We propose a wide field-of-view optical receiver design based on a fisheye lens and an off-axis catadioptric structure for free-space optical communications. The design utilizes a novel fisheye lens group to compress a wide field angle into a narrow field angle and produce the appropriately collimated light that can effectively be coupled into the following aperture of a catadioptric telescope....

Fully integrated imaging receivers present a method of low power free-space optical communication with advantages over radio frequency and single element optical communication for a variety of network scenarios. This paper discusses the theoretical performance of such receivers and the design of a single “smart pixel” for use in a 2.5 Mbps integrated CMOS imaging receiver. The receiver has a si...

In this work we present a high-speed optical receiver with external large-area photodiode. The optical receiver is realized in 0.35μm SiGe BiCMOS technology. The input circuit is a two-transistor transimpedance amplifier using an common-emitter and an emitter-follower configuration. An external silicon PIN photodiode of a squared area of 0.25mm2 with a rise time of 0.4ns at 850nm light is used....

Amplified Spontaneous Emission (ASE) noise mitigation from a pre-amp Erbium Doped Fiber Amplifier (EDFA) to the Photon Detector (PD) in optical receivers can be reduced by minimizing the EDFA ASE noise at the optical receiver level to achieve optimal optical receiver transmission performance. The photon detector used in optical receivers is either a PIN diode or an avalanche photo diode (APD). ...

Artificial neural network (ANN) has application in communication engineering in diverse areas such as channel equalization, channel modeling, error control code because of its capability of nonlinear processing, adaptability, and parallel processing. On the other hand, wavelet transform (WT) with both the time and the frequency resolution provides the exact representation of signal in both doma...

We present a new technique of injecting clocks optically onto CMOS chips without the use of a receiver amplifier. We discuss the benefits of such a direct approach and present proof-ofprinciple experiments of the technique. We analytically compare a receiver-less optical clock distribution and an electrical clock distribution in a fan-out-of-four clock tree to evaluate the timing and power bene...