Browse Prior Art Database

Fiber-Optic Link Budget Tool

IP.com Disclosure Number: IPCOM000100838D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Boerstler, DW: AUTHOR [+2]

Abstract

Disclosed is a technique for statistically analyzing a fiber-optic link budget which gives an accurate representation of link performance but does not require sophisticated Monte-Carlo simulation techniques.

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This is the abbreviated version, containing approximately 65% of the total text.

Fiber-Optic Link Budget Tool

       Disclosed is a technique for statistically analyzing a
fiber-optic link budget which gives an accurate representation of
link performance but does not require sophisticated Monte-Carlo
simulation techniques.

      The fiber-optic link is characterized by four categories:
TRANSMITTER, RECEIVER, CABLE PLANT, and MARGIN. Each category
consists of the following components:
      TRANSMITTER:  Transmitter power output, fiber coupling
variation, and end-of-life degradation.
      RECEIVER:  Receiver sensitivity, fiber coupling variation,
retiming penalty, data dependence, and bit-error-rate extrapolation.
      CABLE PLANT:  Attenuation of link (cable, connectors, and
splices) and dispersion penalty.
      MARGIN:  The excess power available to the link which is not
consumed by the cable plant.

      A traditional statistical analysis is performed on the group of
components within the TRANSMITTER and RECEIVER categories to
establish Gaussian Approximations for the TRANSMITTER and the
RECEIVER, with a mean value and a standard deviation identified for
each.

      Since the margin is the difference between the transmitter and
the sum of the receiver and the cable plant, the following
inequalities hold:

                            (Image Omitted)

      Um - n Sm > 0
      Sc2 < 1/n2 ((Ut - Ur - Uc)2 - n2 (St2 + Sr2)) where
      n = number of standard deviations ...