Showing papers by "Robert A. Minasian published in 1994"

A solution to the synthesis problem of recirculating optical delay line filters

Abstract: We present a theoretical framework for the design of optical infinite impulse response filters using fiber devices. A condition for the congruence of these structures is given in addition to a general signal processing form. The letter is concluded with a demonstrative example. >

Tunable erbium-doped fiber laser with a reflection Mach-Zehnder interferometer

Abstract: The concept of a tunable erbium-doped fiber ring laser based on a reflection Mach-Zehnder interferometer is presented. The principle of operation is demonstrated with a fiber version of the interferometer which gave a tuning range of 39 nm. With current electro-optic devices, high speed tuning should be possible. >

Ultra-low-noise and wideband-tuned optical receiver synthesis and design

Abstract: A new general optical receiver design method based on the synthesis of optimum noise-matching networks is presented. It is based on the noise figure concept in conjunction with broadband matching theory. The design is accurate because it directly utilizes the active device noise parameters, such as minimum noise figure, noise resistance, and optimum source impedance, which are readily available at microwave frequencies. The analysis has established the general noise-matching requirements of the tuning network that result in the minimum obtainable equivalent input noise current and the fundamental noise limit in tuned receivers. Synthesis procedures are described that can closely satisfy the general noise-matching requirements, which has led to a new low pass filter-type matching network with ultra-broadband characteristics that also approach the fundamental noise limit. The design principles are verified, with an experimental 10 Gb/s PIN-HEMT optical receiver that demonstrates a bandwidth of 6.3 GHz with a gain flatness of /spl plusmn/0.8 dB over the entire frequency range and a measured average noise current of 5 pA//spl radic/(Hz). >

Synthesis of lossy noise matching network for flat-gain and low-noise tuned optical receiver design

Abstract: A systematic synthesis method for lossy noise matching networks for ultra-low noise and flat-gain optical receivers is presented. The procedure utilises a topology from lossless matching network synthesis to obtain low noise, and introduces lossy network elements in the design to constrain the ripple variation of the gain to a specified value. An experimental tuned PIN-HEMT optical receiver with a gain flatness of /spl plusmn/0.8 dB over the entire frequency range and a measured average noise current of 5.04 pA//spl radic/(Hz) is demonstrated. >

A noise matching network

Abstract: A noise matching network for an optical receiver, comprising a T-network having an inductive element (3) in the series arm or arms, and a capacitive element (8) in the shunt arm or arms, wherein the network also comprises a resistive element (9) in at least one of the arms.

Low-noise optical receiver network synthesis using general noise figure concepts

Abstract: A new, accurate noise analysis method for optical receivers is presented. It is based on the noise figure concept of two-port networks and utilises directly available device noise parameters. The general noise matching network requirements are obtained for minimum receiver noise current. A synthesis procedure for low-noise broadband optical receivers is described which can closely satisfy the matching network requirements. Experimental results are presented for a band pass tuned PIN-HEMT optical receiver with a measured transimpedance gain of 46 dBΩ with a variation of less that ± 0.8 dB and a measured average noise current of 4.9 pA/√Hz over the frequency range from 1.7 GHz to 6 GHz