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PICO MACOM
Fiber Optic
Series
Chapter 1
Introduction
1.
Introducing the Pico Macom PFT 1310nm Optical
Transmitter
1310 nm OPTICAL TRANSMITTER
STATUS
STATUS
RF AGC ON/OFF
RF AGC ON/OFF
MGC
ADJUST
LASER
LASER ON/OFF
LASER ON/OFF
RF
AGC
MGC
RF
RF
RF TEST PORT
PFT-1310mn Optical Transmitter
The PFT-x 1310nm Optical Transmitter is a 1 RU (1.75 high x 19 inches) chassis with one 1310 nanome-
ter (nm.) Optical Transmitter included. The PFT accepts an analog input in the 54 to 860 MHz range and
modulates this RF signal onto an internally generated optical signal source for transmission over single
mode optical fiber systems to a distant optical receiver that removes the original RF signals from the optical
carrier and outputs the 54 to 860 MHz RF signal for further use at that location. The use of the 1310nm
Optical Transmitter allows transmission over distances beyond reasonable RF transmission distances with
significantly less impairments. Users or this device will include anyone carrying video and data in a RF
signal; most commonly, cable companies that need to add one to a handful of additional 1310 nm signals
to an existing headend or hub, or add a single remote RF signal carriage from a hub or secondary headend
back to the main headend or to another hub.
The PFT-x may be ordered with a range of optical output powers by substituting the desired power (in dBm)
for the ‘-x” in PFT-x. This power is fixed in the factory at time of manufacture, based on part and design
selections. Users should identify the ‘link’ budget for the distances, splits, and splices in their fiber, plus
the optical power needed for their receiver input before ordering the transmitters. (Pico Macom also offers
PFR Optical Forward Receivers for this application.) Users may add external optical attenuation to tune
(reduce) the optical power into their link if the transmitter output is higher than the application needs. (Pico
Macom offers optical passives for this purpose.) Contact your Pico Macom Sales Representative for further
assistance if needed.
Optical output connectors on the Pico Macom PFT are SC/APC type, common to the cable industry and
used for their low loss and back reflection. Other connectors, most commonly, FC/APC type are used and
may be available; see your sales representative for special ordering.
The PFT accepts an RF signal within the 54 to 860 MHz range, using a cable industry standard F-connector.
This signal may carry analog NTSC modulated carriers or QAM carriers or any mixture of analog and QAM
carriers. The signal may be one 6 MHz modulated channel (or less) or up to 134 channels. Specification
for RF signal input are based on 78 channels of load (power) and users are encourage to adjust input levels
up or down depending on load to optimize RF signal C/N, CTB, and CSO distortions at the receive site.
