Finisar Corp.
Provides fiber optic solutions for the fiber channel, gigabit ethernet and CATV markets.

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.

Picolight, Inc.
Makes single and parallel fiberoptic transceivers.

Stratos Lightwave, Inc.
Manufactures fiber optic components, including single and parallel transceivers, fiber assemblies, WDM modules.

Xanoptix, Inc
Manufactures MT-style ferrules, multichannel optics and hybrid ICs (where GaAs or InP is attached to silicon).

Optical Communication Products, Inc (OCP)
Manufactures optical transmitters, receivers, transceivers, and transponders.

Blaze Network Products
Manufactures CWDM (coarse wavelength division multiplexing) transceivers, some with multiple channels. Focused on the 10 Gbps Ethernet (XAUI) and SONET markets.

Network Elements, Inc
Manufactures 10 Gbps optical transponders and transceivers. Also produces a 10 Gbps network processor IC.

Oplink Communications, Inc
Provides custom design and manufacturing services for optical components.

SK Opto Electronics Inc
South Korean based maker of optoelectronic chips and transceivers.

Big Bear Networks
Makes transponders which use digital signal processing (DSP) to automatically correct for fiber impairments.

Opnext, Inc
Develops pluggable and fixed mount transmitters, receivers, transcievers, transponders, and discrete optical modules for rates ranging from 155 Mbps to 10 Gbps.

E2O Communications Inc
Makes pluggable and fixed transceivers and transponders for rates ranging from 100 Mbps to 10 Gbps.

InterIntelligence, Inc
Makes parallel optical transceivers, some with pluggable ability. Formerly Optobahn Corp.

OptoIC Technology, Inc
Produces single and parallel optical transceivers ranging from 155 Mbps to 10 Gbps.

Luminent, Inc
Produces transceivers for the CDWM, long-wavelength, and FTTx (fiber curb, home, and business) markets.

Coretek Opto Corp
Produces optical modules as well as fixed and pluggable optical transceivers.

Fiberxon, Inc
Manufactures modular optical link interfaces for communication systems.

ExceLight Communications, Inc
Offers transceivers, transmitters, receivers, lasers, photodiodes, GaAs integrated circuits, and passive components for optical communications.

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.

OPTICAL ZONU Inc.
Produces active and passive fiber optical modules, especially for PON and FDDx applications.

RiteKom
Manufactures passive and active fiber optic components.

Optillion
Manufactures fiber-optic Ethernet transceivers for 10 Gbit/s and above. Based in Sweden.