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Short description:

MFL provides wideband optical link for up to 4 RF channels combined in a SINGLE fiber thanks to CWDM technology


SETUP OPTION 1: MFL-TT / MFL-RR (2 channels = 1 x diversity receiving)

SETUP OPTION 2 : MFL-TTRR / MFL-RRTT (4 channels = 1 x diversity transmitting & 1 x diversity receiving)

SETUP OPTION 3: MFL-TTTT / MFL-RRRR (4 channels = 2 x diversity receiving)

NOTE: System is customisable and designed as per the requirements of each client / projecy


SETUP OPTION 1 Configuration

  • MFL side A (TT)
    • 1 x MFL-BASE Rackmount unit
    • 2 x MFL-TX modules
    • 1 x MFL-BF1 RF filter
    • 1 x MFL-OMS optical demux
  • MFL side B (RR)
    • 1 x MFL-BASE Rackmount unit
    • 2 x MFL-RX modules
    • 1 x MFL-OMS optical demux

SETUP OPTION 2 Configuration

  • MFL side A (TTRR)
    • 1 x MFL-BASE Rackmount unit
    • 2 x MFL-TX modules
    • 2 x MFL-RX modules
    • 1 x MFL-BF1 RF filter
    • 1 x MFL-OMS optical demux
  • MFL side B (RRTT)
    • 1 x MFL-BASE Rackmount unit
    • 2 x MFL-RX modules
    • 2 x MFL-TX modules
    • 1 x MFL-OMS optical demux

SETUP OPTION 3 Configuration

  • MFL side A (TTTT)
    • 1 x MFL-BASE Rackmount unit
    • 4 x MFL-TX modules
    • 1 x MFL-BF1 RF filter
    • 1 x MFL-OMS optical demux
  • MFL side B (RRRR)
    • 1 x MFL-BASE Rackmount unit
    • 4 x MFL-RX modules
    • 1 x MFL-OMS optical demux



  • The MFL units are setup and calibrated in the Wisycom factory.
  • Fibre cable:
    • Connector : SC/APC
    • Type : MULTI-MODE


* prices exclude antennaes and fibre cable


See OPTION SETUP SAMPLES 1, 2 and 3 example layouts in the images above


MFL provides wideband optical link for up to 4 RF channels combined in a single fiber thanks to CWDM technology.

It is designed to allow for a flexible and modular configuration thanks to a mainboard that can be fitted with up to 4 plug-in boards that can be any combination of two types:

  • TX: Laser optical transmitter, (CDWM) plug-in board
  • RX: Optical-receiver plug-in board

Example: MFL-TTTT is 4 laser transmitter unit that works with a MFL-RRRR with 4 channel receiver. Other configurations are also possible like MFL-RR / MFL-TT or a mixed like a MFL-RRTT with both receiver and transmitter channels.

System Overview

The system is composed by a MFL-BASE (1U rack frame) and some optional/modular boards to build the desired configuration.

MFL-BASE can have up to 4 optical modules that can be either TX or RX (factory installed) to adapt the unit to several configurations.

To simplify the usage we give a name of the final configuration that easy identify the CWDM channels and a color code for the RF connectors (N type).

We use as default 4 laser wavelength although the CWDM standard can allow to use much more with a 20nm wavelength separation:

  • Channel 51 short name for wavelength 1510 nm
  • Channel 53 short name for wavelength 1530 nm
  • Channel 55 short name for wavelength 1550 nm
  • Channel 57 short name for wavelength 1570 nm




Color Identifier


Wavelength 1510 nm laser, single mode



Wavelength 1530 nm laser, single mode



Wavelength 1550 nm laser, single mode



Wavelength 1570 nm laser, single mode


For example:

  • MFL-TTRR has 2 Tx on ch.51/53and 2 Rx on ch 55/57
  • MFL-RRTT has 2 Rx on ch.51/53 & and 2 Tx on ch 55/57
  • MFL-TT-- has 2 Tx on ch.51/53 and no module on ch 55/57
  • MFL-RR-- has 2 Rx on ch.51/53 and no module on ch 55/57


Following the main code and option that can build up a MFL system:








19' 1U Rack units , aluminium frame

Oled display - Ethernet - failsafe switch - realtime clock

AC Powered 230V



Optical RX module for MFL (CWDM)



Laser TX module for MFL (CWDM)





Insulated DC power with battery monitor (10÷28Vdc)



Module Mux/Demux for 1:4 CWDM



RF filter 25MHz tuning range over 404÷788 MHz


Key Features

LOW NOISE DESIGN to allow great coverage when used to remote receiving antennas

HIGH INTERFERENCE IMMUNITY thanks to high IIP3 design and a control/compensation of gain

EASY TO USE thanks to integrated RF/optical power meter and optical power compensation

REAL-TIME CLOCK with a backed-up static RAM to monitor and record internal RF levels and service data (i.e. laser life time)

TX UNIT (remote RF reception, i.e. diversity antennas):

  • MFL units can incorporate a digitally tuned filter (25 MHz bandwidth, center frequency tunable over 404-788 MHz).
  • It can route RF through an external filter or to additional receiver (redundancy) to easily implement a failsafe configuration that can switch on a redundant receiver or transmitter if any fault is detected
  • It automatically monitors RF levels and intervenes to avoid fiber saturation

RX UNIT (RF transmission, i.e. single-frequency master/slave areas)

  • It can route an IFB high power signal to transmit locally and send low power IFB carrier over fiber to slave units
  • When it is working along with a MTK952MS in slave configuration, the fiber loss is automatically recovered and the units increase the gain so that the transmitter power equals the target level (measured with an SWR meter integrated into the MTK952MS)

REMOTE MONITOR/CONTROL thanks to a data link on Ethernet 10/100 Base Tx


  • 4 N connector female 50Ω with switchable 12V boosting power (only on transmitter modules)
  • 2 BNC-F 50Ω each optical transmitter module, failsafe option or external RF filter
  • 1 BNC-F 50Ω each optical receiver module, failsafe option OPTICAL INPUT/OUTPUT: 5 connectors SC-APC type DATA LINK: RJ45: 10/100 Base TX


  • AC INPUT: 90V-264V~, 47-63 Hz, 2A fused, max 60 Watts
  • DC INPUT: 10-28Vdc (max 5A), [XLR-4M] VDC-pin 4 / GND-pin 1 / NC-pin 2 / NC-pin 3

RF Over Fiber Provides Many Benefits For Wireless Audio Applications

by Leslie Lello - Wisycom Italy

Fiber optic links provide enhanced opportunities to connect wireless microphones over long distances.

Using fiber optic links to interconnect RF for wireless microphones offers many benefits. Clean signals, much longer interconnect distances and easy build-out are among the advantages an RF- over-Fiber solution can bring.

The advent of wireless audio connectivity has brought with it tremendous gains in the flexibility of television production in both studio and field production environments. Today, wireless microphones are often used for live, on-scene news reporting, in sports and music events, and in the creation of documentary and commercial content.

The advantages provided by cable-free audio include enhanced freedom of movement for reporters and performers, speedier setup and teardown, the elimination of boom shadows and associated shot blocking problems. And, wireless operation may mean that fewer crew members are required.

Early solutions

Spurred by the growing adoption and success of wireless microphone technology, equipment manufacturers have added wireless IFB connectivity and wireless intercom for production crews. Such features in new equipment enhance television and cinema production flexibility and operational ease.

Early wireless audio systems typically required the installation of receivers (and transmitters where two-way communication was required) in a small equipment rack along with a suitable antenna system. This equipment package was typically placed close to the shooting location to ensure good signal strength and then was connected to the studio or production van with conventional multicore audio cables.

Such nearfield placement of receivers/transmitters also helped overcome some of the interference issues which have become common in today’s world of ever-increasing use of RF devices and a shrinking amount of available spectrum. This technique enhanced a system’s signal-to-noise ratio and allowed wireless devices to be operated at lower output levels. The result was longer battery life while also reducing the potential for unauthorised reception and use of audio being transmitted.

This dual fiber cable is light-weight, flexible and easily installed at a broadcast or production site.

A coax solution

Despite the advantages provided by wireless audio connectivity, the use of the large and heavy copper cables posed a distinct disadvantage, as their weight and size slowed deployment and removal once the production was completed.

Some engineers tried to eliminate the multi-core cables by relocating the receiving equipment package near the production truck, retaining only an antenna system and an associated RF amplifier, at the production site.

Receivers for each RF channel were located in the remote truck, allowing direct access by the audio person, thus simplifying checkout and operational adjustments. Connectivity between the antenna system and this remotely-located receiving equipment was achieved via conventional coaxial cable.

While this worked, operational distances were limited by cable losses, which in the 470-800 MHz region can amount to as much as 50dB per 100 meters of cable. If long runs were needed, higher-performance coax was required, which meant extra weight—and higher cost. Such installations often required the use of one or more RF amplifiers, thus further adding to the complexity of the setup, and potential points of failure.

A fiber solution

A relatively new innovation in the wireless audio connectivity realm allows the replacement of the coaxial cable and associated line amplifiers with small, lightweight, and easily deployed fiber optic cable.

This Wisycom block diagram illustrates how a wireless microphone system can be located even miles from the mixing location by using a fiber optic interconnect.

The use of fiber optic cable for relaying radio frequency (RF) signals is not exactly new, dating back at least to the late1980s. Once suitable electrical-to-optical and optical-to-electrical transducers and associated modulation and demodulation equipment was developed, fiber technology was used for transporting 500 MHz blocks of L-Band (1 GHz range) RF signals between satellite receive antenna low-noise block downconverters (LNBs) to remotely located receivers. Only recently has such technology been applied to television/cinema wireless audio applications.

The advantages accrued by replacement of coaxial cable with fiber extend far beyond physical size and ease of deployment. Much greater interconnection distances are easily achieved, as typical single-mode fiber optical losses amount to only about 0.5 dB per kilometer.

Further, by employing CWDM (Coarse Wavelength Division Multiplexing) technology, one fiber strand can to be used to transmit multiple carriers bi-directionally, thus eliminating the need for separate receive and transmit cables.

Additionally, fiber can be easily routed to allow placement of the wireless receiving/transmitting gear in close proximity of the handheld or beltpack wireless devices being used. This is a big plus when working in large venues such as sports stadiums or outdoor concerts.

Fiber optic interface equipment designed expressly for the audio applications described, can be easily installed. Typical products feature laser diode transmitters and operate at 1510, 1530, 1550 and 1570 nanometer wavelengths.

What to look for when buying

When shopping for such a fiber optic-based system, potential adopters should look for equipment packages employing a modular architecture, rather than one that takes a “one size fits all” approach. A modular design allows users to precisely tailor a system to their particular application. Then, as requirements change, the system can be easily modified by adding or exchanging components.

Compact modular configurations also lend themselves to the creation of a fully redundant fiber linkage system. This type of solution can rely on off- the-shelf equipment with features such as; failure sensing and automatic switchover circuitry to further enhance operational reliability.

These Wisycom RF modules illustrate how an audio-over fiber optic system is compact and can be mounted in a small travel case, ready for immediate deployment.

Users should also look for such desirable features as automatic optical power level trimming. Another useful feature is the capability to internally record the received RF levels. This will help in troubleshooting and assist operators in determining if a laser diode may be nearing the end of its useful life. Optical power metering for individual channels also makes it easy to ascertain the overall health of the system and to quickly spot damaged fiber or poorly installed connectors.

Another useful feature—especially in today’s congested RF spectrum environment—is the inclusion of low-noise amplification at the receive antenna. Typical with virtually all state-of the-art broadcast electronic equipment is the use of integrated display panels to allow operators to perform initial system setup and to make operational adjustments. When choosing a fiber package, note the size of these meter displays. They need to be sufficiently large so they are easily readable under a variety of lighting conditions.

Today’s television and cinema productions depend more than ever on high-quality audio. One of the best ways to provide this is through the use of fiber-based transmission equipment.


  • RF to Optical modules (TX module) : 1 to 4
  • Optical to RF modules (RX module) : 1 to 4
  • Maximum number of modules : 4
  • RF to fiber link working modes : 2 (“ANT” mode or “IFB” mode)
  • Rear optical connectors : 5 SC/APC, other type on request
  • Internal optical CWDM MUX/DEMUX : 2 max (option MFLOMX)

“ANT” mode RF TX characteristics

  • Typical application : RX antenna remoting
  • Frequency ranges (front panel
  • selectable)
  • : ‐ 140 to 840 MHz (flat)
  • ‐ 470 to 840 MHz
  • ‐ 25MHz BW tunable band‐pass filter (opt*) (center freq. in 1MHz step, from 404 to 788 MHz)
  • ‐ External user band‐pass filter
  • External filter loss compensation : 0 to 6 dB
  • TX Gain : 0dB (user adjustable +6 to ‐20dB typ.)
  • Input IP3 : > 16 dBm typ.
  • Noise figure : < 20dB typ. (*)
  • SFDR : > 116 dB/Hz 2/3 typ.
  • RF input connector : N female 50 Ω
  • Antenna booster supply : 12Vdc 200mA max
  • External filter connectors : BNC female 50 Ω

“ANT” mode RF RX characteristics

  • RX Gain : 0dB (user adjustable ± 14dB typ.)
  • Failsafe option : yes, standard option
  • RF output connector : N female 50 Ω
  • Failsafe connector : BNC female 50 Ω

“IFB” mode RF TX characteristics

  • Typical application : “IFB” signal remoting (isofrequency systems)
  • Frequency range : 140 to 840 MHz
  • RF input level : ‐ 6 to 10 dBm
  • RF input level for 0dBm out (@ 0dB
  • gain)
  • : from ‐3dBm to + 10dBm
  • RF input connector : N female 50 Ω

“IFB” mode RF RX characteristics

  • RX output level : 0 dBm (user adjustable +6 to ‐20dB typ.)
  • Failsafe option : yes, standard option
  • RF output connector : N female 50 Ω
  • Failsafe connector : BNC female 50 Ω

Optical TX module (option MFLTX module OTB001)

  • Optical power : 3dBm (6dBm optional)
  • Wavelengths : 1511 or 1531 or 1551 or 1571 nm
  • Laser : low noise, low distortion DFB laser

Optical RX module (option MFLRX module ORB001)

  • Input optical power range : ‐5 dBm to 5 dBm
  • Wavelengths : 1490 to 1610 nm


  • Operating temperature : ‐20 to +55 °C


  • AC mains : 90 to 240 Vac, 60VA max
  • DC (option MFLDC) : 10‐28Vdc 3A frame floating

Dimensions and weight

  • Dimensions : 19”/1U, 430x44x370mm (Width x Height x Depth)
  • Weight : 4,5 kg

(*) Measured with “Ant” mode and 0 dB gain (standard “factory preset”) at 25 °C

Manual (Wisycom-MFL-Manual.pdf, 2,352 Kb) [Download]

Datasheet (MFL_WIDEBAND_OPTICAL_LINK.pdf, 2,088 Kb) [Download]

Tree menu (MFL_TreeMenu-v._1.1.pdf, 305 Kb) [Download]

R37 319.01 (R42 916.86 incl VAT)
R34 211.79 (R39 343.56 incl VAT)
R40 264.40 (R46 304.06 incl VAT)
R33 742.47 (R38 803.84 incl VAT)
R36 833.51 (R42 358.54 incl VAT)

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