The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Lianping Hou - One of the best experts on this subject based on the ideXlab platform.
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1 μm distributed feedback laser with low Divergence Angle
Frontiers in Optics, 2020Co-Authors: Lianping Hou, Song Liang, J H MarshAbstract:A DFB laser operating at wavelength of 1 μm has been demonstrated with a small Divergence Angle (17.8° × 25.5°), low threshold current of 16 mA and output power of 37 mW at 90 mA.
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high power algainas inp dfb lasers with low Divergence Angle
European Quantum Electronics Conference, 2019Co-Authors: Yihui Liu, Jiankun Wang, Yongguang Huang, Ruikang Zhang, Hongliang Zhu, Lianping HouAbstract:High-power semiconductor DFB lasers with low Divergence Angle fundamental transverse mode operating at wavelengths near 1.31 μm have many applications such as analog and digital fiber communication, WDM pump sources, spectroscopy, remote sensing, free-space communication, laser-based radar, and wavelength conversion in nonlinear materials [1]. These devices can potentially reduce system costs by simplifying optical alignment and package processes [2]. Devices with narrow far-field patterns (FFPs) are highly desirable for simple, high-yield optical alignment, as a low Divergence Angle improves the coupling efficiency and imposes less stringent tolerances in the alignment between the device and the single-mode fiber (SMF). Until now most of the highpower low Divergence Angle 1.31 μm DFB laser is based on InGaAsP/InP material system which has lower characteristic temperature value T 0 [3]. Here we first demonstrate the high-power fundamental transverse mode 1.31 μm AlGaInAs/InP DFB laser with low Divergence Angle, enabling uncooled continuous-wave (CW) operation at high ambient temperatures.
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160 ghz 1 55 mu rm m colliding pulse mode locked algainas inp laser with high power and low Divergence Angle
IEEE Photonics Technology Letters, 2012Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, A C Bryce, J H MarshAbstract:A monolithic ~1.55-μm colliding-pulse mode-locked AlGaInAs/InP laser with a three-quantum-well active layer incorporating a passive far-held reduction layer has been demonstrated. The device emits pulses at 162 GHz, with a pulsewidth of 0.98 ps, a pulse energy of 0.13 pJ, and a time-bandwidth product of 0.52, while demonstrating a low Divergence Angle (12.7° × 26.3°) with a twofold improvement in butt coupling efficiency to a flat cleaved single-mode fiber, compared to the conventional mode-locked lasers.
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10 ghz algainas inp 1 55 μm passively mode locked laser with low Divergence Angle and timing jitter
European Conference on Optical Communication, 2011Co-Authors: Lianping Hou, J H Marsh, Mohsin Haji, Catrina A BryceAbstract:A novel 10-GHz passively mode-locked AlGaInAs/InP 1.55μm laser was demonstrated with a low Divergence Angle (14.7° × 27.3°), a timing jitter of 194 fs (4–80 MHz), and an RF linewidth of 2 kHz.
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10 ghz algainas inp 1 55 mu m passively mode locked laser with low Divergence Angle and timing jitter
IEEE Photonics Technology Letters, 2011Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, Bocang Qiu, A C Bryce, J H MarshAbstract:We present a 10-GHz 1.55-μm passively mode-locked laser based on a novel AlGalnAs/InP epitaxial structure with a three-quantum-well active layer incorporating a passive far-field reduction layer. The device generated 1.06 ps pulses with a state-of-art timing jitter value of 194 fs (4-80 MHz), and a radio-frequency linewidth of 2 kHz, while demonstrating a low Divergence Angle (14.7° × 27.3°) with a twofold butt coupling efficiency to a flat cleaved single-mode fiber, compared to conventional five-quantum-well mode-locked lasers.
J H Marsh - One of the best experts on this subject based on the ideXlab platform.
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1 μm distributed feedback laser with low Divergence Angle
Frontiers in Optics, 2020Co-Authors: Lianping Hou, Song Liang, J H MarshAbstract:A DFB laser operating at wavelength of 1 μm has been demonstrated with a small Divergence Angle (17.8° × 25.5°), low threshold current of 16 mA and output power of 37 mW at 90 mA.
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160 ghz 1 55 mu rm m colliding pulse mode locked algainas inp laser with high power and low Divergence Angle
IEEE Photonics Technology Letters, 2012Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, A C Bryce, J H MarshAbstract:A monolithic ~1.55-μm colliding-pulse mode-locked AlGaInAs/InP laser with a three-quantum-well active layer incorporating a passive far-held reduction layer has been demonstrated. The device emits pulses at 162 GHz, with a pulsewidth of 0.98 ps, a pulse energy of 0.13 pJ, and a time-bandwidth product of 0.52, while demonstrating a low Divergence Angle (12.7° × 26.3°) with a twofold improvement in butt coupling efficiency to a flat cleaved single-mode fiber, compared to the conventional mode-locked lasers.
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10 ghz algainas inp 1 55 μm passively mode locked laser with low Divergence Angle and timing jitter
European Conference on Optical Communication, 2011Co-Authors: Lianping Hou, J H Marsh, Mohsin Haji, Catrina A BryceAbstract:A novel 10-GHz passively mode-locked AlGaInAs/InP 1.55μm laser was demonstrated with a low Divergence Angle (14.7° × 27.3°), a timing jitter of 194 fs (4–80 MHz), and an RF linewidth of 2 kHz.
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10 ghz algainas inp 1 55 mu m passively mode locked laser with low Divergence Angle and timing jitter
IEEE Photonics Technology Letters, 2011Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, Bocang Qiu, A C Bryce, J H MarshAbstract:We present a 10-GHz 1.55-μm passively mode-locked laser based on a novel AlGalnAs/InP epitaxial structure with a three-quantum-well active layer incorporating a passive far-field reduction layer. The device generated 1.06 ps pulses with a state-of-art timing jitter value of 194 fs (4-80 MHz), and a radio-frequency linewidth of 2 kHz, while demonstrating a low Divergence Angle (14.7° × 27.3°) with a twofold butt coupling efficiency to a flat cleaved single-mode fiber, compared to conventional five-quantum-well mode-locked lasers.
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80 ghz algainas inp 1 55 µm colliding pulse mode locked laser with low Divergence Angle and timing jitter
European Quantum Electronics Conference, 2011Co-Authors: Lianping Hou, J H Marsh, Mohsin Haji, Jehan Akbar, Catrina A BryceAbstract:Colliding-pulse mode-locked lasers (MLLs) offer many advantages compared to other types of MLLs as they provide relatively stable and better pulse-shaped mode-locking operation [1]. Colliding-pulse MLLs (CPM) with narrow far-field patterns are highly desirable for simple and high-yield passive optical alignment, as a low Divergence Angle improves the coupling efficiency and imposes less stringent alignment tolerances between the laser and a single-mode fiber (SMF). However, conventional epi-structure designs result in large beam Divergence Angles and highly asymmetric far-field patterns [2]. A great deal of work has been carried out over the past several years towards the development of spot-size converted lasers to improve the coupling efficiency with SMF. Many of the techniques, such as butt-coupling or lateral-taper-vertical-shift, require etch-and-regrowth over the active region, which is not readily applicable to AlGaInAs/InP-based lasers due to rapid oxidation of exposed Al-containing surfaces [3]. In addition, mode-locked lasers emitting optical pulse trains with low phase noise and timing jitter are also desirable for optical time-division-multiplexed (OTDM) communication systems and optical signal processing. The timing jitter of passive CPM operation can be reduced either by lowering the internal loss of the cavity or by increasing the saturation energy (E sat ) of the gain section [4]. To obtain a high E sat in the gain section, one should try to use either a low optical confinement factor (Γ) or a large spot size (A), i.e. maximize A/Γ. E sat can also be improved by decreasing the differential gain (dg/dN), which can be achieved by reducing the number of quantum wells (QWs) in the gain medium.
Mohsin Haji - One of the best experts on this subject based on the ideXlab platform.
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160 ghz 1 55 mu rm m colliding pulse mode locked algainas inp laser with high power and low Divergence Angle
IEEE Photonics Technology Letters, 2012Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, A C Bryce, J H MarshAbstract:A monolithic ~1.55-μm colliding-pulse mode-locked AlGaInAs/InP laser with a three-quantum-well active layer incorporating a passive far-held reduction layer has been demonstrated. The device emits pulses at 162 GHz, with a pulsewidth of 0.98 ps, a pulse energy of 0.13 pJ, and a time-bandwidth product of 0.52, while demonstrating a low Divergence Angle (12.7° × 26.3°) with a twofold improvement in butt coupling efficiency to a flat cleaved single-mode fiber, compared to the conventional mode-locked lasers.
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10 ghz algainas inp 1 55 μm passively mode locked laser with low Divergence Angle and timing jitter
European Conference on Optical Communication, 2011Co-Authors: Lianping Hou, J H Marsh, Mohsin Haji, Catrina A BryceAbstract:A novel 10-GHz passively mode-locked AlGaInAs/InP 1.55μm laser was demonstrated with a low Divergence Angle (14.7° × 27.3°), a timing jitter of 194 fs (4–80 MHz), and an RF linewidth of 2 kHz.
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10 ghz algainas inp 1 55 mu m passively mode locked laser with low Divergence Angle and timing jitter
IEEE Photonics Technology Letters, 2011Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, Bocang Qiu, A C Bryce, J H MarshAbstract:We present a 10-GHz 1.55-μm passively mode-locked laser based on a novel AlGalnAs/InP epitaxial structure with a three-quantum-well active layer incorporating a passive far-field reduction layer. The device generated 1.06 ps pulses with a state-of-art timing jitter value of 194 fs (4-80 MHz), and a radio-frequency linewidth of 2 kHz, while demonstrating a low Divergence Angle (14.7° × 27.3°) with a twofold butt coupling efficiency to a flat cleaved single-mode fiber, compared to conventional five-quantum-well mode-locked lasers.
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80 ghz algainas inp 1 55 µm colliding pulse mode locked laser with low Divergence Angle and timing jitter
European Quantum Electronics Conference, 2011Co-Authors: Lianping Hou, J H Marsh, Mohsin Haji, Jehan Akbar, Catrina A BryceAbstract:Colliding-pulse mode-locked lasers (MLLs) offer many advantages compared to other types of MLLs as they provide relatively stable and better pulse-shaped mode-locking operation [1]. Colliding-pulse MLLs (CPM) with narrow far-field patterns are highly desirable for simple and high-yield passive optical alignment, as a low Divergence Angle improves the coupling efficiency and imposes less stringent alignment tolerances between the laser and a single-mode fiber (SMF). However, conventional epi-structure designs result in large beam Divergence Angles and highly asymmetric far-field patterns [2]. A great deal of work has been carried out over the past several years towards the development of spot-size converted lasers to improve the coupling efficiency with SMF. Many of the techniques, such as butt-coupling or lateral-taper-vertical-shift, require etch-and-regrowth over the active region, which is not readily applicable to AlGaInAs/InP-based lasers due to rapid oxidation of exposed Al-containing surfaces [3]. In addition, mode-locked lasers emitting optical pulse trains with low phase noise and timing jitter are also desirable for optical time-division-multiplexed (OTDM) communication systems and optical signal processing. The timing jitter of passive CPM operation can be reduced either by lowering the internal loss of the cavity or by increasing the saturation energy (E sat ) of the gain section [4]. To obtain a high E sat in the gain section, one should try to use either a low optical confinement factor (Γ) or a large spot size (A), i.e. maximize A/Γ. E sat can also be improved by decreasing the differential gain (dg/dN), which can be achieved by reducing the number of quantum wells (QWs) in the gain medium.
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low Divergence Angle and low jitter 40 ghz algainas inp 155 μm mode locked lasers
Optics Letters, 2011Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, Bocang Qiu, Catrina A BryceAbstract:We demonstrate a novel (to the best of our knowledge) 40 GHz passively mode-locked AlGaInAs/InP 1.55 μm laser with a low Divergence Angle (12.7°×26.3°), timing jitter of 1.2 ps (10 kHz–100 MHz), and a radio frequency linewidth of 25 kHz.
Jehan Akbar - One of the best experts on this subject based on the ideXlab platform.
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160 ghz 1 55 mu rm m colliding pulse mode locked algainas inp laser with high power and low Divergence Angle
IEEE Photonics Technology Letters, 2012Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, A C Bryce, J H MarshAbstract:A monolithic ~1.55-μm colliding-pulse mode-locked AlGaInAs/InP laser with a three-quantum-well active layer incorporating a passive far-held reduction layer has been demonstrated. The device emits pulses at 162 GHz, with a pulsewidth of 0.98 ps, a pulse energy of 0.13 pJ, and a time-bandwidth product of 0.52, while demonstrating a low Divergence Angle (12.7° × 26.3°) with a twofold improvement in butt coupling efficiency to a flat cleaved single-mode fiber, compared to the conventional mode-locked lasers.
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10 ghz algainas inp 1 55 mu m passively mode locked laser with low Divergence Angle and timing jitter
IEEE Photonics Technology Letters, 2011Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, Bocang Qiu, A C Bryce, J H MarshAbstract:We present a 10-GHz 1.55-μm passively mode-locked laser based on a novel AlGalnAs/InP epitaxial structure with a three-quantum-well active layer incorporating a passive far-field reduction layer. The device generated 1.06 ps pulses with a state-of-art timing jitter value of 194 fs (4-80 MHz), and a radio-frequency linewidth of 2 kHz, while demonstrating a low Divergence Angle (14.7° × 27.3°) with a twofold butt coupling efficiency to a flat cleaved single-mode fiber, compared to conventional five-quantum-well mode-locked lasers.
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80 ghz algainas inp 1 55 µm colliding pulse mode locked laser with low Divergence Angle and timing jitter
European Quantum Electronics Conference, 2011Co-Authors: Lianping Hou, J H Marsh, Mohsin Haji, Jehan Akbar, Catrina A BryceAbstract:Colliding-pulse mode-locked lasers (MLLs) offer many advantages compared to other types of MLLs as they provide relatively stable and better pulse-shaped mode-locking operation [1]. Colliding-pulse MLLs (CPM) with narrow far-field patterns are highly desirable for simple and high-yield passive optical alignment, as a low Divergence Angle improves the coupling efficiency and imposes less stringent alignment tolerances between the laser and a single-mode fiber (SMF). However, conventional epi-structure designs result in large beam Divergence Angles and highly asymmetric far-field patterns [2]. A great deal of work has been carried out over the past several years towards the development of spot-size converted lasers to improve the coupling efficiency with SMF. Many of the techniques, such as butt-coupling or lateral-taper-vertical-shift, require etch-and-regrowth over the active region, which is not readily applicable to AlGaInAs/InP-based lasers due to rapid oxidation of exposed Al-containing surfaces [3]. In addition, mode-locked lasers emitting optical pulse trains with low phase noise and timing jitter are also desirable for optical time-division-multiplexed (OTDM) communication systems and optical signal processing. The timing jitter of passive CPM operation can be reduced either by lowering the internal loss of the cavity or by increasing the saturation energy (E sat ) of the gain section [4]. To obtain a high E sat in the gain section, one should try to use either a low optical confinement factor (Γ) or a large spot size (A), i.e. maximize A/Γ. E sat can also be improved by decreasing the differential gain (dg/dN), which can be achieved by reducing the number of quantum wells (QWs) in the gain medium.
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low Divergence Angle and low jitter 40 ghz algainas inp 155 μm mode locked lasers
Optics Letters, 2011Co-Authors: Lianping Hou, Mohsin Haji, Jehan Akbar, Bocang Qiu, Catrina A BryceAbstract:We demonstrate a novel (to the best of our knowledge) 40 GHz passively mode-locked AlGaInAs/InP 1.55 μm laser with a low Divergence Angle (12.7°×26.3°), timing jitter of 1.2 ps (10 kHz–100 MHz), and a radio frequency linewidth of 25 kHz.
G Trankle - One of the best experts on this subject based on the ideXlab platform.
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1060 nm ridge waveguide lasers based on extremely wide waveguides for 1 3 w continuous wave emission into a single mode with fwhm Divergence Angle of 9 circ times 6 circ
IEEE Journal of Quantum Electronics, 2012Co-Authors: A Pietrzak, H Wenzel, P Crump, F Bugge, Jorg Fricke, M Spreemann, G Erbert, G TrankleAbstract:Extremely large epitaxial waveguides with thickness tWG = 8.6 μm enable diode lasers with very narrow vertical Divergence Angle. We demonstrate that when such designs are processed in ridge waveguide laser format, there is substantial interaction between the vertical and lateral waveguiding mechanisms. For very narrow stripes with width w ≪ tWG, such interaction leads to lasing operation in the second-order mode in the vertical direction. For the case of an optimal stripe width w~tWG single fundamental mode operation is achieved, with peak kink-free optical output power of 1.3 W and beam Divergence Angles (vertical, lateral) of 9° × 6° at full-width at half-maximum and 17° × 13° with 95% power content. The maximum brightness is 90 MW × cm-2 sr-1 for 95% power content.
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high power 1060 nm ridge waveguide lasers with low index quantum barriers for narrow Divergence Angle
Conference on Lasers and Electro-Optics, 2010Co-Authors: Agnieszka Pietrzak, H Wenzel, P Crump, F Bugge, G Erbert, G TrankleAbstract:Combining low-index quantum-barriers with thick (8.6 µm) waveguide in a multi-QW 1060-nm epi-structure enabled a vertical Divergence of <9°. 30 W broad-area and 0.8 W single-transverse-mode operation ridge-waveguide devices are demonstrated using these vertical designs.
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high power laser diodes emitting light above 1100 nm with a small vertical Divergence Angle of 13
Optics Letters, 2008Co-Authors: Agnieszka Pietrzak, H Wenzel, G Erbert, G TrankleAbstract:Laser diodes with highly strained InGaAs quantum wells, emitting at 1130 nm, embedded in a GaAs waveguide were investigated. This Letter reviews the design of the vertical structure for enclosing high output power in Angles smaller than 18°. Example designs were processed to 200 μm stripe-width lasers with an 8-mm-long optical cavity. When these are mounted on C mounts, they give an output power of 38 W under quasi-cw operation from a single emitter.