Feature: T&M


precisely timed data at extremely high speeds. Therefore, among the key developer requirements for SS-OCT digitizers are sampling rates of 1-5GSPS, bandwidths of at least 1-2GHz, a high dynamic range, low noise and low- latency processing. The high sampling rates accurately


capture rapidly swept interferometric signals. Imaging depth is proportional to digitizer sampling rate and laser coherence length. Increasing swept- source laser sweep rates, coherence length and k-clock frequencies are driving the need for higher speed digitizer technology. Up to 5GSPS capability ensures that even the fastest swept lasers can be sampled with high fidelity, capturing high-frequency fringe frequencies and preserving axial resolution. This high sampling rate, combined with excellent analogue front-end performance to 2.5GHz, allows developers to fully exploit the bandwidth of modern SS-OCT light sources without compromise. The wide analogue bandwidth


Table 1: Advantages of SS-OCT over SD-OCT


Table 2: Selected performance figures for a number of ADQ3-series digitizers


Figure 1: ADQ35 digitizer with on-board real-time SS-OCT processing using a dedicated application-specific firmware, FWOCT www.electronicsworld.co.uk July/August 2026 39


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