Pulse or digital communications – Testing
Reexamination Certificate
2008-04-08
2008-04-08
Payne, David C. (Department: 2611)
Pulse or digital communications
Testing
C375S226000, C375S361000, C375S371000, C375S374000, C375S375000, C329S302000, C370S516000, C702S069000
Reexamination Certificate
active
07356077
ABSTRACT:
Apparatuses and methods for testing the integrity of high speed optical fiber transmission networks are presented. Data from an optical network, for example, NRZ formatted data at forty gigabits per second and higher may be reliably recovered using embodiments of the invention. The invention employs hybrid microwave and high speed processing technology to reliably measure the phase shift of the data transmitted over a high speed optical transmission network by comparing the incoming data to a super-stable clock/frequency reference. The clock/frequency reference is intentionally offset by fractional frequency resulting in a beat frequency when compared to the incoming data. The beat frequency provides the ability for automatic calibration of the phase measurements because the period of the full 360 degrees phase is known. Also, the invention provides reliable means for measuring jitter and for generating Eye-pattern diagrams by eliminating issues associated with oscilloscope loop bandwidth limitations. Additionally, the phase of an incoming data and the time of the phase are available from measurements using high speed samplers.
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Fala Joseph M.
Wills Luis A.
Articola Phillip J.
Dsouza Adolf
Foley & Lardner LLP
Payne David C.
Spirent Communications Inc.
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