Abstract
Progress has been made on an integrated acoustooptic modulator needed for a proposed optical communication network. The system, which is described elsewhere,1 can employ a standing wave surface acoustic wave (SWSAW) to generate microwave subcarriers needed to multiplex analog and/or digital signals. Previous experiments demonstrated intensity modulation of a guided optical beam at a frequency of 70 MHz by a SWSAW which diffracted light in the Raman-Nath regime.1,2 Intensity modulation of an optical beam at 600 MHz has been observed recently using a Bragg version of this modulator. Superimposing NTSC VHF TV signals on the bias current of the laser diode resulted in mixing between the TV signals and the 600-MHz acoustooptic modulation. Hence, the VHF TV signals were optically upconverted into the UHF range by the acoustooptic modulator. A photodiode was used to convert the UHF signals back into an electrical form. The carrier-to-noise ratio (CNR) was at least 30 dB for the picture carriers of the upconverted TV signals. The observed picture quality was good.
© 1989 Optical Society of America
PDF ArticleMore Like This
John C. Butler, Arthur D. Fisher, John J. Kramer, and John N. Lee
ThO2 OSA Annual Meeting (FIO) 1990
Karl Kissa, X. L. Wang, Charles S. Ih, and R. G. Hunsperger
MK3 OSA Annual Meeting (FIO) 1988
C. Kuti, L. Turi, Li Yan, and Chi H. Lee
MG5 OSA Annual Meeting (FIO) 1989