초록 ▼

The present invention relates to a lightwave communication system, and associated transmitters (13) and receivers (14), which uses both spread spectrum, code-division-multiple-access (SS-CDMA), and wavelength-division-multiplexing (WDM) techniques for 2-way transmissions over a lightwave waveguide a

The present invention relates to a lightwave communication system, and associated transmitters (13) and receivers (14), which uses both spread spectrum, code-division-multiple-access (SS-CDMA), and wavelength-division-multiplexing (WDM) techniques for 2-way transmissions over a lightwave waveguide arrangement (11) to use the overall spectrum of the waveguide arrangement (11) while providing sufficient interference rejection of randomly spaced carriers, and associated signals, which may drift into the bandwidth of transmissions of other transmitter/receiver pairs due to instabilities in carrier laser sources (20). Techniques are also disclosed for a transceiver (10i) acquiring a 2-way link with another transceiver (10j), while other transmitter/receiver pairs are concurrently communicating using WDM, SS-CDMA, signal transmissions. For example, a calling transceiver transmits a narrowband information message (40) on a random carrier which is detected by a called transceiver by scanning the frequency spectrum. The called transceiver then returns a narrowband answer signal (41) on another random carrier which is detected by the calling transceiver. In this manner, each transceiver locks onto the carrier of the other transceiver and the appropriate pseudo-noise (PN) code sequence can then be determined and synchronized before WDM, SS-CDMA, 2-way transmissions begin.

대표청구항 ▼

An optical transmitter comprising: an input terminal receiving either one of an analog or digital signal from a user associated with the optical transmitter; an output terminal for connection to a lightwave waveguide arrangement of an optical communication system; a single frequency laser source (20

An optical transmitter comprising: an input terminal receiving either one of an analog or digital signal from a user associated with the optical transmitter; an output terminal for connection to a lightwave waveguide arrangement of an optical communication system; a single frequency laser source (20) for generating a lightwave carrier signal at an undetermined wavelength; means (21) for modulating the lightwave carrier signal from the laser source with the analog or digital signal received at the input terminal to generate a lightwave signal with a narrowband optical spectrum; and means (22, 23) for spreading the optical spectrum of a lightwave signal using a predetermined, reiterative encoding sequence such that a lightwave output signal at the output terminal of the optical transmitter has an optical spectrum which is wider than the spectrum that the lightwave signal would have in the absence of the spreading means.