US5355243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct detecting of optical PSK signals
Assignee: Ciena Luxembourg SARL
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Filing: 1992-08-11
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Granted: 1994-10-11
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Expires: 2012-08-11
Abstract
Abstract A self homodyne direct detection optical transmission system includes a transmitter in which binary data signals are converted into double differential phase shift keyed (DDPSK) optical signals. The receiver includes a two-path optical interferometer, having a path unbalance optical delay substantially equal to 1 bit period, to which received DDPSK signals are applied. The interferometer output is converted into a plurality of balanced phase diversity outputs. From each of the phase diversity outputs a replica of the binary data signals is recovered and the replica signals are combined to form an output binary data signal.
Inventors
- 👤 Jonathan P. King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:52
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/61; H04B10/67; H04B10/676; H04B10/677; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/223
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A self homodyne direct detection optical transmission system including at a transmitter means for converting binary data signals into double differentiated phase shift keyed optical signals, and at a receiver a 2×2 optical coupler to one input of which are applied the received double differentiated phase shift keyed optical signals, a 3×3 optical coupler two inputs of which are coupled to respective outputs of the 2×2 coupler to form a two-path optical interferometer, one of the paths including an optical delay substantially equal to 1 bit period, whereby the output of the 3×3 coupler forms 3 balanced phase diversity signals, separate means for recovering from each of the phase diversity signals a replica of the binary data signals, and means for combining the replica signals to form an output binary data signal.
Claim 2
Dependent Claim
132 words
A self homodyne direct detection optical transmission system including at a transmitter means for converting binary data signals into double differentiated phase shift keyed optical signals, and at a receiver a 2×2 optical coupler to one input of which are applied the received double differentiated phase shift keyed optical signals, a 3×3 optical coupler two inputs of which are coupled to respective outputs of the 2×2 coupler to form a two-path optical interferometer, one of the paths including an optical delay substantially equal to 1 bit period, whereby the output of the 3×3 coupler forms 3 balanced phase diversity signals, separate means for recovering from each of the phase diversity signals a replica of the binary data signals, and means for combining the replica signals to form an output binary data signal.
References Cited (Backward Citations)
US5181136A
Cited
US5148128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-10 | 1998-04-11 | 1998-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-10 | 2002-04-11 | 2002-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-10 | 2006-04-11 | 2006-10-11 | $7700.00 | Window Closed / Lapsed |