Multiple wavelength transceiver

• US 5,910,851 A
• Filed: 02/04/1997
• Issued: 06/08/1999
• Est. Priority Date: 02/04/1997
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Digital Equipment Corporation (HP Inc.)
• Inventors: Flaherty, Paul A.
• Primary Examiner(s): NEGASH, KINFE MICHAEL
• Application Number:
  US08/794,510
• Time in Patent Office: 854 Days
• Field of Search: 359/110, 359/118, 359/124, 359/143, 359/152, 359/172, 359/157, 359/164, 370/344
• US Class Current: 398/36
• CPC Class Codes: H04B 10/1149 Arrangements for indoor wireless networking of information
• CPC Class Codes: H04B 10/40 Transceivers

Abstract

A communication system includes a plurality of detectors, each detector capable of detecting an electromagnetic wave of a respective different wavelength, a transmitter, the transmitter capable of generating an electromagnetic wave of one of the respective different wavelengths, and a collision detector coupled to the plurality of detectors and the transmitter, the collision detector determining when the energy level of one of the plurality of detectors exceeds a threshold value while the transmitter transmits the electromagnetic wave.

Claims

1. Apparatus for communication comprising:

a plurality of detectors, each detector capable of detecting an electromagnetic wave of a respective different wavelength;

a transmitter, the transmitter capable of generating an electromagnetic wave of one of the respective different wavelengths; and

a collision detector coupled to the plurality of detectors and the transmitter, the collision detector determining when the energy level of one of the plurality of detectors exceeds a threshold value while the transmitter transmits the electromagnetic wave.

2. The apparatus of claim 1 wherein the one of the plurality of detectors detects a different wavelength than the electromagnetic wave generated by the transmitter.

3. The apparatus of claim 1 further comprising:

a plurality of transmitters, each transmitter capable of generating an electromagnetic wave of a respective different wavelength, the set of wavelengths generated by the plurality of transmitters being equal to the set of wavelengths detected by the plurality of detectors.

4. The apparatus of claim 1 where the first and second wavelengths are in the infrared portion of the electromagnetic spectrum.

5. The apparatus of claim 1 further comprising a plurality of low pass filters coupled between the respective detectors and the collision detector.

6. The apparatus of claim 5 wherein the respective detectors are also coupled directly to the collision detector.

7. The apparatus of claim 5 wherein the plurality of low pass filters record and average the signal strengths detected by respective detectors.

8. The apparatus of claim 1 where the collision detector provides a binary data output and a collision indication signal.