The MN4765B is a characterized, unamplified photodiode module. It is used as an optical receiver with the Anritsu MS4640B Series VectorStar VNAs to perform highly accurate and stable optoelectronic measurements of both modulators (E/O) and photoreceivers (O/E).

The MN4765B is the base calibration module part number only. Customers are required to also order an option to configure the bandwidth and wavelength coverage such as the MN4765B-0070 (Option 70), which configures the calibration module for 70 kHz to 70 GHz frequency and 1550 nm wavelength coverage. This option consists of an InGaAs photodiode that converts modulated optical signals to electrical signals, and includes additional circuitry for temperature and bias stability. The photodiode has exceptional bandwidth response to 70 GHz and a typical responsivity of 0.7 A/W. The MN4765B with Option 110 configures the module for 70 kHz to 110 GHz for 1550 nm. It is characterized in both magnitude and phase using a NIST derived calibration standard to 110 GHz.

Option 71 is characterized form 70 kHz to 70 GHz at 1310 nm, while Option 72 is characterized from 70 kHz to 70 GHz at both 1310 and 1550 nm.