Big Bear Networks 
Makes transponders which use digital signal processing (DSP) to automatically correct for fiber impairments.
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.
E2O Communications Inc 
Makes pluggable and fixed transceivers and transponders for rates ranging from 100 Mbps to 10 Gbps.
ExceLight Communications, Inc 
Offers transceivers, transmitters, receivers, lasers, photodiodes, GaAs integrated circuits, and passive components for optical communications.
Fiberxon, Inc 
Manufactures modular optical link interfaces for communication systems.
Finisar Corp. 
Provides fiber optic solutions for the fiber channel, gigabit ethernet and CATV markets.
InterIntelligence, Inc 
Makes parallel optical transceivers, some with pluggable ability. Formerly Optobahn Corp.
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.
RiteKom 
Manufactures passive and active fiber optic components.
SK Opto Electronics Inc 
South Korean based maker of optoelectronic chips and 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.
Xanoptix, Inc 
Manufactures MT-style ferrules, multichannel optics and hybrid ICs (where GaAs or InP is attached to silicon).
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