Fiber Optic Glossary

• Jacket
  The protective outer coating of the cable.
• Jacket Insulation
  Insulating material around a wire or cable.
• JIT
  An abbreviation for just in time.
• Jitney
  Low cost optical link.
• Jitter
  Also called phase jitter, timing distortion, or inter-symbol interference. The slight movement of a transmission signal in time or phase...
• Jitter Data Dependent (DDJ)
  Jitter that is related to the transmitted symbol sequence. DDJ is caused by the limited bandwidth characteristics, non-ideal individual pulse responses,...
• Jitter Deterministic (DJ)
  Timing distortions caused by normal circuit effects in the transmission system. Deterministic fitter is often subdivided into duty cycle distortion (DCD)...
• Jitter Duty Cycle Distortion (DCD)
  Distortion usually caused by propagation delay differences between low-to-high and high-to-low transitions. DCD is manifested as a pulse width distortion of...
• Jitter Random (RJ)
  Jitter due to thermal noise which may be modeled as a Gaussian process. The peak-to-peak value of random jitter is of...
• Joule
  One watt per second; a measurement frequently given for laser output in pulsed operation.
• Jumper
  Fiber optic cable with the connectors on the both ends.
• Jumper Cable
  A short single fiber cable with connectors on both ends used for interconnecting other cables or testing. Jumper cables connect...
• Junction
  The intersection of three or more bundles from different directions in a harness assembly.
• Junction Laser
  A semiconductor diode laser.

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