Search query: optical fiber coupiing semiconductor lasers

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abstract: Using a fiber optic temperature sensing system based on the cross correlation of picosecond optical pulses from a gain switched semiconductor laser, the thermal time constants of several types of optical fiber in water were measured.
author_names: Kazunari Tokunaga

Yoshitaka Naito

Tetsuya Matsuyama
title: Measurement of thermal time constant of optical fiber using linear cross correlation of optical pulses
venue: 2020 Conference on Lasers and Electro Optics Pacific Rim (CLEO PR)
year: 2020

abstract: Coherent optical frequency comb based on single section semiconductor quantum dots mode locked laser (QD MLL) is a promising device, which is able to provide a large number of equally spaced spectral lines simultaneously. We discuss the measurements and the spectral properties of QD MLL, including relative intensity noise, phase noise of each individual spectral line, as well as differential phase noise between spectral lines. More specifically, we report the frequency dependent nature of QD MLL phase noises, and its impact in the performance of coherent communication systems.
author_names: Rongqing Hui

Mustafa Al-Qadi

M O'sullivan

Chongjin Xie
title: Spectral Properties of Quantum Dots Mode Locked Diode Lasers and the Impact in Fiber Optic Systems
venue: 2020 22nd International Conference on Transparent Optical Networks (ICTON)
year: 2020

abstract: Surface trapped electromagnetic waves can be localized at a boundary between a semiconductor distributed Bragg reflector (DBR) and the air. These waves enable a novel class of both in plane emitting and vertically emitting optical devices including edge emitting lasers, disk microlasers, near field fiber coupled lasers as well as vertical cavity surface emitting lasers (VCSELs) In oxide confined VCSEL structures the surface trapped mode can be used for engineering of coupled modes in the oxidized periphery region outside the aperture having a large overlap integral with the VCSEL modes inside the aperture region. Depending on the thickness of the distributed Bragg reflector layers, the thickness of the oxide layers and of the design of the top VCSEL cap layers, the interaction of these non orthogonal optical modes can result in the lateral leakage of the VCSEL emission into the oxidized periphery. High order transverse VCSEL aperture modes having a higher intensity at the aperture boundary can have preference for such leakage. Mapping of the VCSEL wafers in areas with the variable aperture diameters $D(\sim 3\ \mu \mathrm{m} \text{to} \sim 5\ \mu \mathrm{m} shows non monotonous behavior of side mode suppression ratio (SMRS) between the fundamental and the excited mode versus $D$ oscillating in the range from 7 dB to ~30 dB with three clearly revealed maxima in the SMSR at particular aperture diameters. VCSELs manufactured show 40 Gb/s data transmission over 1.4 km OM5 multimode fiber without pre emphasis or equalization.
author_names: Nikolay N Ledentsov

Vitaly A Shchukin

Vladimir Kalosha

Lukasz Chorchos

Oleg Makarov
title: Edge and Surface Emitting Lasers Applying TM Mode Confined at the Distributed Bragg Reflector Air Interface
venue: 2020 22nd International Conference on Transparent Optical Networks (ICTON)
year: 2020

abstract: This paper introduces an integrated fiber physical unclonable function (PUF) verification system based on a semiconductor laser source at substantially lower complexity and cost than existing alternatives. A source sub section consisting of a linear frequency swept semiconductor laser is used in combination with an optical frequency domain reflectometry (OFDR)/LiDAR based measurement sub section in order to conduct fiber identification via measurement of the unique Rayleigh reflection pattern of a section of optical fiber. When using these Rayleigh reflection patterns as PUFs, this technique results in a maximum equal error rate (EER) of 0.15% for a 5 cm section of optical fiber and an EER of less than 1% for a 4 cm section. These results demonstrate that the system can serve as a robust method fiber identification for device and communication verification applications.
author_names: Zheyi Yao

Thomas Mauldin

Gerald Hefferman

Zheyu Xu

Ming Liu

Tao Wei
title: Low cost optical fiber physical unclonable function reader based on a digitally integrated semiconductor LiDAR.
venue: Applied optics
year: 2019

abstract: A novel scheme for all optical generate ultra wideband (UWB) pulse shape modulation (PSM) signals based on semiconductor fiber ring laser (SFRL) is proposed, in which three UWB PSM signals can be generated simultaneously. A comprehensive broad band dynamic model of this kind of all optical UWB PSM signals is presented and simulated. The numerical simulation results show that the central frequency (CF) of PSM signals, the 10dB bandwidth of PSM signals and the fractional bandwidth of PSM signals are 5GHz, 7GHz and 140% respectively, which satisfy the definition of the UWB.
author_names: Zan-shan Zhao
title: Research of all optical broadcast UWB pulse shape modulation signals based on semiconductor fiber ring laser
venue: 2019 18th International Conference on Optical Communications and Networks (ICOCN)
year: 2019

abstract: Monolithic passively mode locked (PML) semiconductor lasers are attractive high speed photonic emitters potentially enabling novel future secure communication schemes [1] In this contribution, mutual all optical injection of two PML InAs/InGaAs quantum dot (QD) lasers emitting at 1250 nm with equal active region and waveguide geometry is studied experimentally for the first time and explained theoretically. The active regions of both two section lasers consist of 5 layers of InAs/InGaAs QDs, and the emission wavelengths are at around 1255 nm. Both cavity lengths amount to 2 mm with a 0.25 mm long absorber section at the back facet that is reverse biased at 4 V. The facets are anti reflective (front facet) and high reflective (back facet) coated. The lasers are stabilized at different heat sink temperatures (Laser 1: 15 degC, Laser 2: 24 degC) to ensure optimum wavelength overlap. Both lasers are mutually coupled by a setup, depicted schematically in Fig. 1a) Emission beams of both lasers are individually collimated and overlapped across a distance of approximately 1.65 m. Optical fine delay is implemented by a retro reflector mounted on a linear translation stage. Using a 50/50 beam splitter and incorporating two optical isolators >60 dB isolation) light from both directions can be fiber coupled and by an optical spectrum analyzer and a fast photo diode in combination with an electrical spectrum analyzer, spectral and radio frequency (RF) analysis can be performed. Both lasers are biased at 200 mA and the free running repetition rate (RR) amounts to 20.074 GHz for Laser 1 and 20.087 GHz for Laser 2. We translate the single path fine delay across 66 ps in steps of 1.47 ps and record both lasers repetition rates RR for the mutually injection scheme. Obtained results are depicted in Fig. 1b) as a function of the added time delay. We find that both RRs follow a saw tooth shaped dependence with plateaus which is attributed to the strong external optical self feedback stemming from the facets of the opposite laser [1] Furthermore, the well overlapping RRs of both lasers in Fig. 1b) indicate mutual injection locking, as analyzed in [2] In a second step, both lasers RRs are analyzed in dependence on the gain section biasing of Laser 1 of 100 mA to 250 mA in steps of 5 mA. Fig. 1c) displays the recorded RRs under mutual injection with Laser 2 biased at 200 mA. Additionally, we measure both RRs with the opposite laser unbiased in order to identify the influence of the OFB without the presence of the mutual injection signals (black and green curve in Fig 1c)
author_names: Christoph Weber

Dominik Auth

Iraklis Hercules Simos

Christos Simos

Stefan Breuer
title: Repetition Rate Locking of Mutually Injected Monolithic Passively Mode Locked Semiconductor Quantum Dot Lasers
venue: 2019 Conference on Lasers and Electro Optics Europe European Quantum Electronics Conference (CLEO/Europe EQEC)
year: 2019

abstract: Self mode locked (SML) quantum dash (QDh) lasers emitting at around 1550 nm are compact broadband optical frequency comb (OFC) sources for multi wavelength communication applications [1,2] Optical self feedback (OFB) by auxiliary cavities with lengths in the meter range is a well established method for a precise and dynamical mode spacing control of passively mode locked (PML) semiconductor lasers. Recent works focused on identifying maximum tuning ranges of quantum well PML lasers and suggested that external OFB length, interaction width of fed back pulse with the pulse inside the laser cavity and the OFB strength appear predominant [3] In this contribution, we experimentally investigate and explain by modeling the dependence of mode spacing of OFB of SML QDh lasers subject to different cavity lengths on the external optical delay. Here, we study the impact of different OFB strengths and external OFB cavity lengths onto the mode spacing of QDh SML lasers. The three lasers investigated are 1 mm and 2 mm long, corresponding to a mode spacing of 40 GHz and 20 GHz, base on 6 and 9 layers of InAs/InGaAsP Qdhs [1,4] and exhibit as cleaved facets. In the developed experimental set up, sketched in Fig. 1a) the laser light is coupled into a lensed single mode fiber and a part of the light is directed to the hybrid fiber based and free space OFB cavity.
author_names: Patrick Fiala

Dominik Auth

Christoph Weber

Quentin Gaimard

Abderrahim Ramdane

Stefan Breuer
title: Self Injected Optical Frequency Comb Quantum Dash Lasers
venue: 2019 Conference on Lasers and Electro Optics Europe European Quantum Electronics Conference (CLEO/Europe EQEC)
year: 2019

abstract: Dual mode microcavity semiconductor lasers are investigated for potential applications in photonic microwave and optical frequency comb (OFC) generation. By regulating whispering gallery modes (WGMs) in square microcavities, dual mode lasing is achieved with frequency intervals ranging from tens to hundreds of gigahertz. In the square microcavities, the fundamental and first order transverse WGMs have spatially separated field distributions, which allow stable dual transverse mode lasing with mode intervals inversely proportional to the cavity areas. Dual transverse mode square microcavity lasers are experimentally demonstrated with frequency intervals ranging from ~35 to ~150 GHz. Photonic microwaves and OFCs are successfully generated based on the dual mode square microcavity lasers. To enhance the transverse mode intervals, circular side square microcavity lasers with a square hole in the center are proposed and demonstrated, and dual transverse mode lasing with a frequency interval up to ~0.56 THz is obtained. Furthermore, a square Fabry Perot coupled cavity microlaser is demonstrated to increase the output power and introduce an additional degree for manipulating the lasing modes. Dual mode lasing is realized with a frequency interval of ~0.5 THz, a single mode optical fiber coupled power of ~3 mW, and a wavelength tuning range of ~10 nm.
author_names: Hai-Zhong Weng

Yuede Yang

Ji-Liang Wu

You-Zeng Hao

Ming-Ying Tang

Jin-Long Xiao

Yongzhen Huang
title: Dual Mode Microcavity Semiconductor Lasers
venue: IEEE Journal of Selected Topics in Quantum Electronics
year: 2019

abstract: Optical chaos communication has advantages of high speed and long transmission distance. Unfortunately, the key space of the traditional transceiver, i.e. semiconductor laser with mirror feedback, is limited due to the time delay signature. In this paper, we propose and numerically demonstrate a key space enhancement by using semiconductor laser with optical feedback from a chirped fiber Bragg grating (FBG) The chirped FBG feedback can make feedback delay a key parameter by eliminating the time delay signature. Moreover, the grating dispersion and center frequency can also be used as new keys. As a result, the dimension of key space is increased. By taking a bidirectional communication scheme as an example, numerical results show that the key space is raised by 244 times as against mirror feedback with a data rate of 2.5 Gb/s and a coupling strength of 0.447. As the coupling strength decreases, the key space increases due to the fact that chaos synchronization becomes more sensitive to parameter mismatch.
author_names: Da Wang

Louis S Wang

Y Y Guo

Yu Cheng Wang

A B Wang
title: Key space enhancement of optical chaos secure communication: chirped FBG feedback semiconductor laser.
venue: Optics express
year: 2019

abstract: Extended cavity semiconductor lasers with high spectral purity and wide spectral coverage are important for a large range of applications including fiber optic communications [1] optical sensing [2] or applications in space, for instance in atomic clocks [3] Monolithic diode lasers for such tasks, e.g. distributed feedback (DFB) lasers and distributed Bragg reflector (DBR) lasers, approach their limits since they typically show either a small tuning range [4] or considerable spectral linewidths at the MHz level [5] These limitations can be largely removed in hybrid lasers, where the gain from a semiconductor optical amplifier chip is receiving spectrally filtered feedback from a second chip fabricated from dielectric material. The dielectric chip carries an integrated optical waveguide circuit with which highly selective filtering and a long photon lifetime can be realized beyond what is typically possible in semiconductor platforms.
author_names: Y Fan

Jesse Mak

Albert van Rees

Edwin Jan Klein

K -J Bolter
title: Extended Cavity Single Frequency Semiconductor Lasers using Ring Filters in Low Loss SiN Technology
venue: 2018 IEEE International Semiconductor Laser Conference (ISLC)
year: 2018