Patent US5809184A successfully refreshed from Google Patents.
US5809184A
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Polarization diversity waveguide grating receiver
Assignee: Nokia of America Corp
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Filing: 1996-10-15
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Granted: 1998-09-15
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Expires: 2016-10-15
Abstract
Abstract A waveguide grating multifrequency receiver (MFR) is described with low polarization sensitivity. Polarization insensitivity is achieved using our polarization diversity scheme in which the TM polarized signal component of the unpolarized received input signal is converted to a second TE polarized signal and both TE polarized signals are made to share a common waveguide grating router and photodetectors. The MFR may be implemented using integrated optical preamplifiers and detectors in indium phosphide (InP).
Inventors
- 👤 Christopher Richard Doerr
- 👤 Martin Zirngibl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:06
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/12007; G02B6/12009; G02B6/12016; G02B6/12019; G02B6/12023
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
149 words
A receiver comprising a polarization splitter for receiving an unpolarized multiplexed lightwave signal and splitting it into a first and second orthogonally polarized lightwave signals, polarization changing means for changing the second polarized signal to an additional first polarized signal, a bidirectional wavelength separation filter for receiving the first polarized signal at a first end and separating it into a plurality of separate wavelength channel signals for output at a second end and for receiving the additional first polarized signal at the second end and separating it into a plurality of separate wavelength channel signals for output at the first end, and a plurality of detectors, each detector detecting a different wavelength channel signal, wherein each channel in the first polarized signal impinges on one end of a corresponding detector and each channel in the additional first polarized signal impinges on a different end of the same corresponding detector.
Claim 2
Dependent Claim
149 words
A receiver comprising a polarization splitter for receiving an unpolarized multiplexed lightwave signal and splitting it into a first and second orthogonally polarized lightwave signals, polarization changing means for changing the second polarized signal to an additional first polarized signal, a bidirectional wavelength separation filter for receiving the first polarized signal at a first end and separating it into a plurality of separate wavelength channel signals for output at a second end and for receiving the additional first polarized signal at the second end and separating it into a plurality of separate wavelength channel signals for output at the first end, and a plurality of detectors, each detector detecting a different wavelength channel signal, wherein each channel in the first polarized signal impinges on one end of a corresponding detector and each channel in the additional first polarized signal impinges on a different end of the same corresponding detector.
Claim 3
Dependent Claim
17 words
The receiver of claim 1 wherein the bidirectional wavelength separation filter is a bidirectional waveguide grating router.
Claim 4
Dependent Claim
18 words
The receiver of claim 1 wherein the bidirectional wavelength separation filter is a chirped bidirectional waveguide grating router.
Claim 5
Dependent Claim
21 words
The receiver of claim 1 wherein the bidirectional wavelength separation filter and the detectors are integrated together onto a semiconductor chip.
Claim 6
Dependent Claim
14 words
The receiver of claim 4 wherein the semiconductor chip is made of Indium Phosphide.
Claim 7
Dependent Claim
28 words
The receiver of claim 1 wherein a polarization-maintaining optical fiber is used to connect the first polarized signal between the polarization splitter and the bidirectional wavelength separation filter.
Claim 8
Dependent Claim
19 words
The receiver of claim 1 wherein the first polarized signal and the additional first polarized signal are TE polarizations.
Claim 9
Dependent Claim
192 words
A receiver comprising a polarization splitter for receiving an unpolarized multiplexed lightwave signal and splitting it into a first and second orthogonally polarized lightwave signals, polarization changing means for chancing the second polarized signal to an additional first polarized signal, wherein the polarization changing means includes a polarization-maintaining optical fiber which has a 90 degree twist, whereby the second polarized signal received from the polarization splitter at a first end of the fiber is outputted to a bidirectional wavelength separation filter at a second end of the fiber as the additional first polarized signal said bidirectional wavelength separation filter for receiving the first polarized signal at a first end and separating it into a plurality of separate wavelength channel signals for output at a second end and for receiving the additional first polarized signal at the second end and separating it into a plurality of separate wavelength channel signals for output at the first end, and a plurality of detectors, each detector detecting a different wavelength channel signal, of both the plurality of first polarized signal outputted at the second end and the additional first polarized signal outputted at the first end.
Claim 10
Dependent Claim
192 words
A receiver comprising a polarization splitter for receiving an unpolarized multiplexed lightwave signal and splitting it into a first and second orthogonally polarized lightwave signals, polarization changing means for chancing the second polarized signal to an additional first polarized signal, wherein the polarization changing means includes a polarization-maintaining optical fiber which has a 90 degree twist, whereby the second polarized signal received from the polarization splitter at a first end of the fiber is outputted to a bidirectional wavelength separation filter at a second end of the fiber as the additional first polarized signal said bidirectional wavelength separation filter for receiving the first polarized signal at a first end and separating it into a plurality of separate wavelength channel signals for output at a second end and for receiving the additional first polarized signal at the second end and separating it into a plurality of separate wavelength channel signals for output at the first end, and a plurality of detectors, each detector detecting a different wavelength channel signal, of both the plurality of first polarized signal outputted at the second end and the additional first polarized signal outputted at the first end.
Claim 11
Dependent Claim
206 words
A receiver comprising a polarization splitter for receiving an unpolarized multiplexed lightwave signal and splitting it into a first and second orthogonally polarized lightwave signals, polarization changing means for changing the second polarized signal to an additional first polarized signal, a bidirectional wavelength separation filter for receiving the first polarized signal at a first end and separating it into a plurality of separate wavelength channel signals for output at a second end and for receiving the additional first polarized signal at the second end and separating it into a plurality of separate wavelength channel signals for output at the first end, a plurality of detectors, each detector detecting a different wavelength channel signal, of both the plurality of first polarized signal outputted at the second end and the additional first polarized signal outputted at the first end, a first amplifier, located between the polarization splitter and the bidirectional wavelength separation filter, for receiving, amplifying and outputting the first polarized signal to the first end of the bidirectional wavelength separation filter and a second amplifier, located between the polarization changing means and the bidirectional wavelength separation filter for receiving, amplifying and outputting the additional first polarized signal to the second end of the bidirectional wavelength separation filter.
Claim 12
Dependent Claim
206 words
A receiver comprising a polarization splitter for receiving an unpolarized multiplexed lightwave signal and splitting it into a first and second orthogonally polarized lightwave signals, polarization changing means for changing the second polarized signal to an additional first polarized signal, a bidirectional wavelength separation filter for receiving the first polarized signal at a first end and separating it into a plurality of separate wavelength channel signals for output at a second end and for receiving the additional first polarized signal at the second end and separating it into a plurality of separate wavelength channel signals for output at the first end, a plurality of detectors, each detector detecting a different wavelength channel signal, of both the plurality of first polarized signal outputted at the second end and the additional first polarized signal outputted at the first end, a first amplifier, located between the polarization splitter and the bidirectional wavelength separation filter, for receiving, amplifying and outputting the first polarized signal to the first end of the bidirectional wavelength separation filter and a second amplifier, located between the polarization changing means and the bidirectional wavelength separation filter for receiving, amplifying and outputting the additional first polarized signal to the second end of the bidirectional wavelength separation filter.
Claim 13
Dependent Claim
28 words
The receiver of claim 9 wherein the first and second amplifiers together with the bidirectional wavelength separation filter and the detectors are integrated together onto a semiconductor chip.
Claim 14
Dependent Claim
14 words
The receiver of claim 10 wherein the semiconductor chip is made of Indium Phosphide.
Claim 15
Dependent Claim
159 words
A receiver comprising a splitter for receiving an unpolarized multiplexed lightwave signal and splitting it into a first and second lightwave signals, polarization changing means for changing the second signal to an additional first signal by rotating the polarization of the second signal 90 degrees to a polarization of the first signal, a bidirectional wavelength separation filter for receiving the first signal at a first end and separating it into a plurality of separate wavelength channel signals for output at a second end and for receiving the additional first signal at the second end and separating it into a plurality of separate wavelength channel signals for output at the first end, and a plurality of detectors, each detector detecting a different wavelength channel signal wherein each channel in the first polarized signal impinges on one end of a corresponding detector and each channel in the additional first polarized signal impinges on a different end of the same corresponding detector.
Claim 16
Dependent Claim
159 words
A receiver comprising a splitter for receiving an unpolarized multiplexed lightwave signal and splitting it into a first and second lightwave signals, polarization changing means for changing the second signal to an additional first signal by rotating the polarization of the second signal 90 degrees to a polarization of the first signal, a bidirectional wavelength separation filter for receiving the first signal at a first end and separating it into a plurality of separate wavelength channel signals for output at a second end and for receiving the additional first signal at the second end and separating it into a plurality of separate wavelength channel signals for output at the first end, and a plurality of detectors, each detector detecting a different wavelength channel signal wherein each channel in the first polarized signal impinges on one end of a corresponding detector and each channel in the additional first polarized signal impinges on a different end of the same corresponding detector.
Claim 17
Dependent Claim
12 words
The receiver of claim 12 wherein the splitter is a polarization splitter.
Claim 18
Dependent Claim
11 words
The receiver of claim 12 wherein the splitter is a coupler.
References Cited (Backward Citations)
US5127066A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-14 | 2006-03-16 | 2006-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-14 | 2010-03-16 | 2010-09-15 | $7700.00 | Window Closed / Lapsed |