A measurement solution for optical transmitter compliance testing on the Agilent 86100D digital communications analyzer uses system impulse response correction, or SIRC, which enables multimode optical receivers with bandwidths in excess of 25 GHz and single-mode receivers with near 100-GHz bandwidths.
With these capabilities, R&D engineers can visualize and accurately quantify the quality of designs for optical components and systems. Manufacturing engineers can increase confidence in the accuracy of their optical transceiver compliance testing.
Next-generation optical transmitters compatible with multimode optical fiber are expected to soon operate at data rates in the 25 Gb/sec range. With the large physical size of multimode-compatible photodetectors, optical oscilloscope channels have not been able to provide the bandwidth necessary for accurate waveform analysis.
With SIRC, Agilent now provides an advanced calibration capability that can boost the measurement bandwidth of the 86105D from 20 GHz to more than25 GHz.
SIRC also enables the 86105D to be configured as a multimode reference receiver for standards-based compliance testing at both 25 and 28 Gb/sec rates. The 86115D can now provide a quad-port reference receiver for 4×25 Gb/sec 100-Gb Ethernet test.
By performing an impulse-response analysis, the oscilloscope channel’s frequency response is precisely determined. Using this information, the 86100D DCA can correct frequency response deviations and provide waveform results as if the reference receiver were ideal.
Using the SIRC calibration, the 86100D mainframe can make real-time corrections to the raw waveforms. The displayed signal appears as if it had been acquired with a system that has an ideal frequency response. The SIRC process also enables the possibility of a reference receiver for virtually any data rate within the physical limits of the system. The user has the flexibility of increasing or decreasing the effective bandwidth of the measurement system approximately 50 percent from the nominal hardware capabilities.
The SIRC process accurately preserves random signal components such as jitter and noise.