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1.
Opt Lett ; 47(12): 3063-3066, 2022 Jun 15.
Article in English | MEDLINE | ID: mdl-35709050

ABSTRACT

We experimentally demonstrate a 400 Gbit/s optical communication link utilizing wavelength-division multiplexing and mode-division multiplexing for a total of 40 channels. This link utilizes a novel, to the best of our knowledge, 400 GHz frequency comb source based on a chip-scale photonic crystal resonator. Silicon-on-insulator photonic inverse-designed 4 × 4 mode-division multiplexer structures enable a fourfold increase in data capacity. We show less than -10 dBm of optical receiver power for error-free data transmission in 34 out of a total of 40 channels using a PRBS31 pattern.

2.
Opt Express ; 19(18): 16851-65, 2011 Aug 29.
Article in English | MEDLINE | ID: mdl-21935046

ABSTRACT

We report Carrier Envelope Offset (CEO) frequency measurements of a 10 GHz harmonically mode-locked, Fabry-Perot etalon-stabilized, semiconductor optical frequency comb source. A modified multi-heterodyne mixing technique with a reference frequency comb was utilized for the measurement. Also, preliminary results from an attempt at f-2f self-referencing measurement are presented. The CEO frequency was found to be ~1.47 GHz for the particular etalon that was used.

3.
Opt Express ; 18(17): 18284-91, 2010 Aug 16.
Article in English | MEDLINE | ID: mdl-20721221

ABSTRACT

We introduce a novel scheme for dynamic line-by-line pulse shaping with GHz update rates. Four lines of an optical frequency comb source are used to injection-lock four individual VCSEL, which are subsequently electrically modulated at 0.4 to 1 GHz through current modulation. This concept could be considered a completely new way of pulse shaping as the light is not simply modified, but rather regenerated with the desired properties. We also discuss an important drawback of line-by-line pulse shapers that ultimately limits the modulation speed capability.


Subject(s)
Lasers , Models, Theoretical , Optics and Photonics/instrumentation , Optics and Photonics/methods , Telecommunications/instrumentation , Equipment Design , Light , Microwaves , Time Factors
4.
Opt Lett ; 34(3): 238-40, 2009 Feb 01.
Article in English | MEDLINE | ID: mdl-19183617

ABSTRACT

We report the generation of optical pulse trains with 380 as of residual timing jitter (1 Hz-1 MHz) from a mode-locked external-cavity semiconductor laser, through a combination of optimizing the intracavity dispersion and utilizing a high-power, low-noise InGaAsP quantum-well slab-coupled optical waveguide amplifier gain medium. This is, to our knowledge, the lowest residual timing jitter reported to date from an actively mode-locked laser.

5.
Opt Lett ; 30(20): 2742-4, 2005 Oct 15.
Article in English | MEDLINE | ID: mdl-16252760

ABSTRACT

We report the generation of optical pulse trains with 8.5 fs timing jitter (10 Hz to 10 MHz) from a mode-locked semiconductor laser, with a slab coupled optical waveguide amplifier used as the gain element. This is, to our knowledge, the lowest residual timing jitter reported to date from an actively mode-locked laser.

6.
Opt Lett ; 27(9): 719-21, 2002 May 01.
Article in English | MEDLINE | ID: mdl-18007910

ABSTRACT

We report what is to our knowledge the lowest phase and amplitude noise characteristics achieved to date in a 10-GHz pulse train produced by the active harmonic mode locking of an external-cavity semiconductor diode laser. Supermode noise has also been suppressed below -140 dBc/Hz by use of a high-finesse fiber Fabry-Perot etalon as an intracavity filter. Novel noise sideband measurements that extend to the Nyquist offset frequency suggest a significant advantage in using harmonic (rather than fundamental) mode locking to produce ultralow-noise pulse trains, owing to the relationship between the noise roll-off frequency and the fundamental cavity frequency.

7.
Opt Lett ; 27(10): 872-4, 2002 May 15.
Article in English | MEDLINE | ID: mdl-18007956

ABSTRACT

We report measurements of the residual phase-noise knee position and longitudinal-mode linewidth of a hybridly mode-locked external linear cavity semiconductor laser as a function of laser cavity length. Excellent agreement between these measurements suggests a direct relationship between rms pulse-to-pulse timing jitter and average longitudinal-mode linewidth. This relationship leads to a fundamental limit in the timing jitter of mode-locked lasers.

8.
Appl Opt ; 39(36): 6799-805, 2000 Dec 20.
Article in English | MEDLINE | ID: mdl-18354694

ABSTRACT

A multiwavelength laser source composed of a single semiconductor optical amplifier and a commercially available off-the-shelf wavelength-division multiplexed (WDM) filter is constructed and tested under actively mode-locking operation. Five independent mode-locked wavelength channels are generated simultaneously, with a wavelength spacing of 1.6 nm established by the WDM filter. In addition, to demonstrate the potential of this mixed time-frequency, or hybrid WDM-optical time-division multiplexed, signal, we demonstrate a simple parallel-to-serial wavelength conversion to increase the pulse repetition rate of the mode-locked laser by a number of output wavelengths for applications in high-performance optical sampling applications.

9.
Opt Lett ; 24(4): 238-40, 1999 Feb 15.
Article in English | MEDLINE | ID: mdl-18071466

ABSTRACT

Wideband spectral phase correlation is demonstrated from a multiwavelength mode-locked semiconductor laser. By use of frequency-resolved optical gating techniques, significant phase correlation was observed between multiple intracavity oscillating wavelengths, with wavelength separations of ~1 nm . The resultant temporal characteristics show a substantial modulation owing to the spectral coupling induced by intracavity-generated four-wave mixing. This result may lead to novel methods for directly generating ultrafast subpicosecond optical pulse sequences with spectrally tailored amplitude and phase characteristics from actively mode-locked semiconductor lasers.

10.
Appl Opt ; 36(15): 3375-9, 1997 May 20.
Article in English | MEDLINE | ID: mdl-18253351

ABSTRACT

An ultrafast, hybrid mode-locked semiconductor laser-diode system has been used to seed a flash-lamp-pumped Cr:LiSAF regenerative amplifier system, producing subpicosecond pulses with millijoule output pulse energy. This system has the potential to eliminate argon-ion-pumped-based, ultrafast laser systems.

11.
Opt Lett ; 18(12): 983-5, 1993 Jun 15.
Article in English | MEDLINE | ID: mdl-19823266

ABSTRACT

A Cr:LiSrAIF(6) laser has been mode locked by using a multiple-quantum-well (MQW) absorber. With the MQW absorber inside the laser cavity, Kerr lens mode locking is initiated, yielding transform-limited pulses as short as 93 fs. Pulses of 500-fs duration have also been produced by using resonant passive mode locking with the MQW absorber in an external cavity.

12.
Opt Lett ; 18(22): 1934-6, 1993 Nov 15.
Article in English | MEDLINE | ID: mdl-19829452

ABSTRACT

A diode-pumped mode-locked Cr:LiSAF laser is demonstrated for what is to our knowledge the first time. Active mode locking, with an acousto-optic modulator, and resonant passive mode locking, with a multiple-quantum-well absorber in an external cavity, have both yielded cw trains of picosecond pulses.

13.
Opt Lett ; 17(9): 670-2, 1992 May 01.
Article in English | MEDLINE | ID: mdl-19794593

ABSTRACT

Optical pulses of 200 fs with 165 W of peak power have been generated from an AlGaAs semiconductor diode-laser system. These pulses represent, to our knowledge, both the shortest and most intense ever generated from an all-semiconductor injection diode-laser system. The intracavity pulse evolution in the external cavity is also investigated experimentally. The findings show that the large nonlinearities associated with gain depletion and saturable absorption cause appreciable spectral and temporal modification of the mode-locked optical pulse as it oscillates in the laser cavity.

14.
Opt Lett ; 15(23): 1371-3, 1990 Dec 01.
Article in English | MEDLINE | ID: mdl-19771094

ABSTRACT

Ultrashort optical pulses 0.46 psec in duration with over 70 W of peak power are generated from an all-semiconductor laser-diode system. These results represent to our knowledge both the shortest and most-intense optical pulses generated from an all-semiconductor laser system.

16.
Opt Lett ; 12(12): 1002-4, 1987 Dec 01.
Article in English | MEDLINE | ID: mdl-19741942

ABSTRACT

A novel real-time technique to measure phonon dynamics using the Raman-induced phase-conjugation method in combination with streak-camera technology is described. The technique is used to determine vibrational and optical phonon dephasing kinetics of CS(2), calcite, and LiNbO(3) with a temporal resolution of 3 psec.

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