Optical frequency discriminator using two mach-zehnder interfero

Details Optical frequency discriminator using two mach-zehnder interfero Optical frequency discriminator using two mach-zehnder interfero

1992-10-20

1994-10-25

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

359182, 25022719, G01B 902

Patent

active

053594126

ABSTRACT:
An optical frequency discriminator having enhanced linearity is provided, which discriminator may be utilized in FM communications systems or in other applications. The discriminator has two interferometers with the optical path length difference for the first interferometer being .DELTA.L and for the second interferometer being m.DELTA.L where m>1. The optical FM signal is applied in parallel to both optical interferometers with approximately m.sup.3 times as much of the signal being applied to the first interferometer as to the second interferometer. Each interferometer has an output signal versus frequency characteristic with a substantially linear region about a center frequency, which center frequency is approximately equal to the center frequency of the input optical signal. The outputs from the interferometers are combined in a manner such as the difference in absolute value of the linear region characteristic slopes is obtained, the resulting output being a discriminated output which is substantially linear over an enhanced FM range.

REFERENCES:
patent: 3584956 (1971-03-01), Hines
patent: 3795447 (1974-03-01), Welch et al.
patent: 4805235 (1989-02-01), Henmi
J. Stone and L. W. Stulz, "Pigtailed High-Finesse Tunable Fibre Fabry-Perot Interferometers with Large, Medium and Small Free Spectral Ranges", Electronics Letters, Jul. 16, 1987, vol. 23, No. 15.
K. T. Koai and R. Olshansky, "Simultaneous Optical Amplification, Detection, and Transmission Using In-Line Semiconductor Laser Amplifiers", May 1992, Photonics Technology Letters, vol. 4, No. 5, May 1992, pp. 441-443.
M. J. Chawki, L. Le Guiner, D. Dumay and J. C. Keromnes, "Transmission System Using FP Laser as FSK Discriminator/Photodetector", Electronics Letters, 28, 1573, Aug. 13, 1992 Semiconductor Optical Amplifier, BTD Publication No. 008.
Revision 1, Issue Date Jan. 17, 1992, pp. 1-6, G. E. Betts, K. G. Ray and C. H. Cox III, "Optical Analog Link Using an External Modulator", pp. 7, 8 and 9.

Affiliated with

Also associated with

Rating

Optical frequency discriminator using two mach-zehnder interfero does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical frequency discriminator using two mach-zehnder interfero, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical frequency discriminator using two mach-zehnder interfero will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-139146