Commercial grade advanced (for the day) Avalanche photodiode with preamp module, hermatically sealed and Gold plated body and leads. Offered for custom projects or educational use.
HISTORY:
Removed from secure fibre optic communications equipment used by the Federal Government, the equipment having been updated due to technological redundancy - prior to dismantling, the equipment was fully operational.
Technological redundancy? You bet! Technology advances in leaps and bounds and while this receiver module was used with 10Gbps optical systems, the current standard for high speed is 800Gbps and 1T is just around the corner - this module is like the old man with a walking frame but it is offered at far less than modern components!
Optical communications has the advantages of extremely wide bandwidth (bandwidth of this component is 8.5GHz) 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
FUJITSU (FOC Japan) - Optical Communications Receiver Module
DIL package, this was mounted in a PCB socket - not soldered.
Part number FRM13R621CU
Structure: InGaAsP/InP APD with preamplier module
Wavelength (centre): 1310nm
Designed originally for use in long haul 2.5Gb/s fibre communication systems
Module body: 20.4mm x 12.7mm x 5.65mm height
14 pins, all Gold plated (as is the body)
Pitch is measured as 2mm (industry standard)
SPECIAL NOTE: Physically I count 13 pins! It looks to me as though one pin has broken away from the body BUT this is a Ground pin, one of three pins that are only connected to the body. The lack of this pin should not affect operation at all.
Fiber tail is 100cm length
Terminated with a SC P GREEN connector
Supplied with a mating SC A GREEN panel mount socket, ready to create your own optical patch panel
3x plastic fiber clamps are supplied, these are used to route the excess fiber around the PCB (DO NOT CUT OR BEND THE FIBER AT SHARP ANGLES)
Pin designations ... now heres the rub!
Old technology can be notoriously difficult to find detailed datasheets and I have not found any specific to this device. This is a device from the early 2000's afterall, prehistoric in the world of optical electronics!
Much of the information I have obtained is extrapolated from a device in the same class, the FRM5 series but that information is of no help regarding the pin designations. So we have 11 active pins (the remaining 3 are connected directly to the casing) but what do they do? That is for you, the experimenter, to find out.
Perhaps it may be helpful to know the pinouts of the FRM5N series, note that those devices only have 9 pins, not 14!
COSMETIC CONDITION:
EXTREMELY carefully removed from equipment (ESD precautions and also stored in ESD bags)
Module pins have always been 'buried' in ESD foam and will be supplied the same way.
Fiber cable has been handled with care, no sharp bends and certainly no "kinks"
Pins are all clean (minus one Ground pin) and ready for socket insertion.
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) This module and the rack modules they were installed in were absolutely fully functioning prior to removal.
I have NOT re-tested this module since removal from the card PCB though.
See the photograph showing the receiver module packed in a hard plastic case - this is how they will be received, not loose!
