Development of wide-band and highly sensitive electric field sensor using LiNbO3 optical modulator

A Mach-Zehnder interferometer whose half-wave voltage is about 4 V and a YAG laser pumped by a laser diode whose output power is 25 mW are used to improve the sensitivity of a LiNbO/sub 3/ electromagnetic field sensor. The resulting frequency response is almost flat from 100 Hz to 300 MHz and the minimum detectable electric field strength is 1 mV/m at 50 MHz and 0.14 mV/m at 750 MHz. The frequency response of the sensor is analyzed using the moment method, and the calculated results agree with the measured results. The improved sensor can measure an electromagnetic impulse whose peak value is larger than 10 V/m and width is wider than 5 ns.1991 IEEE International Symposium on Electromagnetic Compatibility, 12 July-16 August, 1991, Cherry Hill, NJ, US

Calculation of service area for mobile communication system using optical rays

Communication systems using optical rays are expected to be used in environments containing sensitive electronic equipment. This paper studies a method of calculating the service area for an optical mobile communication system. The service area is defined by the communication angle, which is calculated using ray-tracing theory considering reflections from materials in the room. The calculated results are compared with experimentally measured ones, and the difference is less than 12%.1999 International Symposium on Electromagnetic Compatibility, May 17-21, 1999, Surugadai Memorial Hall, Chuo University, Tokyo, Japa

Highly Sensitive Electric Field Sensor Using LiNbO_3 Optical Modulator

This letter describes a highly sensitive broad-band electric field sensor that uses a LiNbO3 optical modulator. A broad-band, low driving-power optical modulator and high-power optical source are used to achieve high sensitivity. The minimum detection level of 1 mV /m and band-width of 1 GHz are obtained

High sensitivity electric field sensor using Mach-Zehnder interferometer

1994 International Symposium on Electromagnetic Compatibility (EMC\u2794/Sendai), May 16 - 20, 1994, Hotel Sendai Plaza, Miyagi, Japa

Development and Analysis of Electric Field Sensor Using LiNbO3 Optical Modulator

The sensitivity of an electromagnetic field sensor which uses a LiNbO3 electrooptical crystal and an optical-fiber link is improved by using a Mach-Zehnder interferometer, whose half-wave voltage is about 4 V at 1.3- mu m wavelength, and a YAG laser pumped by a laser diode whose output power is 25 mW. The resulting frequency response is about flat from 100 Hz to 300 MHz, and the minimum detectable electric field strengths are 0.22 mV/m at 50 MHz and 0.079 mV/m at 750 MHz. The variation of the sensitivity with the frequency and element length are analyzed using the moment method, and the calculated results agree with the measured results. The measurement of the cross-polarization of the sensor indicates that this property is similar to that of a dipole antenna. The improved sensor can measure an electromagnetic impulse whose peak value is larger than 10 V/m and whose width is wider than 5 ns