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Leaird, Daniel E.,Weiner, Andrew M.,Seo, Dongsun Institute of Korean Electrical and Electronics Eng 2014 전기전자학회논문지 Vol.18 No.1
We report stable, wideband, flat-topped, 10 GHz optical frequency comb generation from a semiconductor-based mode-locked ring laser with an intra-cavity high finesse Fabry-Perot etalon. We demonstrate a stable 10 GHz comb with greater than 200 lines within a spectral power variation below 1 dB, which is the largest value obtained from a similar mode-locked laser in our knowledge. Greater than 20 dB of the spectral peak to deep ratio at 0.02 nm resolution, ~92 femtosecond timing jitter over 1 kHz to 1 MHz range, and non-averaged time traces of pulses confirm very stable optical frequency comb lines.
Daniel E. Leaird,Andrew M. Weiner,서동선 한국전기전자학회 2014 전기전자학회논문지 Vol.18 No.1
We report stable, wideband, flat-topped, 10 GHz optical frequency comb generation from a semiconductor-based mode-locked ring laser with an intra-cavity high finesse Fabry-Perot etalon. We demonstrate a stable 10 GHz comb with greater than 200 lines within a spectral power variation below 1 dB, which is the largest value obtained from a similar mode-locked laser in our knowledge. Greater than 20 dB of the spectral peak to deep ratio at 0.02 nm resolution, ∼92 femtosecond timing jitter over 1 kHz to 1 MHz range, and non-averaged time traces of pulses confirm very stable optical frequency comb lines.
Low-Loss Ultrawideband Programmable RF Photonic Phase Filter for Spread Spectrum Pulse Compression
Hyoung-Jun Kim,Rashidinejad, Amir,Weiner, Andrew M. IEEE 2015 IEEE transactions on microwave theory and techniqu Vol.63 No.12
<P>We demonstrate a low-loss, ultrawideband (UWB), programmable radio frequency photonic phase filter utilizing a broadband optical frequency comb, interferometric pulse shaping configuration, and a balanced photodetector for spread spectrum pulse compression. We present UWB linear frequency-chirped pulse compression with bandwidths exceeding 7 GHz. The filter insertion loss for these experiments can be as low as 0.5 dB. In addition, the bandwidth and chirp rate of the phase filter are programmable. To further illustrate the programmability of the proposed filter, we report pulse compression experiments for UWB Costas sequences with bandwidth over 6 GHz. Finally, we perform a spread-spectrum jamming-resistant pulse compression experiment with the chirp filter, where a processing gain of ~ 17.3 dB, proportional to the time-bandwidth product of the filter, enables the recovery of a transmitted UWB signal in the presence of jamming.</P>
Arbitrary Waveform Generation via Spectral Line-by-Line Pulse Shaping on Mode-Locked Pulses
Seo, Dong-Sun,Jiang, Zhi,Weiner, Andrew M. Institute of Korean Electrical and Electronics Eng 2006 전기전자학회논문지 Vol.10 No.2
We have built a grating-based, high-resolution, spectral line-by-line pulse shaper. By controlling individual spectral lines of a mode-locked laser output, we demonstrate the interesting functionalities of the pulse shaper for arbitrary waveform generation, such as width tunable pulse generation, phase controlled waveform generation, microwave waveform generation, etc.
서동선,박종대,Daniel E. Leaird,Andrew M. Weiner 한국광학회 2015 Current Optics and Photonics Vol.19 No.4
We examine the principle of a modified Pound-Drever-Hall (PDH) technique to measure the free spectralrange of a Fabry-Perot etalon (FPE). The FPE’s periodic transmission of phase-modulated light allowsus to adopt a sampling theorem to develop a new relationship for the PDH error signal. This leads usto find the key parameters governing the measurement accuracy: the phase modulation index β and theFPE finesse. Without any additional complexity for background noise reduction, we achieve a measurementaccuracy of 0.5 ppm. The improvement is mainly attributed to the wide-band phase modulation approachingβ = 10, and partly to the use of both reflected and transmitted light from the FPE and good FPE finesse
서동선,앤드류 와이너,Seo, Dong-Sun,Weiner, Andrew M. Institute of Korean Electrical and Electronics Eng 2005 전기전자학회논문지 Vol.9 No.2
모드잠금 고리형 광섬유 레이저 출력의 단열 쏠리톤 펄스압축에 의해 $1545{\sim}1550\;nm$ 파장영역에서 400 ??토초의 안정성이 뛰어난 변환제한급의 10 GHz의 광 펄스를 발생시켰다. 특별한 슈퍼모드 선택소자를 사용하지 않고도 -123 dB/Hz 이하의 슈퍼모드 비팅 잡음 억제에 의해 $1\;kHz{\sim}100\;MHz$의 잡음대역에서 100 ??토초 미만의 낮은 시간 지터를 얻었다. We report 400 femto-second highly stable, nearly transform-limited, pulse generation at 10 GHz in $1540{\sim}1550$ nm wavelength region by adiabatic soliton pulse compression of an actively mode-locked fiber ring laser output. Without using any supermode selection device, supermode beating noise has been suppressed below -123 dB/Hz, resulting less than 100 femto-second timing jitters at the noise band of $1\;kHz{\sim}100\;MHz$.