Claims
- 1. A high speed optical receiver for receiving a substantially diminished optical signal comprising:an optical amplifier for amplifying said diminished optical signal at least several db, an ultra narrow-band filter for filtering noise generated in said optical amplifier to produce a filtered amplified optical signal, said ultra narrow-band filter being an atomic line filter, and a fast response photo detector for detecting said filtered amplified optical signal.
- 2. An optical receiver as in claim 1 wherein said optical amplifier is a semiconductor optical amplifier.
- 3. An optical receiver as in claim 2 wherein said semiconductor amplifier is a tapered stripe semiconductor amplifier.
- 4. An optical receiver as in claim 1 wherein said atomic line filter is a Faraday filter.
- 5. An optical receiver as in claim 1 and further comprising a background filter positioned ahead of said optical amplifier for filtering background light.
- 6. An optical receiver as in claim 4 and further comprising a background filter positioned ahead of said optical amplifier for filtering background light wherein said background filter is a Faraday filter.
- 7. An optical receiver as in claim 1 wherein said fast photo detector is a photodiode.
- 8. An optical receiver as in claim 7 wherein said fast photo detector is a p-i-n photo diode.
- 9. A high speed optical receiver for receiving a substantially diminished optical signal comprising:a semiconductor optical amplifier for amplifying said diminished optical signal at least several db, a Faraday filter for filtering noise generated in said optical amplifier to produce a filtered amplified optical signal and a fast response photo diode for detecting said filtered amplified optical signal.
- 10. An optical communication system comprising:A) a high speed optical receiver for receiving a substantially diminished optical signal comprising: 1) a semiconductor optical amplifier for amplifying said diminished optical signal at least several db, 2) a Faraday filter defining a passband for filtering noise generated in said optical amplifier to produce a filtered amplified optical signal and 3) a fast response photo diode for detecting said filtered amplified optical signal; and B) a high speed optical transmitter for transmitting optical signals on a light beam to said receiver comprising: 1) a light source for producing light beam at a wavelength matched to the passband of said Faraday filter, 2) an optical modulator for modulating said light beam to impose said optical signals on said beam.
- 11. An optical communication system as in claim 10 wherein said system is a free space system and said receiver further comprises a background optical filter for filtering said light beam.
- 12. An optical communication system as in claim 11 wherein said background optical filter is a Faraday filter.
- 13. An optical communication system as in claim 10 wherein said light source is a diode laser.
Parent Case Info
This is a Continuation-In Part of Ser. No. 08/221,527, now U.S. Pat. No. 5,754,323 Point to Point Laser Communication Device, filed Apr. 1, 1994 and Ser. No. 08/667,400, now U.S. Pat. No. 5,801,866 Laser Communication Device, filed Jun. 21, 1996.
US Referenced Citations (4)
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
08/221527 |
Apr 1994 |
US |
Child |
08/921812 |
|
US |
Parent |
08/667400 |
Jun 1996 |
US |
Child |
08/221527 |
|
US |