OZC Digital Products – Transcription

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OZC Digital Products – Transcription

The primary products of the digital products line are fiber optic transceivers which conform to the industry multi-source agreement (MSA).

Micro-OTDR SFP transceivers carry Ethernet data, just like any SFP transceiver does, but with the unique added feature of detecting, locating, and reporting optical fiber faults instantaneously.  The Micro-OTDR feature’s technology, and know-how, are protected by U.S. Patents, and has been recognized by the Lightwave Innovation Awards.

Micro-OTDR SFP transceivers are available in two configurations:

  1. Single-Fiber, Single-Wavelength (SFSW), CWDM:
  2. Here is the functional block diagram of the SFSW CWDM Micro OTDR iSFC®.
  3. The Data-Only, but Micro-OTDR compatible, CWDM SFP. When linked with a Micro-OTDR SFP, this supports all of the available automatic features of the Micro-OTDR SFP.
  4. Here is a brief description of the Single-Fiber Micro-OTDR, and how it is best deployed.
  5. Dual-Fiber, CWDM, Conventional SFP: configuration
  6. Here is the functional block diagram of the Dual-Fiber, CWDM, Micro-OTDR iDFC™.
  7. Here is a brief description of the Dual-Fiber, CWDM, Micro-OTDR SFP and how it is best deployed.

How does the Micro-OTDR function?  What the Micro-OTDR does is it detects the edges of optical reflections, calculates the distance to the reflection source, and now, the iSFC® model, also measures ORL (optical return loss), to calculate the fiber link optical SNR (optical signal to noise ration) upon startup.  It does not automatically measure optical power or attenuation, and it does not directly measure reflectance.  The Micro-OTDR sends out optical pulses, then listens for the returning optical echoes.  This optical echo detector calculates, and reports, the distance to an optical fiber break.

RIO® (reflection immune operation) allows our iSFC® models to operate in any standard optical fiber cable plant.

Here we see the basic principles of operation of the Micro-OTDR, showing how things work, and what happens with the loss of signal.  This is why we call it the Fast Fiber Fault Finder™.

Applying statistics, we can calculate the probability of detecting optical faults over a defined optical fiber span, or link distance.  Here we see the plots of the optical fiber fault detection probabilities for a series of ORLs over spans of up to 80 kilometers.

Here is the Rule of Thumb:

If the roundtrip optical loss (dB) to and from the “fault” (could be to the end of the optical fiber), plus the optical return loss (ORL) of the “fault”, is equal to, or less than, the Dynamic Range of the Micro-OTDR, the “fault” will be detected.

Deploying the Micro-OTDR SFPs on both ends of the optical fiber link, significantly improves the probability of detection for random faults.  Deploying Micro-OTDR SFPs on multiple optical fibers in the trunk, also significantly improves the probability of detection for random faults.

You communicate with, and control, the Micro-OTDR feature via SNMP on the host Switch.  The Micro-OTDR creates a link birth certificate at the commissioning of an optical fiber link and eliminates the detection time component of the MTTR (mean time to repair or recovery) costs.  Some typical network applications are depicted here.

Our Metro-Ethernet CWDM access network example shows the Metropolitan New York City ISP (internet service provider) who has deployed our iSFC® models.  The iDFC™ models are used for OSC (optical supervisory channel) applications, for transmission and monitoring of dark fiber, front haul and backhaul applications.  Depicted in this example is a high speed DWDM data center connection.

 The AS2-S11-S-GE-5 Media Converter, Mini Switch, allows testing of the Micro-OTDR SFP, right out of the box, and also offers the ability to bolt-on the Micro-OTDR feature to already deployed Switches.

In selecting a Micro-OTDR SFP, the questions to ask are which configuration, and which model to select.

If you have any questions, please feel free to contact Michael J. Hartmann (VP | Business Development | Digital Products), at Optical Zonu Corporation.

Thank you.