Low cost commercial grade laser diode for R & D (much lower cost than a brand new component) custom projects, or educational use.
Optical communications is the way forward, extremely wide bandwidth and immunity from external influences such as EMI, RF and widely used in highly secure installations where it is not desirable to have "unauthorised" access to communications links.
Typical commercial uses are telecommunications, data networks and digital signal transmission
This optical device was removed from secure law enforcement communications systems (upgrade) but are not just limited to that purpose.
I have included a basic block diagram of a typical laser diode communications (transmitter) design, "something to give the users an idea" - you can start with a very basic design (and it's inherent limitations) or design an extremely sophisticated "fail safe" laser communications module based on this Fujitsu laser device
Included in the package is a photo diode and this monitor photodiode receives emission power from the rear facet of the laser diode and can be used to control the optical power coupled into the fiber.
This device is the basis for an optical communications transmitter, I also have 1330nm receivers/diodes for use as receivers listed separately.
Here are some of the technical details ...
Sumitomo Laser Diode with PD
Part number SLT4261-CS
Structure: InGaAsP/InP MQW-DFB laser diode module
Wavelength (centre): 1310nm
Pf is typically 2mW output, absolute maximum 3.5mW
Incorporates a single stage isolator
Flange type mounting, 12.7mm hole spacing - supplied with mounting hardware
Designed originally for use in long haul 2.5Gb/s fibre communication systems
Fiber tail is 80cm length
Terminated with a SC P BLUE connector
Supplied with a mating SC A BLUE panel mount socket, ready to create your own optical patch panel
3x plastic fiber clamps, used to route the excess fiber around the PCB (DO NOT CUT OR BEND SHARPLY)
Pin designations are shown in one photograph, 4 pins (laser diode & PB)
COSMETIC CONDITION:
EXTREMELY carefully removed from equipment (ESD safety observed)
Fiber cable has been handled with care, no sharp bends and certainly no "kinks"
Leads to the diode assembly are clean and ready for re-soldering
NOTE: These leads were soldered to the original equipment boards "flat" onto pads not through hole, this is how they are designed to be mounted, not "through hole" like a transistor
TESTING:
Removed (eventually - we had to wait for special clearance before making the "cutover" to the new equipment as maintaining of communication system integrity was critical for the client) These devices and the rack modules they were installed in were absolutely fully functioning prior to removal.
I have NOT re-tested them since removal though.
Stored in a special container to ensure the safety of the fiber cable especially.
