Directly Modulated Semiconductor Lasers

Zhu, Ning Hua; Shi, Zhun; Zhang, Zhi ke; Zhang, Yi Ming; Zou, Can; Zhao, Ze; Liu, Yu; Li, Wei; Li, Ming

doi:10.1109/jstqe.2017.2720959

Cited by 51 publications

(17 citation statements)

References 177 publications

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“…After filtering out unnecessary noise by the band pass filter (BPF), the generated electric mm-wave signal is amplified by an electrical amplifier (EA) and transmitted to the user through the antenna. Due to it changes the optical intensity information, it is also called intensity modulation (IM) [16,17]. However, the modulation scheme is only divided into two working states with and without light or little light.…”

Section: Directly Modulated Laser (Dml)mentioning

confidence: 99%

Review on the Millimeter-Wave Generation Techniques Based on Photon Assisted for the RoF Network System

Xiao

Zhao

Feng

et al. 2020

Advances in Condensed Matter Physics

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With the development trend of wireless and broadband in the communication link and even the whole information industry, the demand of high-frequency microwave bandwidth has been increasing. The RoF network system solves the problem of spectrum congestion in low-frequency band by providing an effective technology for the distribution of high-frequency microwave signals over optical fiber links. However, the traditional mm-wave generation technique is limited by the bandwidth of electronic devices. It is difficult to generate high-frequency and low-phase noise mm-wave signals with pure electrical components. The mm-wave communication technology based on photon assisted can overcome the bandwidth bottleneck of electronic devices and provide the potential for developing the low-cost infrastructure demand of broadband mobile services. This paper will briefly explain the characteristics of the RoF network system and the advantages of high-frequency mm-wave. Then we, respectively, introduce the modulation schemes of RoF mm-wave generation based on photon assisted including directly modulated laser (DML), external modulation, and optical heterodyne. The review mainly focuses on a variety of different mm-wave generation technologies including multifrequency vector mm-wave. Furthermore, we list several approaches to realize the large capacity data transmission techniques and describe the digital signal processing (DSP) algorithm flow in the receiver. In the end, we summarize the RoF network system and look forward to the future.

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Section: Directly Modulated Laser (Dml)mentioning

confidence: 99%

Review on the Millimeter-Wave Generation Techniques Based on Photon Assisted for the RoF Network System

Xiao

Zhao

Feng

et al. 2020

Advances in Condensed Matter Physics

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“…The modulation bandwidth of CPR type lasers can be enhanced by optimizing the laser geometry and materials to shorten the laser cavity, increase the confinement factor, and raise the differential gain of multiple quantum well (MQW) structures. The modulation bandwidth can also be enhanced by the photon-assisted effect through optical injection locking (OIL), integrated grating reflectors, and integrated passive reflectors [6][7][8][9]. As specific examples, some research groups demonstrate the use of shorter-cavity DFB laser to achieve high modulation bandwidth, but it suffers from the cleavage yield and poor heatsink issues [10][11].…”

Section: Introductionmentioning

confidence: 99%

Improvement on Direct Modulation Responses and Stability by Partially Corrugated Gratings Based DFB Lasers With Passive Feedback

2021

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DFB lasers with ultrashort cavities or integrated DFB lasers with passive waveguide reflectors are frequently proposed to realize directly modulated lasers (DMLs) for carrying ultrahigh data rate signals. The former suffers from poor heatsink and laser cleavage yield, while the single-mode stability of the latter scheme is seldom addressed. The mode selection and device performance of a DFB laser is well known to be very sensitive to the facet reflection and external optical feedback. The DFB lasers with partial corrugated gratings and passive feedback (PCG-PFL) are proposed here to overcome the challenging issues for the aforementioned two schemes. With PCG structure, the DFB lasers can maintain high single-mode yield (SMY) even with a high-reflection-coating on the rear facet and strong reflection from the integrated passive section. This provides the robustness in applying the integrated passive reflector to reshape the modulation response or to enhance the 3-dB bandwidth by using the photon-photon resonance (PPR) effect. By designing the PCG-PFL to have 150-m long laser section, 50-m long passive section, and 30% front-facet reflectivity, it can have about 86% of SMY, reduced resonant peak in the intensity modulation response, and reduced waveform overshoot and undershoot for transmitting 56-Gbaud/s PAM-4 signals. By using a longer passive reflector, enhanced bandwidth can be achieved by the PPR effect.

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“…The direct modulation of a laser diode using a driving current cannot achieve data bit rates much higher than few tens of gigabit per second (Gbit/s). Typically, direct modulation is used to realise data bit rates well below 20 Gbit/s [73], because direct modulation of laser diodes beyond few Gbit/s leads to several undesirable effects such as optical frequency chirping (due to refractive index modulation induced by the current used to modulate the laser diode). The chirp parameter is defined as the ratio of the changes in the real and imaginary part of the refractive index caused by the laser injection current.…”

Section: Introductionmentioning

confidence: 99%

Resonant Tunneling Diode Photonics

Ironside

Romeira

Figueiredo

2019

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Optical communication systems relying on microwave/millimetre-wave-optical transducers are fundamental to the development of applications such as low-cost fibre-optic communication networks, radio-over-fibre wireless communications, and radio phased array antennas. Those systems require the use of very fast optical modulators[72] since laser diodes cannot be directly modulated at frequencies beyond their resonance frequency which is typical below few tens of gigahertz [73]. In this chapter we cover our work on low driving voltage highspeed and highly efficient electrical active electro-absorption modulators (EAMs). The EAM is based on the integration of a double barrier quantum well (DBQW) structure within AlGaAs/GaAs and InGaAlAs/InGaAs unipolar semiconductor optical waveguides and operates at the optical windows corresponding to wavelengths around 900 nm, 1300 and 1550 nm. This novel device is known as resonant tunnelling diode electro-absorption modulator (RTD-EAM).

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Directly Modulated Semiconductor Lasers

Cited by 51 publications

References 177 publications

Review on the Millimeter-Wave Generation Techniques Based on Photon Assisted for the RoF Network System

Review on the Millimeter-Wave Generation Techniques Based on Photon Assisted for the RoF Network System

Improvement on Direct Modulation Responses and Stability by Partially Corrugated Gratings Based DFB Lasers With Passive Feedback

Resonant Tunneling Diode Photonics

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