32 mW CATV RF Over Fiber Tx 45-870 MHz

F-RF-1310-TX-32mW
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Description Features Drawings Specification Q&A Documents Support
Description

RF over Fiber Tx - 32mW Output 45-870 MHz

1310nm - 32mW fiber optic transmitter for Television RF (Radio Frequencies) from 45-870 MHz.  Directly converts any incoming RF signal within this band to optical RF.  Transports all channels and programs over one fiber.  Can be used for point to point, or combined with PLC couplers and fiber optic splitters for point to multipoint applications.  Outputs Industry standard RFoG (RF over Glass) signals that can be accepted by most fiber optic RF receivers from other manufacturers.  Easy to read front panel LCD provides information and alarm data, and simplifies configuration.  This system features a highly linear DFB laser with automatic adjustment circuitry with Automatic Gain Control.  For added reliability, a second internal Power Supply Unit is available as an option.

 

 

Transmitter can be used with any or Thor Fiber optical RF receivers

Features

 • 32 mW Optical Power Output from sensor feedback controlled laser system
 • Transports entire 45-870 MHz band even with full channel linups
 • Create high security "Fiber Breaks" to eliminate coax signal return path
 • Automatic Gain Control (AGC) manages RF level with no adjustment needed
 • Compatible with all Thor RFoG CATV series optical receiver systems

IMPORTANT NOTE*** (it is very important to interface our unit with SC/APC - Angle Polished Connector to avoid any light reflections.

If your fiber is terminated with the  SC, ST, FC /PC flat connector, you need to use an optical jumper from PC type to SC/APC for proper conversion. 

Drawings
Specification
*All Specifiactions Subject to Change Without Notice
  • Input

1x Type-F connector - 75 Ohm

  • Optical Wavelength
1310nm
  • Line Width:
< 1 MHz   FWHM
  • Extinction Ratio
>20 dB XP
  • Equivalent Noise Intensity
< -160 dB/Hz
  • Output Power
32 mW
  • Return Loss
>55 dB
  • Optical Connector

SC/APC - Angle Polished

IMPORTANT NOTE*** (it is very important to interface our unit with SC/APC - Angle Polished Connector to avoid any light reflections.

If your fiber is terminated with the  SC, ST, FC /PC flat connector, you need to use an optical jumper from PC type to SC/APC for proper conversion. 

  • RF Power Level
11-29 dBmV AGC Managed
  • Flatness
<± 0.75    45 - 862 MHz
  • SBC Restrain
>17 dBm
  • CNR
>50 dB @ 10km fiber length
  • CTB
< -63 dB
  • CSO
< -57 dB
  • Dimensions
19 x 10 x 1.75 inch
  • Weight
2.5 kg
  • Operating Temperature
0 - 45 ?
Question and Answers
Answer:
1) Are these all point to point with single mode fiber in place? https://thorbroadcast.com/products/cable-tv-catv-rf-45-900mhz This is our page of dedicated CATV frequency band Transmitters and Receivers, The rackmount OTx and Mini or Rackmount Receiver sets are the most popular because of their longstanding history of durability 2 points I need to make off the bat, RF can only be put on Singlemode Fiber, Putting it on multimode is impossible; the signal deteriorates at a massive level because of the wide core creating reflections, no one in the world makes gear like that because theoretically, it is impossible Second we can use distance to make approximate guesses at what power optical OTx you'll need, if they're short with minimal patch panels we can guess. If they are longer runs I would hope you can get an OTDR reading of the optical loss in the Fiber. RF on fiber needs to be dedicated, and optical budget is what we work around to decide what power laser you need. 2) So at this juncture because of your short runs, I would go with a single high power OTx; use an optical coupler and mini receivers. This basic diagram shows you a simple layout; single Transmitter; optical coupler which eats a lot of power, and you can run your CATV Clear QAM into the transmitter and get cable everywhere else Yes this equipment carries the entire echelon of CATV DVB-C RF modulation; meaning it carries 45-870Mhz or approximately channels 2-135. https://thorbroadcast.com/product/1-x-2-to-1-x-128-fiber-optic-couplers.html/224 This page shows you how optical couplers eat power, the chart at the bottom is what we use with our units; other companies might vary The coupler essentially dictates how powerful of an OTx you need. What I suggest you do is make sure of exactly how many end locations you have; then we work backward, Couplers come in 1x2 1x4 1x8 etc so if you have 4 runs then need to add a 5th it really isn't simple. So planning ahead is crucial to future proof you don't need to replace the coupler and OTx
Answer:
So you're on the right track. 
Right now you're only required to send the signal to two buildings, but you will need to expand to 16 buildings?
 
If you think at most the run might be about 2 miles then hopefully the fiber installed has very mild loss, you should be fine with a 1310nm 32mW OTx. 
1550nm is only recommended with the use of an EDFA that is used to distribute the signal to dozens of end locations. 
In your case having a maximum of 16 endpoints with minimal distance is not a good reason to use 1550nm.
 
I would suggest this as a BOM:

F-RF-1310-TX-32mW transmitter

F-RF-RX-RM receiver

https://thorbroadcast.com/product/catv-rf-fiber-receiver-high-rf-power-rack-8230.html

F-PLC-1x16-SC/APC optical splitter

https://thorbroadcast.com/product/1-x-2-to-1-x-128-fiber-optic-couplers.html/227

 

Since the transmitters and receivers, all use SC/APC; I would make sure the PLC Coupler follows suit to minimize any reflections. 

Answer:

There are several types of losses that can occur in fiber optic cables, including:

  1. Insertion loss: This is the loss of signal power that occurs when light is transmitted through the fiber. It is typically caused by imperfections in the fiber itself, such as bends, scratches, or impurities.

  2. Splice loss: This occurs when two fibers are joined together, typically through a splicing process. Losses can occur due to imperfections in the splicing technique, as well as the difference in the refractive index between the fibers being spliced.

  3. Connector loss: This occurs when light is transferred between two fibers through a connector. Losses can occur due to imperfections in the connector itself, such as dirt or damage.

  4. Absorption loss: This is caused by impurities in the fiber that absorb light, reducing the signal strength. The main cause of absorption loss is the absorption of water molecules in the core of the fiber.

  5. Scattering loss: This is caused by microscopic variations in the refractive index of the fiber, which cause light to scatter and be absorbed.

  6. Macrobending Loss: This is caused by the fiber being bent in a radius of curvature that is too large. This causes the light to be reflected back into the cladding and is lost.

  7. The use of passive optical splitters results in each splitter having its own insertion loss. For example, the F-FOS-1x2 1x2 splitter has a 4.5dB insertion loss

These losses can be mitigated by using high-quality fiber optic cables, connectors, and splicing techniques, as well as by regularly inspecting and maintaining the fiber optic network.

 

Insertion loss in fiber refers to the loss of signal power that occurs when light is transmitted through a fiber optic cable. In single mode fiber, insertion loss is typically measured at 1310nm and 1550nm wavelengths, which are the most commonly used wavelengths for long-distance telecommunications.

The insertion loss at 1310nm is typically higher - 0.35db/km  than at 1550nm -0.25db/Km , due to the fact that the attenuation coefficient at 1310nm is smaller than at 1550nm. However, the use of 1550nm allows for a larger transmission window and can support higher bandwidths, making it more suitable for high-speed data transmission.

Insertion loss can also occur at the connections and splices within a fiber optic cable. These losses are caused by imperfections in the connectors and splicing techniques, as well as by the difference in the refractive index between the fibers being spliced. To minimize these losses, high-quality connectors and splicing techniques must be used. This loss should not exceed 0.1dB per connecion

. Additionally, insertion loss can occur at connections and splices due to imperfections in connectors and splicing techniques. To minimize these losses, high-quality connectors and splicing techniques must be used, This loss should not exceed 0.1dB per connecion

--

To calculate the optical budget, you need to take into account all of the losses that occur in the fiber optic link, including attenuation, connector loss, and splice loss. The optical budget is calculated by subtracting the total losses from the transmitter output power.

In this case, the transmitter outputs +15dBmV and the receiver has 0dBmV receiver sensitivity. To calculate the optical budget, you would subtract the receiver sensitivity from the transmitter output power:

Optical budget = Transmitter output power - Receiver sensitivity Optical budget = +15dBmV - 0dBmV Optical budget = 15db

It's important to note that the receiver sensitivity is usually given in negative dBmV. So, in this case, the receiver sensitivity of 0dBmV is equivalent to -0dBmV.

It's also important to note that the optical budget should be greater than the receiver sensitivity to ensure that there is enough power to reach the receiver and also to take into account any other losses that may occur in the link.

Additionally, depending on the application, the optical budget should be designed with a margin of safety, to account for changes in the link such as temperature, aging, or unexpected loss.

 

Answer:

1)

Okay we certainly have the gear available that you need, but to narrow it down I just have a couple basic questions. 
 
What is the distance of your single mode fiber? Do you already have SC/APC terminations on the singlemode? 
 
Do you need bidirectional or is this application just going unidirectionally?
If this is uni- directional transmission ( Cable TV video only)
you can use those TX/RX units , 1 single mode fiber is required SC/APC fiber connects
F-RF-TX-MN-2mW
F-RF-RX-MN-2
 
 
If this is Bi-directional ( Cable TV + Internet)
You can use this unit, 2 single mode fibers are required, SC/APC fiber connects
F-RFoF-TX/RX
 
 

 

2)

Unfortunately not because it is impossible to put RF on multimode; no company offers such a product because it simply won't work. 
It's absolutely mandatory to use singlemode fiber

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