Title:
ALL-OPTICAL BALANCED DETECTION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2010/033654
Kind Code:
A3
Abstract:
A two-gate sampling system has been designed to perform sampled balanced detection of one or more input signal pairs. The present invention performs simultaneous sampling of both signals in each signal pair followed by digitization and combination of the sample pairs using software. By first sampling the signals and then combining the sampled into the corresponding balanced detected signal it is possible to avoid the bandwidth limitations and impedance problems introduced by traditional balanced detectors and electrical oscilloscopes. In particular, for optical sampling gates very high bandwidth sampling gates can be designed without any impedance issues and hence almost perfect balanced detection reconstruction can be performed for very high speed signals. Balanced detection is becoming more and more important as the new phase modulated optical data signals are introduced to the market, such as e.g. PSK, DPSK, QPSK and DQPSK. The present invention is well suited for analysis of these new types of signals.
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Inventors:
WESTLUND MATHIAS (SE)
ANDREKSON PETER (US)
SUNNERUD HENRIK (SE)
SKOLD MATS (SE)
ANDREKSON PETER (US)
SUNNERUD HENRIK (SE)
SKOLD MATS (SE)
Application Number:
PCT/US2009/057236
Publication Date:
June 03, 2010
Filing Date:
September 17, 2009
Export Citation:
Assignee:
EXFO ELECTRO OPTICAL ENG INC (CA)
WESTLUND MATHIAS (SE)
ANDREKSON PETER (US)
SUNNERUD HENRIK (SE)
SKOLD MATS (SE)
WESTLUND MATHIAS (SE)
ANDREKSON PETER (US)
SUNNERUD HENRIK (SE)
SKOLD MATS (SE)
International Classes:
H04B10/12; H04B10/00; H04B10/02
Foreign References:
| US20070188363A1 | 2007-08-16 | |||
| US20050185255A1 | 2005-08-25 | |||
| EP0250683A1 | 1988-01-07 | |||
| EP0244053A2 | 1987-11-04 |
Other References:
See also references of EP 2351263A4
Attorney, Agent or Firm:
KOBA, Wendy, W. (Springtown, PA, US)
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