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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.
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
Reconfigurable all-optical code translation in spectrally phase-coded O-CDMA
Jiang, Z.,Seo, D.S.,Leaird, D.E.,Roussev, R.V.,Langrock, C.,Fejer, M.M.,Weiner, A.M. IEEE 2005 Journal of Lightwave Technology Vol.23 No.6
Reconfigurable all-optical code translation are demonstrated in a spectrally phase-coded optical-code-division multiple-access (O-CDMA) testbed with an interference user. For both one-stage and two-stage code translations, less than 0.9-dB power penalties are induced at each code translation. Multistage code translations are investigated via simulation and experimental emulation in a loop pulse shaper to show the potential application of the proposed method for up to several tens of code translations.
Spectral line-by-line pulse shaping.
Jiang, Z,Seo, D S,Leaird, D E,Weiner, A M Optical Society of America 2005 Optics letters Vol.30 No.12
<P>We experimentally demonstrate pulse-shaping experiments in which the individual spectral lines that are present in the output of a mode-locked laser (8.5 GHz mode spacing, centered at 1542 nm) are resolved. The shaped pulses overlap in time, and this leads to a new way to observe fluctuations of the comb-offset frequency in the time domain.</P>
Four-user 10-Gb/s spectrally phase-coded O-CDMA system operating at /spl sim/30 fJ/bit
Zhi Jiang,Dongsun Seo,Shangda Yang,Leaird, D.E.,Roussev, R.V.,Langrock, C.,Fejer, M.M.,Weiner, A.M. IEEE 2005 Photonics Technology Letters Vol.17 No.3
<P>We demonstrate a four-user 10-Gb/s spectrally phase-coded optical code-division multiple-access system via nonlinear processing with ultralow power (/spl sim/30 fJ/bit). Full interference suppression is achieved in a time-slotted scheme without the need for chip-level coordination and synchronous detection. Performance degradation caused by pulse overlap between users is investigated.</P>