The moving population inversion gratings formed due to spatial hole burning inside a semiconductor ring laser gyroscope causes nonlinear coupling of the counter-traveling modes. We mathematically demonstrate this phenomenon using Perturbation Theory and calculate the limit imposed by it on the sensitivity of inertial rotation.

Detecting presence of proteins in a given sample is an essential part of diagnostics. The use of the avidin–biotin interaction is becoming an increasingly common method for the detection of proteins. Among avidin group, Streptavidin forms strongest non-covalent biological interaction with biotin. Therefore, it is stable in wide range of temperatures and exhibits similar binding as antigen–antibody binding. The strong interaction has led to a large number of diagnostic applications using Streptavidin–Biotin technology. Permittivity of Biotin–Streptavidin combination shows a frequency dependency in several dispersion regions like regions. Traditional and standard biological testing use immunoassay technology (ELISA) method use chemicals, and molecules which modifies or destroy properties of sensing bio molecule are cumbersome (several reaction steps) and time consuming. We present design and development of the Bio Sensors using RF. On the other-hand, application of conventional electronic devices which are available commercially to optical signals is a current day challenge. As the output of these devices is bipolar it is difficult to apply to optical signals which are always positive or zero. Hence, developing devices with binary output is of great importance. It would be very interesting to design and develop all-optical devices using ring lasers for communication and computing applications. The design and modeling of various all-optical devices such as Gyroscope and Modulators has been proposed.

Mathematical model of nonlinear coupling and its effect on rotation sensitivity of semiconductor ring laser gyroscope

Radio frequency biosensing and all-optical devices

In this paper, we report, for the first time to our knowledge, the modeling and the design of a miniaturized integrated optical sensor, based on a multiple quantum-well (MQW) microring laser, to be used in gyroscope systems. The device can be fully integrated on a single chip and used either in low (e.g., vehicles for land transport) or high (e.g., ships, airplanes, spaceborne platforms) sensitivity navigation systems. The model includes the influence of some physical effects, such as quantum noise, lock in, thermal effect, and sidewall roughness-induced losses. Very good performance has been obtained in terms of gyro quantum limit, operating regions of detectable velocity, thermal range of operation, and power consumption. The proposed architecture shows significant manifold advantages with respect to other existing optical solutions: no polarization-induced noise, no use of frequency-locking techniques, negligible bending losses, high cavity quality factor, complete evaluation of the rotation speed, predictable thermal variation of the gyro scale factor, and very high dynamic range.

Mathematical model of nonlinear coupling and its effect on rotation sensitivity of semiconductor ring laser gyroscope

Citations

Radio frequency biosensing and all-optical devices

References

Modeling and design of a novel miniaturized integrated optical sensor for gyroscope systems

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