Distributed feedback laser diode and module for CATV systems

Takemoto, A.; Watanabe, Hitoshi; Nakajima, Yasuo; Sakakibara, Yasushi; Kakimoto, S.; Yamashita, J.; Hatta, Tatsuo; Miyake, Yoshio

doi:10.1109/49.59137

Cited by 27 publications

(5 citation statements)

References 26 publications

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“…Indeed, transmitters based on vertical cavity surface emitting laser (VCSELs), typically exhibit higher values of distortion and noise, though presenting attractive features in terms of low cost and lowpower consumption. [23][24][25] Those based on Fabry-Perot (FP) lasers tend instead to present higher noise and comparable/lower distortion performances with respect to DFB-based ones 26,27 and could represent a possible solution in case their cost were substantially lower. However, only FP lasers working at the wavelengths of 1310 and 1550 nm can be effectively regarded as very lowcost devices, because of their popularity on the market.…”

Section: Rfof Technology In Radio Astronomy and In Ska-lowmentioning

confidence: 99%

Radio frequency over fiber technology for SKA-low receiver

Perini

Rusticelli

Schiaffino

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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The signal reception chain is an essential element for achieving the square kilometer array-low (SKA-low) system requirements in terms of high sensitivity and dynamic range. The balance between gain, linearity, and low power consumption, as well as the cost, are fundamental parameters that influence the selection of the most suitable technology for SKA-low. Further factors, such as low self-generated radio frequency (RF) interference, high reliability, robustness under extreme environment, and last but not least, the distance between the antennas and the acquisition systems, have impacts on the selection for both architecture and receiver system design. The selected technology for the SKA-low RF signal transportation is RF-over-fiber systems, where the preamplified RF signal picked up by the antennas is carried via analogue modulation over optical fiber. The rationales behind the selection are reported, along with descriptions on the development of the receiver prototypes. The prototypes were deployed and installed on the demonstrator arrays at the selected SKA-low site in Western Australian. Particular attention has been put on the thermal characterization of the receiver system under the actual operating temperature on site, especially when both transmitting part and the optical medium are subjected to external ambient temperature variations. Performance issues encountered in the demonstrator arrays are also discussed along with some proposals for future activities.

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Section: Rfof Technology In Radio Astronomy and In Ska-lowmentioning

confidence: 99%

Radio frequency over fiber technology for SKA-low receiver

Perini

Rusticelli

Schiaffino

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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“…Laser distortion can be affected by factors including spatial hole burning, gain suppression, and relaxation frequency [1][2][3]. In this study, the material compositions of the quantum wells (QWs) and the barriers of the GaInAsP DFB laser were varied to achieve high density of states reducing the gain suppression at higher operating currents.…”

Section: Designmentioning

confidence: 99%

Low distortion 1550 nm GaInAsP DFB lasers for digital QAM and analog forward path applications

Lin

Zhang

Liao

et al. 2014

2014 IEEE Photonics Conference

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“…Since analog modulation is adopted in such optical systems, the system performance can be degraded seriously due to the inherent nonlinearities of semiconductor lasers. [9][10][11][12][13] The nonlinearity occurred at a frequency less than 1 GHz is primarily due to the nonlinear light-to-current characteristics. For high frequency applications, the nonlinear interaction between electrons and photons in the laser cavity is the main cause of the nonlinear distortion.…”

Section: Introductionmentioning

confidence: 99%

Reduction of harmonic distortion in injection-locked semiconductor lasers

Hwang

Liu

White³

2004

SPIE Proceedings

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The characteristics of the second harmonic distortion (SHD) and the third harmonic distortion (THD) are experimentally investigated in a semiconductor laser subject to external optical injection. Compared with the free-running laser, both SHD and THD in the injection-locked semiconductor laser are observed to reduce significantly and equally for a large range of modulation power at a modulation frequency of 5 GHz, which are 15-dB and 23-dB decreased, respectively. At a fixed modulation power of 6 dBm, the reduction of SHD and THD is, however, found to vary with modulation frequency. The reduction of SHD is more substantial at around one-half of the relaxation resonance frequency of the free-running laser. The decrease in THD is, however, more significant at around one-half and one-third of the relaxation resonance frequency of the free-running laser. The reduction in harmonic distortions is also found to vary with the operational parameters of the injection signal. The reduction of SHD increases with the decreasing injection strength and the negatively decreasing detuning frequency, while that of THD shows a completely opposite behavior.

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Distributed feedback laser diode and module for CATV systems

Cited by 27 publications

References 26 publications

Radio frequency over fiber technology for SKA-low receiver

Radio frequency over fiber technology for SKA-low receiver

Low distortion 1550 nm GaInAsP DFB lasers for digital QAM and analog forward path applications

Reduction of harmonic distortion in injection-locked semiconductor lasers

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