Modules

Coretek Opto Corp - Produces optical modules as well as fixed and pluggable optical transceivers.
Corona Optical Systems, Inc. - Manufactures a pair of small, 12 port, 850nm transmitters and receivers for data rates up to 3.35 Gbps per channel.
ExceLight Communications, Inc - Offers transceivers, transmitters, receivers, lasers, photodiodes, GaAs integrated circuits, and passive components for optical communications.
Finisar Corp. - Provides fiber optic solutions for the fiber channel, gigabit ethernet and CATV markets.
Luminent, Inc - Produces transceivers for the CDWM, long-wavelength, and FTTx (fiber curb, home, and business) markets.
Oplink Communications, Inc - Provides custom design and manufacturing services for optical components.
Opnext, Inc - Develops pluggable and fixed mount transmitters, receivers, transcievers, transponders, and discrete optical modules for rates ranging from 155 Mbps to 10 Gbps.
Optical Communication Products, Inc (OCP) - Manufactures optical transmitters, receivers, transceivers, and transponders.
OPTICAL ZONU Inc. - Produces active and passive fiber optical modules, especially for PON and FDDx applications.
OptoIC Technology, Inc - Produces single and parallel optical transceivers ranging from 155 Mbps to 10 Gbps.
Picolight, Inc. - Makes single and parallel fiberoptic transceivers.
Stratos Lightwave, Inc. - Manufactures fiber optic components, including single and parallel transceivers, fiber assemblies, WDM modules.
TriQuint Semiconductor, Inc. - Develops optical modules as well as custom and off-the-shelf optical components, including EML (Electro-absorptive Modulated Laser), DFB (Distributed Feedback) and FP (Fabry-Perot) lasers and APD / PIN detectors.