Patent
Oscillation polarization mode selective semiconductor laser, modulation method therefor and optical communication system using the same
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TLDR
In this paper, the laser structure is designed such that light in both of two polarization modes can be excited therein, and at least one of them is a distributed reflector which determines first and second reflection wavelengths for the two modes.Abstract:
A semiconductor laser includes a semiconductor laser structure having an active layer. The laser structure is designed such that light in both of two polarization modes can be excited therein. First and second reflectors are provided, and at least one of them is a distributed reflector which determines first and second reflection wavelengths for the two polarization modes. A coupling unit is provided for coupling the laser structure and the first and second reflectors for either of the light of the two polarization modes at first and second coupling wavelengths, which respectively coincide with the first and second reflection wavelengths. One of the light of the two polarization modes at the first and second reflection wavelengths is selectively propagated along a cavity comprised of the laser structure and the first and second reflectors by a control unit. Thus, light oscillates in one of the two polarization modes at the first and second reflection wavelengths.read more
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Semiconductor laser device, method for driving the same, and optical communication system using the same
TL;DR: In this article, the first light guide layer is formed such that coupling states, in which the light waves in the two different polarization modes are respectively coupled to the active layer and the first guide layer, can be changed independently from each other by controlling one of the current and the voltage supplied by the control unit.
Patent
Polarization mode selection by distributed Bragg reflector in a quantum well laser
TL;DR: In this paper, a distributed Bragg reflector is used to select the polarization mode of the emitted light beam, which matches the peak gain of one polarization mode providing optical feedback for that mode to be the light emitted.
Patent
Versatile method and system for single mode vcsels
TL;DR: In this article, a single mode VCSEL (vertical cavity surface emitting laser) component is proposed, which consists of a semiconductor substrate having a lower surface and an upper surface, a bottom electrical contact disposed along the lower surface of the substrate, a lower mirror formed of n-type material and disposed upon the upper surface of a substrate, an active region (108) having a plurality of quantum wells disposed upon lower mirror portion, an upper mirror (110) formed from isotropic material, and an equipotential layer (112) disposed upon upper mirror portion
Patent
Polarization control using diffraction gratings in VCSEL waveguide grating couplers
TL;DR: In this article, a VCSEL waveguide grating coupler is provided such that a first and second mirror are positioned to define a resonant cavity between them, and a waveguide having a first grating formed as a part of the waveguide to couple light of a first polarization mode into waveguide.
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Long wavelength VCSEL device processing
TL;DR: In this paper, a process for making a laser structure is described, which involves dielectric and spin-on material planarization over wide and narrow trenches, coplanar contacts, non-coplanar contact, thick and thin pad dielectrics, air bridges and wafer thinning.
References
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Patent
Polarization-dependent and polarization-diversified opto-electronic devices using a strained quantum well
Kwok Wai Cheung,Chung-En Zah +1 more
TL;DR: In this article, a polarization diversity detector is proposed to detect the non-absorbed light of the other polarizations of the light, which can be used to form a simple optical disk pickup head or an array of pickup heads.
Patent
Optical apparatus using wavelength selective photocoupler
Hajime Sakata,Hidetoshi Nojiri +1 more
TL;DR: In this paper, a diffraction grating is used to couple two waveguides through a diffusion grating, which couples light components of a specific wavelength range of light propagating through the first waveguide to the second waveguide layer, and an electrode for converting the light components absorbed by the light absorption layer into an electrical signal.
Journal ArticleDOI
Codirectionally coupled twin-guide laser diode for broadband electronic wavelength tuning
TL;DR: In this paper, a novel broadband tunable laser diode is presented, which is based on a codirectional coupling scheme which is predicted to yield tuning ranges larger than 50 nm.
Journal ArticleDOI
Broadly tunable vertical‐coupler filtered tensile‐strained InGaAs/InGaAsP multiple quantum well laser
I. Kim,R. C. Alferness,Uziel Koren,L. L. Buhl,Barry Miller,M. G. Young,M. Chien,Thomas L. Koch,H. M. Presby,G. Raybon,C. A. Burrus +10 more
TL;DR: Using tensile-strained InGaAs/InGaAsP multiple quantum well material to increase the gain bandwidth, this paper demonstrated a tuning range of 74.4 nm with sidemode-suppression ratio of ≳25 dB and as high as 34 dB in a broadly tunable vertical-coupler filtered laser at 1.55 μm.
Patent
Polarization mode switching semiconductor laser apparatus
TL;DR: In this article, a semiconductor laser apparatus includes a first cladding layer, an active layer, a second claddings layer, and a second electrode, which is placed in a waveguide direction perpendicular to the surfaces of the semiconductor substrate to oppose each other.