N4378A 220 GHz Lightwave Component Analyzer
기술 개요
The Keysight N4378A Lightwave Component Analyzer (LCA) delivers fully calibrated opto-electronic S-parameter measurements up to 220 GHz, addressing the growing test challenges of next-generation optical components used in AI and data-center applications. It combines newly designed optical test heads with the NA5305A Frequency Extender or NA5307A Frequency Extender, and the 85065A Precision Calibration Kit 0.5 mm. The configuration is completed by one of Keysight’s PNA/PNA-X Vector Network Analyzers (VNA) and the N5292A Test Set Controller. The new LCA enables engineers to perform single-sweep measurements up to 170 GHz or 220 GHz at 1310 nm and 1550 nm wavelengths using on-board lasers. With additional laser sources, more wavelengths in the O-band and the C/L-band can be covered.
With 220 GHz bandwidth, engineers can verify the design of their 1.6/ 3.2 Tb/s optical transmitter and receiver components and refine their simulations with real-world measurements.
In its most complete configuration, capable of performing S-parameter measurements on photodiodes and optical modulators, the N4378A includes an N4378RA optical receiver, and an N4378TA optical transmitter connected to an N4378CA transmitter controller. Both optical heads come with an N4378FA mechanical fixture that ensures proper mechanical alignment between the NA5307A or NA5305A frequency extender heads which extend the bandwidth of a standard PNA/PNA-X up to 250 GHz electrical bandwidth. The LCA software is installed on the PNA and provides comprehensive user guidance for electro-optical measurements. New wizards help novice and experienced users through more complex measurement tasks. Through the new N4370AMFA software license, advanced measurement functions can be unlocked that automate Total Harmonic Distortion (THD), Relative Intensity Noise (RIN) and gain compression measurements on optoelectronic components.
A configuration specifically suitable for the measurement of optical transmitters or optical modulators consists of only the N4378RA optical receiver combined with a PNA/PNA-X, N5292A test set controller and a minimum of two NA5307A/NA5305A frequency extenders. Three frequency extenders are required for modulators with symmetrical/ dual drive input.
Likewise, a configuration for the measurement of optical receivers or photodiodes consists of only the N4378TA optical transmitter, the N4378CA transmitter controller, a PNA/PNA-X, N5292A test set controller and two NA5307A/NA5305A frequency extenders.
The high bandwidth of the NA5307A and NA5305A frequency extender heads demanded the development of a new, 0.5 mm coaxial connection, as well as a new 85065A 0.5 mm calibration kit. To deliver complete measurement capabilities, Keysight has collaborated with top-tier industry solution partners for RF probes, coaxial adapters and test cables for the 0.5 mm coaxial eco system.
To minimize stress on the 0.5 mm coaxial connections, the N4378FA mechanical fixture enables accurate and repeatable mechanical alignment between the coaxial ports of the optical head and the frequency extender head. Once an optical or electrical head has been initially aligned and mounted on a mounting plate, the quick release system allows moving the heads between positions needed for user calibration or for measurements. Additional base plates can be used to extend the quick release function to probe holders.