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Optical Link Card Functional Tester Upgrade

IP.com Disclosure Number: IPCOM000103844D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Block, TR: AUTHOR [+4]

Abstract

A new tester card and optical fiber network allows an Optical Link Card (OLC) to be tested in two modes. The first mode allows the transmit signal of the OLC to be wrapped back into the same OLC. This allows a speedy test as long as the card in functional. In the second mode, a known-good OLC transmitter or receiver is connected to the new OLC to verify which part of the new OLC is not working.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Optical Link Card Functional Tester Upgrade

      A new tester card and optical fiber network allows an Optical
Link Card (OLC) to be tested in two modes.  The first mode allows the
transmit signal of the OLC to be wrapped back into the same OLC.
This allows a speedy test as long as the card in functional.  In the
second mode, a known-good OLC transmitter or receiver is connected to
the new OLC to verify which part of the new OLC is not working.

      A block diagram of the new optical fiber network and the
modified part of the test card is shown in the figure.  The Device
Under Test (DUT) is the OLC being tested.  The Known Good (KG) card
is an OLC known to be good.  The input pattern is the source of test
data sent to the DUT.  The error detector receives the returning data
from the DUT and compares them to the data sent, detecting errors.
SW1 and SW2 are optical switches that can be set to allow optical
signals to flow between ports C and 1 or between ports C and 2.  1L
and 2L are the lasers on the DUT and KG.  1D and 2D are the detectors
on the DUT and KG.  1T and 2T are where the transmit data from the
pattern generator comes into the DUT and KG.  1R and 2R are where the
receive data comes from the DUT and KG into the error detector.  The
optical attenuator (ATT) reduces the optical power from the laser
(1L) so that the optical power received at the detector (1D) is at
the minimum power level for the detector to work.  The optical power
meter (OPM) is for setting the power of the laser on the DUT.  SP1 is
an optical splitter which splits the optical data between...