Abstract

There is great need for an all-service communication system by which broadband analog and high speed digital information can be transmitted simultaneously and freely. Such a system can best be implemented with frequency-division-multiplexing (FDM). The effective bandwidth of such a system is in the multigigahertz range. Because of the enormous bandwidth, the optical fiber communication (OFC) system is a good candidate for such applications. However, because of the serious intermodulation problems, it is still difficult to provide such services using OFC. A novel method, now known as double-beam-modulation (DBM) was suggested and demonstrated using a standingwave acoustooptic modulator (SWAOM) to 216 MHz. The DBM can be implemented in many forms.¹ We describe the experiments of DBM using SWAOM for frequencies beyond 1 GHz. Theoretical analyses and comparisons of DBM with conventional FDM systems are described.

© 1988 Optical Society of America