Simulation studies on polarization modulated vertical cavity surface emitting laser for combined fiber and free space optical links

Krishna, K. Murali; Madhan, M. Ganesh; Ashok, P.

doi:10.1016/j.ijleo.2020.165018

Cited by 20 publications

(3 citation statements)

References 21 publications

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“…The spin-flip model [32] has been used for analyzing novel features of spin-VCSELs [33][34][35][36][37][38]. We used the following spin-flip rate equations, including an external light injection for simulating injection-locked spin-VCSELs and frequency-shifted LOs in coherent optical communication systems:…”

Section: Simulation Modelmentioning

confidence: 99%

Spin Laser Local Oscillators for Homodyne Detection in Coherent Optical Communications

Yokota

Yasaka

2021

Micromachines

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We numerically investigate spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) for local oscillators, which are based on an injection locking technique used in coherent optical communications. Under the spin polarization modulation of an injection-locked spin-VCSEL, frequency-shifted and phase-correlated optical sidebands are generated with an orthogonal polarization against the injection light, and one of the sidebands is resonantly enhanced due to the linear birefringence in the spin-VCSEL. We determine that the peak strength and peak frequency in the spin polarization modulation sensitivity of the injection-locked spin-VCSEL depend on detuning frequency and injection ratio conditions. As a proof of concept, 25-Gbaud and 16-ary quadrature amplitude modulation optical data signals and a pilot tone are generated, and the pilot tone is used for the injection locking of a spin-VCSEL. An orthogonally-polarized modulation sideband generated from the injection-locked spin-VCSEL is used as a frequency-shifted local oscillator (LO). We verify that the frequency-shifted LO can be used for the homodyne detection of optical data signals with no degradation. Our findings suggest a novel application of spin-VCSELs for coherent optical communications.

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Section: Simulation Modelmentioning

confidence: 99%

Spin Laser Local Oscillators for Homodyne Detection in Coherent Optical Communications

Yokota

Yasaka

2021

Micromachines

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“…Gain switching based applications of QCL are well documented in [5][6][7]. Free Spaced Optics based applications of QCL are simulated and analyzed in [8][9][10][11][12]. Impedance characteristics have been well documented for QCLs and semiconductor laser diodes [8,13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Temperature dependent Impedance Characteristics of Far-Infrared Quantum Cascade Lasers

Ashok

Madhan²,

Gopinath³

et al. 2023

J. Phys.: Conf. Ser.

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Quantum Cascade Lasers (QCLs) as Terahertz (THz) frequency sources offer a potentially viable solution for new applications in mid and far-infrared frequency bands. This research work exhaustively investigates the temperature dependence on the impedance of temperature dependent Quantum Cascade Lasers (QCLs) operating at 116μm, for the first time. In the 90-stage QCL considered for the work, the cold finger temperature is varied from 15K to 45K. When the device is biased at 0.6A current along with a cold finger temperature of 45K, the magnitude of intrinsic impedance was found to be 23.91mΩ, at a frequency of 4GHz. As the cold finger temperature is increased from 15K to 45K, the impedance response of the device becomes flat and stays constant. At 45K with an injected current of 1.5A, maximum impedance of 3.1mΩ is obtained. The resonant frequency characteristics of the device increase with increase in injected current and cold finger temperature. Also, it is observed that the magnitude of intrinsic impedance decreases with increase in injected current. The impact of cold finger temperature on the intrinsic impedance characteristics are detailed for prospective Radio over Fiber (RoF) applications.

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“…Circuit‐based and rate equation‐based modeling 15 can effectively model DW‐QCLs as devised by Mohsen et al 16 Free space optics (FSO) communication using QCLs have gained attention as it supports large data rates, operating in unregulated spectrum. A comprehensive analysis on QCL‐based FSO communication is well documented in References 17–25. QWIP photodetectors reported in References 26,27 are popular candidates for mid infrared receiver.…”

Section: Introductionmentioning

confidence: 99%

Novel coding schemes for dual wavelength quantum cascade laser‐based free space optical links

Ashok

Madhan

Raja

et al. 2023

Int J Numerical Modelling

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Dual wavelength quantum cascade lasers (DW‐QCLs) are a type of semiconductor laser that can emit two different wavelengths of light simultaneously. They are constructed using quantum cascade structures, consisting of multiple layers of semiconductor materials carefully engineered to produce the desired wavelengths of light. This research article reports the numerical simulation and evaluation of the maximum capacity of free space optical (FSO) link employing novel coding schemes for DW‐QCL‐based pulsed optical transmitters. A 48‐stage DW‐QCL emitting at 10.5 and 8.9 μm wavelengths and a Quantum‐Well based Infrared Photodetector based receiver are considered for the study. The performance of the link is analyzed under short pulse transmission from the device at both wavelengths for various scenarios. Optical pulses are obtained either at a single wavelength or two different wavelengths by proper choice of electrical input current amplitude. This feature enables the implementation of four different coding schemes. Among the various coding approaches proposed, the scheme, which operates on symbols, performs the best, providing a maximum link length of 1700m, for a BER of 10−9.

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Simulation studies on polarization modulated vertical cavity surface emitting laser for combined fiber and free space optical links

Cited by 20 publications

References 21 publications

Spin Laser Local Oscillators for Homodyne Detection in Coherent Optical Communications

Spin Laser Local Oscillators for Homodyne Detection in Coherent Optical Communications

Numerical Investigation on the Temperature dependent Impedance Characteristics of Far-Infrared Quantum Cascade Lasers

Novel coding schemes for dual wavelength quantum cascade laser‐based free space optical links

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