Description Anritsu has introduced the MW9076D1, a four-wavelength optical time domain reflectometer (OTDR) with very high wavelength accuracy, which can be used for conventional OTDR applications and chromatic dispersion measurements on wavelength division multiplex (WDM) transmission systems.

The new unit operates at wavelengths of 1310, 1450, 1550 and 1625nm ±3nm (+/-0.5nm in chromatic dispersion measurement mode). Dynamic range at these wavelengths is 34, 33, 32 and 29.5dB. Dead zone for back-scattered light is less than 6m. The MW9076D1 offers simple measurement of chromatic dispersion from one end of an optical fibre. The operator is given measured figures for group delay, total dispersion figure, zero dispersion wavelength and dispersion slope for the fibre being measured.

Among features of the unit are a market-leading real-time sweep mode of 0.15s and a fully automatic mode in which all complex settings such as distance range and pulse width can be automatically executed. Measurement speed in this mode is significantly increased. A series of operations, such as measurement, wavelength switching, data saving, optical channel switching and next optical fibre measurement, can be executed automatically under preset measurement conditions. This mode is particularly useful for measuring a multi-core optical fibre.