Efficient optical transmission system
View Patent ↗A transmitter for optical communication systems includes a source of optical radiation, a source of complex non-information signals, and a modulator unit in communication with the source of optical radiation. The modulator unit is also in communication with the source of complex non-information signals. The modulator has an input adapted to receive information-bearing signals.
1. A transmitter for optical communication systems, compnsing:
a source of optical radiation;
a source of complex non-information signals;
a modulator unit in communication with said source of optical radiation, in communication with said source of complex non-information signals, and further having an input adapted to receive information-bearing signals;
wherein an output spectrum of said transmitter comprises
baseband signals having a spectral distribution on a low end of said spectrum,
upconverted complex non-information signals having a spectral distribution on a high end of the spectrum, and
information bearing signals having a spectral distribution in a middle of said spectrum.
2. A transmitter for optical communication systems according to claim 1 , wherein
said information-bearing signals have a first spectral distribution, and said source of complex non-information signals provides a complex non-information signal having a second spectral distribution that is substantially non-overlapping with said first spectral distribution.
3. A transmitter for optical communication systems according to claim 1 , wherein said source of complex non-information signals is a pseudo-random signal generator.
4. A transmitter for optical communication systems according to claim 1 , wherein said source of complex non-information signals is a spread spectrum signal generator.
5. A transmitter for optical communication systems according to claim 1 , wherein said source of complex non-information signals is a chaotic signal generator.
6. A transmitter for optical communication systems according to claim 1 , wherein said modulator unit comprises a direct modulator and an external modulator.
7. A transmitter for optical communication systems according to claim 6 , wherein said external modulator is in communication with said input adapted to receive information-bearing signals.
8. A transmitter for optical communication systems according to claim 7 , wherein said source of complex non-information signals is in communication with said direct modulator.
9. A transmitter for optical communication systems according to claim 8 , wherein said modulator unit further comprises an upconverter in communication with said source of complex non-information signals and in communication with said direct modulator.
10. A transmitter for optical communication systems according to claim 8 , wherein said modulator unit further comprises an upconverter in communication with said source of complex non-information signals and in communication with said external modulator.
11. A transmitter for optical communication systems according to claim 6 , wherein said external modulator is a Mach-Zehnder interferometer.
12. A transmitter for optical communication systems according to claim 1 , wherein said modulator unit comprises an external modulator in communication with at least one of said source of complex non-information signals and said input adapted to receive information-bearing signals.
13. A transmitter for optical communication systems according to claim 12 , wherein said modulator unit comprises an external modulator in communication with said source of complex non-information signals and in communication with said input adapted to receive information-bearing signals.
14. A transmitter for optical communication systems according to claim 13 , wherein said modulator unit further comprises an upconverter in communication with said complex non-information signals and in communication with said external modulator.
15. A transmitter for optical communication systems according to claim 13 , wherein said modulator unit further comprises an upconverter in communication with said complex non-information signals and said external modulator.
16. A transmitter for optical communication systems according to claim 12 , wherein external modulator is in communication with said source of complex non-information signals.
17. A transmitter for optical communication systems according to claim 16 , wherein a modulator unit further comprises an upconverter in communication with said complex non-information signals and said modulator.
18. A transmitter for optical communication systems according to claim 17 , wherein said modulator unit further comprises a second modulator in communication with said input adapted to receive information-bearing signals.
19. A transmitter for optical communication systems according to claim 18 , wherein said modulator further comprises a direct modulator in communication with said complex non-information signals.
20. A transmitter for optical communication systems according to claim 19 , wherein said modulator unit further comprises a second upconverter in communication with said complex non-information signals and in communication with the first mentioned modulator.
21. A transmitter for optical communication systems according to claim 1 , wherein said source of optical radiation is a laser.
22. An optical communication system comprising:
an optical transmission line;
a transmitter in communication with said optical transmission line; and
a receiver in communication with the optical transmission line,
wherein the transmitter comprises:
a source of optical radiation;
a source of complex non-information signals; and
a modulator unit in communication with said source of optical radiation, in communication with said source of complex non-information signals, and further having an input adapted to receive information-bearing signals, wherein
an output spectrum of said transmitter comprises
baseband signals having a spectral distribution on a low end of said spectrum,
upconverted complex non-information signals having a spectral distribution on a high end of the spectrum, and
information bearing signals having a spectral distribution in a middle of said spectrum.
23. An optical communication system according to claim 22 further compnsing:
a wavelength division multiplexer in communication with said transmission line and in communication with said transmitter; and
a wavelength division demultiplexer in communication with said transmission line and in communication with said receiver.
24. An optical communication system according to claim 22 , wherein
said information-bearing signals have a first spectral distribution, and
said source of complex non-information signals provides a complex non-information signal having a second spectral distribution that is substantially non-overlapping with said first spectral distribution.
25. An optical communication system according to claim 22 , wherein said source of complex non-information signals is a pseudo-random signal generator.
26. An optical communication system according to claim 22 , wherein said source of complex non-information signals is a spread spectrum signal generator.
27. An optical communication system according to claim 22 , wherein said source of complex non-information signals is a chaotic signal generator.
28. An optical communication system according to claim 22 , wherein said source of optical radiation is a laser.
29. An optical communication system according to claim 22 , wherein said modulator unit comprises a direct modulator and an external modulator.
30. An optical communication system according to claim 29 , wherein said external modulator is a Mach-Zehnder interferometer.
31. An optical communication system according to claim 29 , wherein said external modulator is in communication with said input adapted to receive information-bearing signals.
32. An optical communication system according to claim 31 , wherein said source of complex non-information signals is in communication with said direct modulator.
33. An optical communication system according to claim 32 , wherein said modulator unit further comprises an upconverter in communication with said source of complex non-information signals and in communication with said direct modulator.
34. An optical communication system according to claim 32 , wherein said modulator unit further comprises an upconverter in communication with said source of complex non-information signals and in communication with said external modulator.
35. An optical communication system according to claim 22 , wherein said modulator unit comprises an external modulator in communication with at least one of said source of complex non-information signals and in communication with said input adapted to receive information-bearing signals.
36. An optical communication system according to claim 35 , wherein said modulator unit comprises an external modulator in communication with said source of complex non-information signals and in communication with said input adapted to receive information-bearing signals.
37. An optical communication system according to claim 36 , wherein said modulator unit further comprises an upconverter in communication with said complex non-information signals and in communication with said external modulator.
38. An optical communication system according to claim 36 , wherein said modulator unit further comprises an upconverter in communication with said complex non-information signals and in communication with said external modulator.
39. An optical communication system according to claim 35 , wherein external modulator is in communication with said source of complex non-information signals.
40. An optical communication system according to claim 35 , wherein said modulator unit further comprises an upconverter in communication with said complex non-information signals and in communication with said modulator.
41. An optical communication system according to claim 40 , wherein said modulator unit further comprises a second modulator in communication with said input adapted to receive information-bearing signals.
42. An optical communication system according to claim 41 , wherein said modulator further comprises a direct modulator in communication with said complex non-information signals.
43. An optical communication system according to claim 42 , wherein said modulator unit further comprises a second upconverter in communication with said complex non-information signals and in communication with the first mentioned modulator.
44. A method of transmitting information in an optical communication system, comprising:
generating a beam of light;
modulating said beam of light responsive to a complex non-information signal; and
modulating said beam of light responsive to an information signal, wherein
said complex non-information signal has a first signal spectrum and said information signal has a second signal spectrum, said first and second signal spectra being substantially non-overlapping in a frequency domain; and
an output spectrum of said transmitted information comprises
baseband signals having a spectral distribution on a low end of said spectrum,
upconverted complex non-information signals having a spectral distribution on a high end of the spectrum, and
information bearing signals having a spectral distribution in a middle of said spectrum.
45. A method of transmitting information in an optical communication system according to claim 44 , wherein said complex non-information signal comprises a pseudo-random signal.
46. A method of transmitting information in an optical communication system according to claim 44 , wherein said complex non-information signal comprises a spread spectrum signal.
47. A method of transmitting information in an optical communication system according to claim 44 , wherein said complex non-information signal comprises a chaotic signal.
48. A method of transmitting information in an optical communication system according to claim 44 , wherein said modulating said beam of light responsive to complex non-information signal comprises upconverting said complex non-information signal.
49. A method of transmitting information in an optical communication system according to claim 44 , wherein said modulating said beam of light responsive to complex non-information signal is direct modulation.
50. A method of transmitting information in an optical communication system according to claim 44 , wherein said modulating said beam of light responsive to complex non-information signal is external modulation.