Fiber Optic Multiplexer

Best Fiber Optic Multiplexer? Why they're so good? Wiki with product examples

The best reason to get familiar with a fiber multiplexer is the fact that it saves a lot of money. Cable itself is not cheap, but it has the ability to send several communications over its length at the same time. The cost of implementing separate channels for each data source is higher than the price for providing the multiplexing/demultiplexing functions. So, by putting a multiplexer at one end and a demultiplexer at the other, your company will manage to save a tons of money.

Best fiber optic multiplexers

We have prepared a list of a few great multiplexer products from Thor 

Wavelength Division Multiplexing (WDM) is the process of using different colors of light to transmit multiple data streams through fiber optic cable. Since the different colors of light have different wavelengths, they do not interfere with each other.

Features

Transport up to eight full rate HD-SDI digital video signals at 1.5Gbps each over a single strand of fiber cable up to 80km long. This Unit provides a multiple SDI over Fiber channels, each one carries their own embedded audio and ancillary data and operates as if it were the only signal on the fiber

Features

  • Supports 8 Full HD-SDI @ 1.5Gbps or lower SDI
  • Transports embedded audio channels as well as SDI ancillary data
  • Return path serial RS-485 channel for controlling equipment on Tx end
  • Link alarm indicators on both Tx & Rx indicate a problem with the fiber
This Device is a 1 channel bidirectional HD-SDI video optical transceiver. This Unit Provides 10/100Mb/s Ethernet Data transmitting (RJ45) with Unidirectional RS-485 Control data over optical single-mode fiber.

Features

This Device is a 1 channel bidirectional HD-SDI video optical transceiver. This Unit has 2 Shared Bi-directional 10/100Mb/s Ethernet Data transmitting (2 RJ45 Ports) with Unidirectional RS-485 Control data over optical single-mode fiber with optional 2 Analog Audios.

Features

 

This Device is a 4 channel Unidirectional HD-SDI video optical transceiver. This Unit Provides 1 Shared Bi-directional 10/100Mb/s Ethernet (2 RJ45 Ports). It also allows additional AUX Cards RS-232 and RS-422. This Unit can carry external analog audio instead of the SDI embedded audio

Features

 

This Device is a 1 to 8 Channel Universal platform for multiplexing SD/HD 3G SDI, DVB-ASI, Analog CVBS Video, Analog Audio, AES/EBU Audio, RS Data, 10/100 and Gigabit Ethernet over 1 Fiber Cable

Features

  • Compact design with 1U height, 19 inch, which can be installed on standard rack
  • Optical port
    • Supports optical signal loss indication
    • With APC circuit to achieve stable output optical power
    • Two reserved optical ports for cascaded application. The available wavelength can be ordered.
    • Supports FC/SC/ST-PC connector
  • SDI
    • Supports 1485Mb/s and 270Mb/s, complying with SMPTE-292M and SMPTE-259M
    • Supports DVB-ASI at 270M/b
    • As an option, supports 2970M/b, complying with SMPTE-424M 3G-SDI
    • SDI loop out and dual SDI output can be selected at the transmission and receiving terminals respectively
    • Supports [email protected], 50, [email protected], 29.97, 25, 24, 23.98, [email protected], 59.94, 50,  [email protected], 59.94, 50, 30, 29.97, 25, 24, 23.98, and 625i, 525i
    • With integrated SDI re-clocker and cable equalizer
    • Built-in ESD and surge protection facility to prevent damage from external strikes
    • Supports lock status indication of SDI input and output
  • DVB-ASI  /SMPTE310
  • Serial data over 75-ohm coaxial cable at rates at or less than 270 megabits per second
  • Transmission of an MPEG Transport Stream MPEG2-TS / H-264-TS
  • 75ohm BNC Connector
  • The 188 / 204 byte format supported
  • Gigabit Ethernet
    • Complying with IEEE 802.3, auto negotiation for 10M/100M/1000M
    • One RJ45 connector for one gigabit Ethernet, support auto MDI/MDIX function
    • Indicators for LINK/ACT and bit rate status
  • Analog or AES/EBU Audio(XLR interface)
    • Up to 8 balanced XLR interfaces
    • Supports AES/EBU or S/PDIF audio format transparent transmit with bit rate of 3.072Mb/s
    • Supports AES/EBU or S/PDIF audio lock status indication
  • Auxiliary service
    • Phoenix terminal interface, every five terminals are used as a group and the service type can be configured for every group independently
    • Supports audio, RS232, RS422, RS485 and contact closure
  • Provides dual power redundancy: AC220V/AC110V, DC-48V and DC+24V can be selected

 

What is a fiber optic multiplexer?

A fiber multiplexer is a device, where one input can be routed to a lot of different outputs, usually 16. It utilizes fiber optic technology, is usually controlled by use of software and a rotator block, and has an optical path that is actually coupled through several COL-UV/VIS collimating lenses. Other Multiplexers utilize CWDM and are relatively simple machines, that just insert different wavelengths of light. 

A multiplexer (or mux) is a device that joins several data signals together and enables them to be transmitted over a single dark fiber network. Inversely, a demultiplexer is a takes a single input and selects signals of the output of the compatible mux, which is connected to the single input, and a shared selection line. A multiplexer is often used with a complementary demultiplexer on the receiving end. These mux/demuxers maximize the use of the dark fiber and minimize operating costs when multiple traffic channels need to be transported between several sites.

How does a fiber optic multiplexer work?

Fiber optic multiplexers are used at one end of a fiber optic cable so that many things can send information over the same wire. It is like a giant multi-input connector, allowing for several signal inputs which are later sent over a single strand of fiber optic cable. This information travels along this wire until it contacts with a demultiplexer, which is like an another attachment at the end of the cable that again splits up the signals and sends them on their way. In some cases, the far end system might have functionality greater than a simple demultiplexer, and while the demultiplexing still occurs technically, it may never be implemented discretely.

This would be typical when a multiplexer serves a number of IP network users and then feeds directly into a router, which immediately reads the content of the entire link into it’s routing procesor, and then does the demultiplexing in memory from where it would be converted directly into IP sections.  Multiplexers are mainly used to increase the amount of data that can be sent over the network within a certain amount of time and bandwidth. A multiplexer is also called a data selector.


There are two different techniques used for multiplexing which have different grids or channel spacing. The first one is CWDM - Course Wavelength Division Multiplexing, which ranges from 1270nm to 1610nm with 20nm steps. The maximum numer of channels it can reach is 18. The other technique is DWDM, where the 'D' stands for Dense. This typically has a spacing of 0.8nm and is around 1550nm. The maximum amount of channels you are allowed to use is 80.


Inverse multiplexers – what does it mean

An inverse multiplexer allows a data stream to be broken into multiple lower data rate communication links. An inverse multiplexer varies from a demultiplexer because the multiple output streams from the former stay inter-related, whereas those from the latter are unrelated. An inverse multiplexer is the opposite of a multiplexer, in that it divides one high-speed link into multiple low-speed links, while a multiplexer combines multiple low-speed links into one high-speed link. Inverse multiplexers are used, for example, to combine a number of ISDN channels together into one high rate circuit, where a higher rate connection than can be available from a single ISDN connection is needed. This is particullary useful in areas, where higher rate circuits are not available. An alternative to an inverse multiplexer is using three separate links and loading sharing of data between them. In case of IP network packets could be sent in round-robin mode between each separate link. Advantages of using inverse multiplexing over separate links include: lower link latency, fairer load balancing and network simplicity.



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