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Patent Agency Ranking
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公开(公告)号：DE3687586T2
公开(公告)日：1993-08-19
申请号：DE3687586
申请日：1986-02-14
Applicant: IBM
Inventor： HAAS LEE CLYDE , LOEB MITCHELL LEVY
IPC: H04J1/00 , G02B6/34 , H04B10/00 , H04B10/07 , H04B10/2507 , H04J14/00 , H04J14/02 , H04L7/00 , H04B10/18
Abstract: When a byte of digital data is transmitted through a dispersive medium using frequency or wavelength division multiplexing (WDM) techniques, individual bits in the byte are normally delayed different amounts of time. This is referred to as bit skew. WDM apparatus is described along with a system for deskewing WDM data received after transit through a dispersive medium. Two bits in a given byte of data are detected. The relative times of arrival of the remaining bits in a byte are predicted using the relative delay between the two detected bits and the known frequency-related dispersion characteristics of the transmission medium. Certain bits in each received byte may be delayed using clock delay lines or registers to reduce the amount of time skew between the various bits in a byte.
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公开(公告)号：DE69025742T2
公开(公告)日：1996-09-19
申请号：DE69025742
申请日：1990-12-28
Applicant: IBM
Inventor： LOEB MITCHELL LEVY , STILWELL GEORGE RAYMON
IPC: H04J14/00 , H04B10/2507 , H04B10/2513 , H04J1/00 , H04J14/02 , H04B10/18
Abstract: The invention relates to a method and a system for deskewing data transmitted via a dispersive medium such as a fiber optic link, wherein the relative delays in arrival time for a plurality of bits, propagated in separate channels are measured. The relative delays are used to calculate the wavelength ( lambda ) of one channel and the zero dispersion wavelength ( lambda 0) of the medium. The relative delays in arrival tides for the remaining bits in a group of bits are predicted using the measured relative delays, the spacing ( delta ) between the transmitters and the calculated wavelengths. An adjustable delay for storing data bits is provided in each channel. The relative delays are used to deskew the individual bits.
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公开(公告)号：DE69025742D1
公开(公告)日：1996-04-11
申请号：DE69025742
申请日：1990-12-28
Applicant: IBM
Inventor： LOEB MITCHELL LEVY , STILWELL GEORGE RAYMON
IPC: H04J14/00 , H04B10/2507 , H04B10/2513 , H04J1/00 , H04J14/02 , H04B10/18
Abstract: The invention relates to a method and a system for deskewing data transmitted via a dispersive medium such as a fiber optic link, wherein the relative delays in arrival time for a plurality of bits, propagated in separate channels are measured. The relative delays are used to calculate the wavelength ( lambda ) of one channel and the zero dispersion wavelength ( lambda 0) of the medium. The relative delays in arrival tides for the remaining bits in a group of bits are predicted using the measured relative delays, the spacing ( delta ) between the transmitters and the calculated wavelengths. An adjustable delay for storing data bits is provided in each channel. The relative delays are used to deskew the individual bits.
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公开(公告)号：DE3687586D1
公开(公告)日：1993-03-11
申请号：DE3687586
申请日：1986-02-14
Applicant: IBM
Inventor： HAAS LEE CLYDE , LOEB MITCHELL LEVY
IPC: H04J1/00 , G02B6/34 , H04B10/00 , H04B10/07 , H04B10/2507 , H04J14/00 , H04J14/02 , H04L7/00 , H04B10/18
Abstract: When a byte of digital data is transmitted through a dispersive medium using frequency or wavelength division multiplexing (WDM) techniques, individual bits in the byte are normally delayed different amounts of time. This is referred to as bit skew. WDM apparatus is described along with a system for deskewing WDM data received after transit through a dispersive medium. Two bits in a given byte of data are detected. The relative times of arrival of the remaining bits in a byte are predicted using the relative delay between the two detected bits and the known frequency-related dispersion characteristics of the transmission medium. Certain bits in each received byte may be delayed using clock delay lines or registers to reduce the amount of time skew between the various bits in a byte.
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