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Wavelength division multiplexers are a critical part of a photonic telecommunications network, enabling service providers to increase transmission traffic simply by adding more wavelengths of light. The high-density wavelength division multiplexer (HDWDM) from the Jobin-Yvon Division of Instruments SA is the first multiplexer to provide high channel density (up to 41 standard, and several hundred channels components under development), low channel spacing, low insertion losses, low crosstalk, high wavelength temperature stability and almost on polarization dependence.
In wavelength division multiplexing (WDM), optical information from multiple fibres (single mode or multimode), each carrying a slightly different wavelength, is combined (multiplexed) and then transmitted through a single fibre. At the other end of the network, the individual wavelengths are separated (demultiplexed) back into the original number of fibres using a second WDM.
The HDWDMs have an unregulated thermal stability of 0.012 nm/C at 1550 nm between -25 and +65 C.
The HDWDMs are unaffected by continuous-wave optical power up to 20 dBm, making them compatible with optical amplifiers. Polarization dependence is less than 5 per cent. HDWDMs achieve channel spacings down to 0.5 nm with a bandwidth of 0.24 nm in a 20 channel multiplexer or 41 channel multiplexer with losses of 2 to 8 dB and crosstalk of -30 to -55 dB. Channels spacings down to 0.05 nm are expected in the near future.
The devices can be used in optical integrated broadband communications: transmission trunks, optical switches, cross connects and add/drop in wavelength routing systems.
The components are small solid blocks fibre-spectrometers. As such they can be used in spectroscopic instrumentation for biology, medicine, environmental monitoring as well as in industrial process controls.
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