Abstract: A system and method for providing two-way optical communications between a first location and at least one secondary location, wherein there is no light source available at the secondary location. In the system and method, the first location and the secondary locations are optically coupled by an optical fiber network. A laser light source is located at the first location and produces a first light signal that is transmitted to the secondary locations over the optical fiber network. At the secondary locations a portion of the first light signal is altered by selectively modulating the signal frequency. As a result, a second light signal is produced without the need of a second light source. The second light signal is then sent back to the first location over the optical fiber network where it can be isolated and interpreted as a data transmission.

Abstract: A circuit arrangement for multiplying the repetition rate of an input signal by digital techniques is disclosed. A digital counter driven by a high speed clock generates a count proportional to the input period. This count or a different count generated by translating the input count is stored repetitively at the end of each input period. A second counter is used to count the same reference pulses and produce an output pulse when its count equals the stored count.Alternatively, one of the counters can be reset to a non-zero value at the end of each of its operation cycles, thus allowing a match to be reached in an appropriate output period.