Optical Spectrogram Scope Using Time-to-Two-Dimensional Space Conversion and Interferometric Time-of-Flight Cross Correlation

Diversity of Optical Signal Processing Led by Optical Signal Form Conversion

“…There is now much research proceeding in this field. For example, we have proposed new approach for optical measurement [9,10], optical pulse synthesizer [11,12], optical label recognition [13,14], and digital-to-analog (D/A) [15] conversions, and optical limiter [16].…”

New tool for response characteristic test of optical devices : Optical Spectrogram Scope

“…Both spatial projections of an optical signal and a reference pulse on the plane P2 sweep with time each other and they leave an interference fringe pattern at the overlapped position. Since x and y-axes correspond to time and frequency on the output plane P2, the temporal distribution TF n of a certain frequency ω n is approximately given by, [3,4] Sub-headlines are underlined and start on the left-hand margin. The paragraph should start on the same line.…”

“…On the other hand, we have also developed a time-frequency map monitor with more simple way; optical spectrogram scope (OSS). [3,4,5] OSS can visualize a time-frequency status of an ultra-fast optical signal from optical devices in a bird's-eye view. In addition, various time and frequency resolution data can be observed with controlling them in at least video rate.…”

Advanced optical limiting function based on effective understanding of physical phenomena

“…To observe a series of spectrogram, we adopted optical spectrogram scope (OSS) as a measurement tool. [13], [14], [15] The spectrogram is a kind of time-frequency distribution and it produces a visual representation of a time dependence of spectrum in an optical pulse. In this experiment, we used a light source whose pulsewidth is 0.7 ps and an input pulse is generated through 1 nm band-pass filter at the 1559 nm center wavelength.…”