The Agilent (now Keysight Technologies) N7752C is a single-mode, dual-channel optical attenuator equipped with two independent optical power meters, mainly used for optical transceiver and network integration testing. Its features are as follows:
Diverse power setting and control modes: It has a power setting mode, which controls the optical output power through the feedback signal of the photodiode, can automatically correct input power changes, and has a typical repeatability of ±0.02dB. In the attenuation mode, the calibrated value of attenuation can be directly set without a power monitor, which is suitable for old software written for attenuators without a power monitor or when the power monitor reading is affected.
Precise measurement and calibration: The two independent optical power meters can measure the absolute power of external optical fibers, used to calibrate the offset of the attenuator output monitor and correct external insertion loss. The power meter is equipped with an analog voltage output, which can provide feedback for auto-alignment applications in linear or logarithmic scale, and the logarithmic mode helps to track the signal level in a wide dynamic range.
Advanced power change control: The power change rate can be set, ranging from 0.1 to 1000dB/s, suitable for testing devices sensitive to rapid power changes. It can also be programmed to set the ramp of the attenuation step, including the dwell time of each step, which can be automatically stepped or synchronized with an external trigger, and has a trigger output function.
Comprehensive calibration functions: It has a comprehensive offset function, which can calibrate the optical path in various test settings, including independent offsets of the attenuation factor and output power level. It can also store wavelength and offset value pairs to compensate for wavelength-dependent effects in the optical path. Through the additional optical power meter channel of the N7752C, calibration is easier and more convenient, and the power-related offset can be automatically determined through firmware functions.
Convenient user attenuation mode calibration: A new self-calibration function has been implemented for the selected source wavelength. At the selected wavelength and a power higher than 0dBm, keep the settings stable, and the calibration process takes about 2 minutes. For different wavelengths, user calibration can be disabled or calibration can be performed at the new wavelength. The calibration data can be re-enabled after presetting or restarting, and the configuration can also be saved and calibration can be enabled.
Easy to operate: It has a built-in graphical user interface, no software installation is required, and the device can be accessed and controlled through GbE LAN and USB 2.0 interfaces, which is convenient for users.
Excellent key performance indicators: The attenuation range is 0dB to 40dB, the insertion loss is less than 2.2dB, and the wavelength range is 1260nm to 1640nm, which can adapt to a variety of optical test scenarios.
