• Title, Summary, Keyword: Vertical cavity surface emitting laser

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High Power and Single Mode Lasing Characteristics in Vertical Cavity Surface Emitting Laser by Varying Photonic Bandgap Structures (광 결정 구조 변수에 따른 고출력 단일모드 수직공진 표면발광 레이저의 발진 특성)

  • Lee, Jin-Woong;Hyun, Kyung-Sook;Shin, Hyun-Ee;Kim, Hee-Dae
    • Korean Journal of Optics and Photonics
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    • v.20 no.6
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    • pp.339-345
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    • 2009
  • The high power and single mode vertical cavity surface emitting laser(VCSEL)s with photonic crystal structures have been proposed and fabricated by reducing substantially the hole numbers used in the photonic crystal structures. It is found that only six holes enable VCSELs to operate a single mode and the reliability can be enhanced by filling the holes with polyimide. The single mode lasing characteristics were analyzed by varying the oxide aperture and the hole diameter in photonic crystal structures. As a result, the single mode lasing can be stably obtained in the photonic crystal vertical cavity surface emitting lasers.

Modelling the Mode Behavior of Circular Vertical-Cavity Surface-Emitting Laser

  • Ho, Kwang-Chun
    • International Journal of Internet, Broadcasting and Communication
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    • v.4 no.2
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    • pp.22-27
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    • 2012
  • The design characteristics of circular vertical-cavity surface-emitting lasers are studied by using a newly developed equivalent network. Optical parameters, such as the stop-band or the reflectivity of periodic mirrors and the resonance wavelength, are explored for the design of these structures. To evaluate the differential quantum efficiency and the threshold current density, a transverse resonance condition of modal transmission-line theory is also utilized. This approach dramatically reduces the computational time as well as gives an explicit insight to explore the optical characteristics of circular vertical-cavity surface-emitting lasers (VCSELs).

Estimating the Thickness Errors in Vertical-Cavity Surface-Emitting Laser Structures from Optical Reflection spectra (반사 스펙트럼을 이용한 VCSEL 에피층의 두께 오차 평가)

  • 김남길;김상배
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.40 no.8
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    • pp.572-579
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    • 2003
  • By comparing the measured optical reflection spectra with calculated one by the transfer-matrix method (TMM) in epitaxial wafers for vertical-cavity surface-emitting lasers (VCSELs), we have estimated the systematic thickness errors in a simple and nondestructive way. The experimentally confirmed technique is based on the finding that the shape of the reflection spectra depends mainly on a newly defined single parameter, the effective error in the n-mirror layers, and the thickness error in the active cavity simply shifts the Fabry-Perot resonance wavelength. Also shown is that the proposed method is reliable when the relative standard deviation of the random thickness errors is less than 0.005. Because reflection spectra are routinely measured, we can easily estimate the thickness errors nondestructively with high spatial resolution.

Design of 850 nm Vertical-Cavity Surface-Emitting Lasers by Using a Transfer Matrix Method (전달 행렬 방법을 이용한 850 nm수직 공진기 레이저 구조의 최적설계)

  • Kim Tae-Yong;Kim Sang-Bae
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.1
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    • pp.35-46
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    • 2004
  • In comparison with edge-emitting lasers(EELs), predicting the output power and slope efficiency of Vertical-Cavity Surface-Emitting Lasers(VCSELs) is very difficult due to the absorption loss in DBR layers. However, by using transfer matrix method(TMM), we've made possible to calculate such parameters of multi-layer structures like VCSELs. In this paper, we've calculated the threshold gain, threshold current and slope efficiency through the methodology based on TMM. Also TMM is the way of customizing the VCSEL structure for the desired threshold current and slope efficiency by changing the number of DBR mirror layers.

Bidirectional Hybrid DWDM-PON for HDTV/Gigabit Ethernet/CATV Applications

  • Lu, Hai-Han;Tsai, Wen-Shing;Chien, Tzu-Shen;Chen, Shih-Hung;Chi, Yu-Chieh;Liao, Che-Wei
    • ETRI Journal
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    • v.29 no.2
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    • pp.162-168
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    • 2007
  • A new scheme for bi-directional HDTV/Gigabit Ethernet/CATV transmission over a hybrid dense-wavelength-division-multiplexing passive optical network (DWDM-PON) is proposed and demonstrated. It is based on injection-locked vertical-cavity surface-emitting lasers and distributed-feedback laser diodes as transmitters. Services with 129 HDTV channels, a 1.25 Gbps Gigabit Ethernet connection, and 77 CATV channels are successfully demonstrated over 40 km single-mode fiber links. Good performance of bit error rate, carrier-to-noise ratio, composite second order, and composite triple beat is achieved in our proposed bidirectional DWDM-PON.

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Photo-pumped $1.3\;{\mu}m$ vertical-cavity surface-emitting lasers (광펌핑하여 $1.3\;{\mu}m$파장에서 동작하는 수직공진 표면광 레이저)

  • 송현우;김창규;이용희
    • Korean Journal of Optics and Photonics
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    • v.8 no.2
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    • pp.111-115
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    • 1997
  • Vertical-cavity surface-emitting laser(VCSEL)s operating at 1.3-micron wavelength for optical communication are fabricated by using Si/SiO$_2$dielectric quater-wave pairs on both sides of the InGaAsP(${\lambda}_g$=1.3 ${\mu}{\textrm}{m}$) gain material. VCSELs are optically pumped with a Nd-YAG laser in a pulsed mode and lasing around 1.3 microns is observed. Lasing characteristics such as threshold pump intensity as a function of mirror-reflectivity, polarization, and threshold pump density with pump spot size are investigated.

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Development of UV molding Process to Integrate Microlens Array on VCSEL Array for Optical Communication (광통신 용 VCSEL Array상에 Microlens Array를 집적하기 위한 UV성형 공정기술 개발)

  • 한정원;김석민;김홍민;이지승;임지석;강신일
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.840-843
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    • 2004
  • UV molding is a process for integrating micro/nano polymeric optical components on optoelectronic modules. In the present study, a microlens array for vertical cavity surface emitting laser(VCSEL) to fiber coupling was designed, integrated and tested. At the design stage, design variables ware optimized to maximize the coupling efficiency, and tolerance analysis was carried out. At the integration stage, the UV transparent mold was fabricated and the microlens array on VCSEL array was integrated by UV molding process. Finally the coupling efficiency of VCSEL to fiber was measured and analyzed.

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Degradation Behavior of 850 nm AlGaAs/GaAs Oxide VCSELs Suffered from Electrostatic Discharge

  • Kim, Tae-Yong;Kim, Tae-Ki;Kim, Sang-In;Kim, Sang-Bae
    • ETRI Journal
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    • v.30 no.6
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    • pp.833-843
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    • 2008
  • The effect of forward and reverse electrostatic discharge (ESD) on the electro-optical characteristics of oxide vertical-cavity surface-emitting lasers is investigated using a human body model for the purpose of understanding degradation behavior. Forward ESD-induced degradation is complicated, showing three degradation phases depending on ESD voltage, while reverse ESD-induced degradation is relatively simple, exhibiting two phases of degradation divided by a sudden distinctive change in electro-optical characteristics. We demonstrate that the increase in the threshold current is mainly due to the increase in leakage current, nonradiative recombination current, and optical loss. The decrease in the slope efficiency is mainly due to the increase in optical loss.

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