Masahide Miyachi

Frequency control techniques in coherent multichannel LAN's

This paper describes frequency control techniques for cold start and channel recognition functions in coherent multichannel local area networks. A Z-cut quartz etalon can be used to stabilize the optical transmitter frequencies. The capture range and the influence of humidity on a Fabry-Perot etalon are discussed. The frequency deviation of the optical transmitter was estimated to be less than /spl plusmn/1 GHz in the long term. A double AFC loop has been proposed for local LD frequency control. It showed a wide capture range of /spl plusmn/100 GHz. Coherent FDM receiver switching to the desired channel was demonstrated over a range from 0 to 40/spl deg/C in an experiment. >

Analysis of Z-cut quartz etalon for wavelength stabilization

This paper presents an analysis of the cavity length modulation of a Z-cut quartz etalon for laser diode wavelength stabilization. The electrooptic effect, piezoelectric effect, photoelastic effect, and a mechanical circuit of the etalon were considered. Approximate equations that allow clear physical interpretation of the mechanical force, mechanical resonance frequency, and Q factor of the mechanical resonance were obtained. We also compared analysis and experimental results, and show that most of the experimental values were in accord with the calculated values.

Analysis of Z-Cut Quartz Etalon with Weight for Wavelength Locker

This paper presents an analysis of the cavity length modulation of a Z-cut quartz etalon equipped with a weight for Laser Diode (LD) wavelength lockers. The electro-optic effect, piezoelectric effect and photo-elastic effect are considered, and the mechanical movement of the etalon with a weight is analyzed by using a mechanical circuit. Approximate equations that clearly explain the mechanical force, mechanical resonance frequency, and Q factor of the mechanical resonance are obtained. The mechanism for improving the modulation efficiency by placing a weight is clarified. We also compare the analysis with experimental results, and show that most of the experimental values are in accord with the calculated values.