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Optical Coupler Unit

Technical Information

Catalogue No: C0321
Category: Unknown
Object Type: Module/Sub-Assembly/Component
Object Name: Optical Coupler Unit
Part No: 31-011-03
Serial No: 008
Manufacturer: Marconi-Elliott Avionic Systems Ltd
Division: Unknown
Platform(s): YC-14 
Year of Manufacture: circa 1975
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Main Object Store

Marconi-Elliott Avionics
Optical Coupler Unit
Part No. 31-011-03
Serial No. 008
Boeing Part No. 748-253120-23
Protective cover must be fitted when unit is disconnected
Part of YC14 1975/76


The YC-14 was an experimental STOL aircraft made by Boeing. It had a high wing with the twin engines mounted above the wing and Blown Flaps to give the STOL performance. The Digital Flight Control System provides full control of all primary aerodynamic control surfaces and engine thrust. The objective was to reduce crew workload during the busy STOL mode to a level compatible with a two-man crew. The system has full fly-by-wire control and has a variety of operating modes such as STOL, high Mach or high altitude cruise, low altitude, stores delivery and single engine operation. The system is triple redundant to meet mission and safety reliability requirements. Data is transmitted between channels via a single time multiplexed fibre-optic link which provides complete electrical isolation between redundant channels and eliminates electromagnetic interference.
A full aircraft set of equipment comprises three Computer Units (CU), three Interface Units (IU), three Optical Coupler Units (OCU), three Optical Data Links (ODL), a Control and Display Panel (CDP) and a Test/Fail Ident Panel (T/FIP).

The Optical Coupler Unit contains the electrical/ optical and optical/electrical inter facing circuits for the cross channel serial digital signals. Bowthorpe Hellerman Electronic Components Division supplied the Optical Data Links (ODL) and optical sub-assemblies for fitting in the Optical Coupler Unit to a Marconi-Elliott specification.

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