High frequency analog RF photonic links are desirable to reduce the size, weight and power of RF systems by offering the replacement of lossy, bulky coaxial RF cabling for lightweight, low loss and broadband optical fiber. This talk presents an overview of high-performance photodiodes for analog photonic links, highlighting recent advances both from the perspective of products and technology in the commercial space, as well as a few notable demonstrations from research institutions over the past year.
Freedom Photonics and the University of Virginia have developed high power, wide-bandwidth balanced photodetectors based on vertically-illuminated modified uni-traveling carrier (MUTC) photodiode technology. These balanced pairs are based on single photodiodes which achieve 3-dB bandwidths of 25 GHz, coupled with output powers above 23 dBm, as well as 35 GHz photodiodes with output powers greater than 19 dBm. A balanced configuration of these devices offers advantages in common-mode noise reduction, increasing the signal-to-noise ratio. In a photonic link, high-power, balanced photodiodes support high link gain and large bandwidths, while the high linearity of these devices maximizes spurious-free dynamic range (SFDR).
Recent advances in Vertical-cavity Surface-emitting Laser (VCSEL) efficiency and packaging have opened up
alternative applications for VCSELs that leverage their inherent advantages over light emitting diodes and edge-emitting
lasers (EELs), such as low-divergence symmetric emission, wavelength stability, and inherent 2-D array fabrication.
Improvements in reproducible highly efficient VCSELs have allowed VCSELs to be considered for high power and high
brightness applications. In this talk, Aerius will discuss recent advances with Aerius' VCSELs and application of these
VCSELs to miniature optical sensors such as rangefinders and illuminators.
There are several characteristics of laser diodes that influence the performance of a magneto-optical (MO) storage device. A few of the important optical characteristics include divergence angles, wavelength, astigmatism, polarization, and power output. Due to the large variation in these characteristics from commercial devices, compromises must be made in order to design an optical system that is manufacturable. In this paper we discuss how variations in the laser optical characteristics affect spot quality on the recording medium. Optical characteristics of a sample population of laser diodes are measured, and a hypothetical optical system is evaluated.