Optical wavelength division multiplexer and/or demultiplexer with mechanical strain relief

In an optical wavelength division multiplexer and/or demultiplexer for single-mode or multi-mode fiber optic communication systems, wherein n channels are transmitted through a single fiber optic cable having n different wavelengths and wherein the optical couplings and alignment of the optical pathway of the device are achieved by forming and joining a prefabricated optical block to the first end of a molded coupling module to avoid post-fabrication alignment and adjustment of the optical pathway otherwise required, the improvement comprising:

• a housing,
• a fiber optic cable receptacle carried by the second end of said molded coupling module,
• mounting ear means carried by said molded coupling module, and
• support means carried by said housing for providing mechanical strain relief for transferring loads applied to said fiber optic cable receptacle to said support means, whereby said loads applied to said receptacle do not adversely affect said optical pathway of the assembled device.