4. Light propagation is a function of Attenuation, dispersion and
non-linearities.
∂A i 1 ∂2A 2
i + αA − β 2 +γ A A= 0
∂z 2 2 dT 2
Attenuation, Dispersion,
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NOT FOR USE OUTSIDE OF VERIZON AND JDSU Use the phrase: Moves, adds, changes Close slide with “connectors are everywhere”
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NOT FOR USE OUTSIDE OF VERIZON AND JDSU Optical return loss is the ratio of the output power of the light source to the total amount of back-reflected power (reflections and scattering). It is defined as a positive quantity. Reflectance (dB) is the ratio of reflected power to incident power due to a single interface . It is defined as a negative quantity
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NOT FOR USE OUTSIDE OF VERIZON AND JDSU - What is fiber characterization? A series of tests to perform network base-lining on a fiber network. Fiber characterization mainly consists of the 5 following tests: - Optical Insertion Loss - Optical Return Loss - Optical Time Domain Reflectometry traces - Chromatic Dispersion testing - Polarized Mode Dispersion testing
NOT FOR USE OUTSIDE OF VERIZON AND JDSU The good news after testing CD is that you can stabilize the effects by applying CD compensators throughout the network.
NOT FOR USE OUTSIDE OF VERIZON AND JDSU Different polarization states can have different group velocities within a fiber. Signal energy at a given wavelength is resolved into two orthogonal polarization modes of slightly different propagation velocity.
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NOT FOR USE OUTSIDE OF VERIZON AND JDSU What is Fiber Characterization? The ability to test fibers prior to commissioning with services that could be interrupted and/or dropped due to fiber performance issues.
NOT FOR USE OUTSIDE OF VERIZON AND JDSU Before Fiber Characterization is completed several questions need to be answered in order to meet the specific performance requirements for your network. First, what do you want to accomplish? Link Characterization or complete Network Characterization. This slide details the difference between the two test.
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NOT FOR USE OUTSIDE OF VERIZON AND JDSU The laser source sends a signal at a know power level into the fiber, and the power meter measures the reflected power level at the same location.
NOT FOR USE OUTSIDE OF VERIZON AND JDSU OTDR’s are similar in principle to: Copper TDR Radar Sonar Shoot from one end collect reflected signal tie round trip time to one way distance.
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NOT FOR USE OUTSIDE OF VERIZON AND JDSU - What is fiber characterization? A series of tests to perform network base-lining on a fiber network. Fiber characterization mainly consists of the 5 following tests: - Optical Insertion Loss - Optical Return Loss - Optical Time Domain Reflectometry traces - Chromatic Dispersion testing - Polarized Mode Dispersion testing
NOT FOR USE OUTSIDE OF VERIZON AND JDSU
NOT FOR USE OUTSIDE OF VERIZON AND JDSU - What is fiber characterization? A series of tests to perform network base-lining on a fiber network. Fiber characterization mainly consists of the 5 following tests: - Optical Insertion Loss - Optical Return Loss - Optical Time Domain Reflectometry traces - Chromatic Dispersion testing - Polarized Mode Dispersion testing
NOT FOR USE OUTSIDE OF VERIZON AND JDSU - What is fiber characterization? A series of tests to perform network base-lining on a fiber network. Fiber characterization mainly consists of the 5 following tests: - Optical Insertion Loss - Optical Return Loss - Optical Time Domain Reflectometry traces - Chromatic Dispersion testing - Polarized Mode Dispersion testing
NOT FOR USE OUTSIDE OF VERIZON AND JDSU - What is fiber characterization? A series of tests to perform network base-lining on a fiber network. Fiber characterization mainly consists of the 5 following tests: - Optical Insertion Loss - Optical Return Loss - Optical Time Domain Reflectometry traces - Chromatic Dispersion testing - Polarized Mode Dispersion testing
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NOT FOR USE OUTSIDE OF VERIZON AND JDSU We hope this Webex on OTDRs has been helpful. Whether you are supporting Long Haul, Metro, Access or Premise networks, there are a number of test topics that will apply to your and your network. Don’t hop off yet, there’s still more info…