Thorlabs offers a wide selection of communication instruments that are ideal for telecommunication (telecom) and data communication (datacom) applications. Our offerings include reference transmitters, high-speed detectors and receivers, lasers, optical amplifiers, electro-optic (EO) modulators, calibrated electrical-to-optical converters, spectrum analyzers, tunable filters, microwave cables, and optical switches. Also available are fiber components such as fiber couplers / splitters, wavelength division multiplexers (WDMs), and fiber attenuators, as well as our full suite of fiber processing and inspection equipment. These products operate at or are compatible with common telecom and datacom wavelengths from the O- to the U-bands, with particular focus on 850 nm, 1310 nm, and 1550 nm.