81491A Reference Transmitter

Keysight 81491A

Reference Transmitter

Introduction

Keysight's 81491A Reference Transmitter is designed to offer excellent eye quality for NRZ and PAM4 signals at baud-rates up to 32Gbaud and can serve as universal E/O converter. It comes in Multimode (MM) and Single-Mode (SM) flavors and includes internal lasers at 850nm (MM) or 1310&1550nm (SM). External optical input for usage with tunable laser sources is available for the SM option. The integration in the LMS mainframe offers a variety of advanced features such as automated bias-point and power control, remote control via SCPI language and much more. The LMS mainframe platform also offers seamless integration into various performance and compliance test solutions like optical receiver stress test. The separation of the signal source and the modulator is the only way to offer a zero chirp modulation. This is essential for a clean and repeatable eye diagram when modulating with an appropriate clean external source to fulfill the requirements of the IEEE standard. Another advantage of this design compared to directly modulated transmitters is the wide extinction ratio range that can only be achieved with this design.

Benefits

• Repeatable and reproducible measurements permit lower production test margins and improved specifications of the characterized devices. 
• Reliable measurements ensure comparability of the test results. 
• Support for full compliance to IEEE 802.3 stressed eye test in combination with Keysight’s Optical Receiver Stress Test solutions. 
• Wide extinction range offers highest test range coverage to ensure best quality of the tested devices under all target operating conditions. 
• Rapid test reconfiguration with dual-wavelength to switch between 1310 nm and 1550 nm by remote control or manually without exchanging a module. 
• Scalability with integration into industry-standard Keysight LMS platform extends your optical workbench capabilities. 
• Fast signal calibration and optimization through integration with Keysight automation software

Application

• Reference transmitter for stressed eye compliance test according to IEEE 802.3. 
• Creation of arbitrary optical modulation signals in combination with waveform generators. 
• General transmission system test with special pulse patterns in combination with a pattern generator.