Equipment brief notes for “CATV + FTTH” triple play project staff (ii)

FOT Blog now is sharing a full equipment and accessory notes list (part two) for a FTTx project managers or engineers, who may be interested in this wide fiber network area.

Pre-installation key considerations

fiber cable iinstallation process

fiber cable installation process

  1. Always wear protective gloves and safety boots (with steel toe caps) when handling drums.
  2. Check that the cable specified has been procured.
  3. Inspect the cable drum for signs of excessive weathering and/or damage.
  4. Drums must be transported or stored with their battens intact.
  5. Do not accept delivery of an optical fiber cable should the drum is damaged. (More details in the link above)

What is a Direct Modulated Optical Transmitter

A optical transmitter working principle diagram

A optical transmitter working principle diagram

Working Principle

  Modern fiber-optic communication systems generally include an optical transmitter to convert an electrical signal into an optical signal to send into the optical fiber, a cable containing bundles of multiple optical fibers that is routed through underground conduits and buildings, multiple kinds of amplifiers, and an optical receiver to recover the signal as an electrical signal. The information transmitted is typically digital information generated by computers, telephone systems, and cable television companies.

Front and Back panel view of A Optical transmitter

What is a Direct Modulated Optical Transmitter?

  FOT series Optical Transmitter products adopt the high linearity, optical isolation, the DFB, thermoelectric cooling DFB laser produced by ORTEL 、AOI、Fujitsu、Mitsubishi and other world-renowned semiconductor companies. It can provide high-quality images, digital or compressed digital signal long-distance transmission for cable television and telephone communications. Built-in RF driver amplifier and control circuitry to ensure the machine’s CNR, CTB, CSO target. Comprehensive and reliable optical circuits and laser output power stability Temperature stability of thermoelectric cooler control circuit to ensure optimal machine performance and long-life laser stability.

Understanding DWDM system & components in minutes

WDM operating principle

WDM operating principle

“In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity.”

Filter-based WDM Device (FWDM)

Filter-based WDM Device (FWDM)

  A WDM system uses a multiplexer at the transmitter to join the several signals together, and a demultiplexer at the receiver to split them apart. With the right type of fiber it is possible to have a device that does both simultaneously, and can function as an optical add-drop multiplexer. The optical filtering devices used have conventionally been etalons (stable solid-state single-frequency Fabry–Pérot interferometers in the form of thin-film-coated optical glass). As there are three different WDM types, whereof one is called “WDM”, we would normally use the notation “xWDM” when discussing the technology as such.

3 answers to “what is SFP transceiver?”

  “The small form-factor pluggable (SFP) is a compact, hot-pluggable transceiver used for both telecommunication and data communications applications.”

  In order to satisfy some projects, whose telecom equipment or networking device needs SFP transceiver requirement. FOT now is offering full series of SFP/SFP+ solution:

FOT SFP/SFP+ solution series

FOT SFP/SFP+ solution series

  For better sharing SFP transceiver modules, FOT blog is collecting three different definition knowledge of  this hot-pluggable transceiver (from Internet).

No. 1 Small Form-Factor Pluggable (SFP) Definition

 Small form-factor pluggable (SFP) is a specification for a new generation of optical modular transceivers. The devices are designed for use with small form factor (SFF) connectors, and offer high speed and physical compactness. They are hot-swappable. 

FOT Topic: How to debug problems in GPON/EPON

How to debug problems in PON

How to debug problems in PON

Methods 1: Ensure  that  all connections are clean and correct

Ensure that all connections are cleaned as standard for FOI guidelines. Any foreign bodies or grease from hands will cause laser and therefore bandwidth fluctuations. Ensure that FON is tested including splitter outputs. If network is thoroughly tested then check the OLT port output.

Methods 2: Collect as much diagnosing data as possible

Throughput issues are difficult to diagnose. Have you gone into your OLT’s EMS statistics pages? What about the edge router CLI? Home router/gateway? Are you seeing large queue depths? High packet drop rates? Large numbers of CRC errors and/or uncorrected FEC errors? Is the problem load sensitive? Do upstream and downstream load factor correlate?
If a simple investigation doesn’t yield an obvious cause, you’ll need expert help.

Ask for more Fiber or CATV telecom equipment details!

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