Optical transmitter data compression system

• US 6,075,251 A
• Filed: 05/14/1999
• Issued: 06/13/2000
• Est. Priority Date: 11/25/1996
• Status: Expired due to Fees

• Current Assignee: Alan Y. Chow
• Original Assignee: Alan Y. Chow
• Inventors: Chow, Alan Y., Chow, Vincent Y.
• Primary Examiner(s): LE, QUE TAN
• Application Number:
  US09/312,145
• Time in Patent Office: 396 Days
• Field of Search: 250/551, 250/214 LS, 250/208.1, 250/214.1, 250/214 R, 359/152, 359/154, 359/149, 348/222, 348/294, 348/311
• US Class Current: 250/551
• CPC Class Codes: H01L 31/08 in which radiation controls flow of current through the device, e.g. photoresistors
• CPC Class Codes: H04B 10/032 using working and protection systems H04J14/0287 takes precedence
• CPC Class Codes: H04N 25/46 by combining or binning pixels
• CPC Class Codes: H04N 25/76 Addressed sensors, e.g. MOS or CMOS sensors
• CPC Class Codes: H04N 25/772 comprising A/D, V/T, V/F, I/T or I/F converters
• CPC Class Codes: H04N 3/1506 with addressing of the image-sensor elements H04N3/1575 takes precedence
• CPC Class Codes: H04N 3/1512 for MOS image-sensors, e.g. MOS-CCD H04N3/1581 takes precedence
• CPC Class Codes: H04N 3/155 Control of the image-sensor operation, e.g. image processing within the image-sensor

Abstract

The present invention relates to a transmission method and device for efficient compression of digital data. The invention uses an optoelectronic coupler to receive light signals from a light transmitter at two bandwidths. A modulated signal generator is coupled to the transmitter which coverts voltage phase data signals to light signals. The data signals are modulated with a plurality of master profiles and subprofiles with different cycle time variations. The optoelectronic coupler has a pair of photodiodes. Light filters disposed on both diodes allow either the first or second bandwidth of light to pass. Conductors electrically couple the anode of the each photodiode to the cathode of the other photodiode which produce the voltage phase signal. A signal receiver is connected to the coupler and decodes the voltage-phase signal.

Claims

1. An optoelectronic signal receiver for receiving light transmitter signals having first and second light signals comprising:

a switch receiver having at least one pair of first and second photo detectors;

a first conductor electrically connecting the anode of the first photo detector to the cathode of the second photo detector;

a second conductor electrically connecting the cathode of the first photo detector to the anode of the second photo detector;

a first light filter disposed in front of the photoactive surface of the first photo detector that allows a first light signal to pass;

a second light filter disposed in front of the photoactive surface of the second photo detector that allows a second light signal to pass, whereby light transmitter signals having first and second light signals are converted by the first and second photo detectors into voltage-phase signals across the first and second conductors; and

a signal receiver for receiving and decoding the voltage-phase signal from the switch receiver.

2. The signal receiver of claim 1 wherein the first and second photo detectors comprises photo diodes.

3. The signal receiver of claim 1 wherein the first light filter is a first polarizer and the second light filter is a second polarizer.

4. The signal receiver of claim 1 wherein the first light filter allows light at a first band width to pass and the second light filter allows light at a second band width to pass.

5. The signal receiver of claim 1 further comprising a fiber optic cable in contact between a signal transmitter and the switch receiver.

6. An optoelectronic signal transmitter comprising:

a light transmitter operative for generating first and second light signals;

a data signal source generating a data signal; and

a modulated signal generator coupled to the transmitter and the data signal source, the modulated signal generator generating a bi-phasic signal using the first and second light signals as carrier signals to modulate the data signal.

7. The optoelectronic signal transmitter of claim 6 wherein the light transmitter comprises light emitting diodes.

8. The optoelectronic signal transmitter of claim 6 wherein the light transmitter comprises infra red light emitters.

9. The optoelectronic transmitter of claim 6 wherein the light transmitter comprises at least one laser.

10. The optoelectronic transmitter of claim 6 wherein the data signals are modulated with a plurality of master profiles and subprofiles with different cycle time variations.

11. The optoelectronic coupler of claim 10 wherein the modulated signal generator further includes:

a digital input source generating digital data;

a signal processing circuit coupled to the digital input source and which encodes the received digital data;

a memory storing the master waveform profiles coupled to the signal processing circuit;

a variable clock coupled to the signal processing circuit;

a waveform generator coupled to the signal processing circuit, the variable clock and the memory, wherein the waveform generator generates an electrical signal using a selected master waveform at a clock rate set by the variable clock, the electrical signal driving the light transmitter.

12. The optoelectronic transmitter of claim 10 wherein the data signal is modulated using a first master profile with a 25% positive voltage duty cycle, a second master profile with a 50% positive voltage duty cycle, and a third master profile with a 75% positive voltage duty cycle, and wherein the first, second and third master profiles have nine subprofiles which vary the corresponding profile by one quarter period increments.

13. The optoelectronic transmitter of claim 12 wherein the data in the data signal is transmitted as 4 bit nibbles having one of 16 potential digital sequences and 16 of the subprofiles of the first, second and third master profiles each encode one of the 16 potential digital sequences for the 4 bit nibble.

14. The optoelectronic transmitter of claim 13 wherein the remaining subprofiles of the first, second and third master profiles encode a single 0 data code, a single 1 data code, a single space data code and a multiplier factor.

15. The optoelectronic transmitter of claim 14 wherein the multiplier factor is used to compress identical and continuous sequences of 4 bit nibbles.

16. An optoelectronic data transmission and receiving system comprising:

a light transmitter operative for generating first and second light signals;

a switch receiver having at least one pair of first and second photo detectors;

a first conductor electrically connecting the anode of the first photo detector to the cathode of the second photo detector;

second conductor electrically connecting the cathode of the first photo detector to the anode of the second photo detector;

a first light filter disposed in front of the photoactive surface of the first photo detector that allows the first light signal to pass;

a second light filter disposed in front of the photoactive surface of the second photo detector that allows the second light signal to pass, whereby the first and second light signals are converted into voltage-phase signals across the first and second conductors; and

a modulated signal generator which outputs data signals to the light transmitter for transmission to the photo detectors, the modulated signal generator generating a bi-phasic signal using the first and second light signals as carrier signals to modulate the data signal.

17. The optoelectronic system of claim 16 further comprising a signal receiver which receives and decodes the voltage-phase signal from the switch receiver.

18. The optoelectronic system of claim 16 wherein the light transmitter comprises light emitting diodes.

19. The optoelectronic system of claim 16 wherein the light transmitter comprises infra red light emitters.

20. The optoelectronic system of claim 16 wherein the light transmitter comprises at least one laser.

21. The optoelectronic system of claim 16 wherein the first light filter is a first polarizer and the second light filter is a second polarizer.

22. The optoelectronic system of claim 16 wherein the first light filter allows light at a first bandwidth to pass and the second light filter allows light at a second bandwidth to pass.

23. The optoelectronic system of claim 16 wherein the first and second photo detectors are photo diodes.

24. The optoelectronic system of claim 16 wherein the data signal is modulated using a plurality of master profiles and subprofiles with different cycle time variations.

25. The optoelectronic system of claim 24 wherein the data signal is modulated using a first master profile with a 25% positive voltage duty cycle, a second master profile with a 50% positive voltage duty cycle, and a third master profile with a 75% positive voltage duty cycle, and wherein the first, second and third master profiles have nine subprofiles which vary the corresponding profile by one quarter period increments.

26. The optoelectronic system of claim 25 wherein the data in the data signal is transmitted as 4 bit nibbles having one of 16 potential digital sequences and 16 of the subprofiles of the first, second and third master profiles each encode one of the 16 potential digital sequences for the 4 bit nibble.

27. A method of transmitting and receiving digital data using a light transmitter generating a first and second light signal, the method comprising the steps of:

modulating data signals with a bi-phasic signal;

generating first and second light signals representative of the data signals;

receiving the light signals by a switch receiver having at least one pair of first and second photo detectors;

a first conductor electrically connecting the anode of the first photo detector to the cathode of the second photo detector;

a second conductor electrically connecting the cathode of the first photo detector to the anode of the second photo detector;

a first light filter disposed in front of the photoactive surface of the first photo detector that allows the first light signal;

a second light filter disposed in front of the photoactive surface of the second photo detector that allows the second light signal to pass;

converting the light signals into voltage-phase signals across the first and second conductors; and

receiving and decoding the voltage-phase signal from the said optoelectronic coupler'"'"'s switch receiver.

28. The method of claim 27 wherein the step of generating light signals further comprises filtering the first light signal at a first bandwidth and filtering the second light signal at a second bandwidth.

29. The method of claim 27 wherein the step of generating light signals includes filtering a light signal using a first polarizer and filtering the light signal using a second polarizer.

30. The method of claim 27 wherein the step of modulating the signal further comprises using a plurality of master profiles and subprofiles with different cycle time variations.

31. The method of claim 30 further comprising the steps of:

modulating the data signal using a first master profile with a 25% positive voltage duty cycle, a second master profile with a 50% positive voltage duty cycle, and a third master profile with a 75% positive voltage duty cycle, and wherein the first, second and third master profiles have nine subprofiles which vary the corresponding profile by one quarter period increments.

32. The method of claim 31 further comprising the steps of:

transmitting the data in the data signal as 4 bit nibbles having 16 potential digital sequences;

encoding one of 16 of the subprofiles of the first, second and third master profiles representing each of the 16 potential digital sequences to represent the digital sequence for the 4 bit nibble.

33. The method of claim 32 further comprising the steps of:

encoding one of the remaining subprofiles of the first, second and third master profiles as a single 0;

encoding one of the remaining subprofiles of the first, second and third master profiles as a single 1; and

encoding one of the remaining subprofiles of the first, second and third master profiles as a multiplier value.

34. The optoelectronic coupler of claim 33 further comprising the steps of:

identifying identical and continuous sequences of 4 bit nibbles;

selecting a multiplier value; and

sending the identified identical and continuous nibble as a single nibble and the selected multiplier value.