This excerpt taken from the FNSR 10-K filed Feb 10, 2005.
Optical Subsystem Design. We established ourselves as a low-cost design leader beginning with our initial Gbps optical subsystems in 1992. From that base we have developed single-mode laser alignment approaches and low-cost, all-metal packaging techniques for improved EMI performance and environmental tolerance. We develop our own component and packaging designs and integrate these designs with proprietary manufacturing processes that allow our products to be manufactured in high volume.