3]. The operation of PPM has been widely investigated in relation to different receiver configurations and is known to offer significantly higher sensitivity than receivers detecting standard on-off keyed non-return-tozero (OOK NRZ) modulation but at the expense of bandwidth [4][5][6].…”