With an ever-increasing demand for complex optical transmission systems, such as DWDM, there is a growing market for products to accurately monitor and control the increasing number of wavelengths being used as they become more narrowly spaced.
To meet these new requirements, Hamamatsu Photonics developed its G8050-G8053 series of InGaAs photodiode arrays with CMOS readout.
These sensors deliver high sensitivity and stable operation in the near-infrared spectral range, while still retaining a high resolution of a 25 µm pitch. The package is hermetically sealed for high reliability and the window has an anti-reflective coating for efficient light detection. Signal processing circuits on the CMOS chip allow a selectable feedback capacitance, by supplying an external voltage. The image sensor operates over a wide dynamic range and has low noise and low dark currents. Due to its built-in timing generator these sensors are simple to operate. They also benefit by having low crosstalk, reducing interference between sensors.
Hamamatsu Photonics also introduced the G6854-01, a new InGaAs photodiode with an 80 µm diameter sensitivity area. The photodiode has a spherical lens window with anti-reflective coating, which minimises return lighting and gives high sensitivity around 1500 nm. The CD package offers a high degree of base positioning accuracy, which allows for easy positioning. This style of package also offers high coupling efficiency to fibre and easy optical alignment. The product can be supplied as the discrete component, in connectorised housing or pigtailed to fibre.
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