Response characteristics test of ultra-fast optical devices with optical spectrogram scope (OSS)

In this paper, we review and introduce the optical spectrogram scope (OSS) as a powerful measurement instrument for response characteristic test of ultra-fast all-optical devices and sub-systems in photonic networks. In general, most of optical signals in photonic networks are basically composed of time and frequency resources. Since ultra-fast optical devices generate, receive, and cut through these signals, their response characteristics in time-frequency domain would provide for very useful information for device qualities. Our time-frequency map monitor; OSS can visualize a time-frequency status of an ultra-fast optical signal in a birdpsilas-eye view. In addition, various time and frequency resolution data can be observed with controlling them in at least video rate. We apply OSS to optical signals from optical encoders and visualize its time-frequency status in a birdpsilas-eye view to demonstrate its usefulness for response characteristics test of ultra-fast optical devices including passive devices.