Spectral characteristics of semiconductor lasers with optical feedback

Goldberg, L.; Taylor, Henry F.; Dandridge, A.; Weller, J. F.; Miles, R. O.

doi:10.1109/jqe.1982.1071581

Cited by 233 publications

(33 citation statements)

References 13 publications

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“…For that reason, in the majority of applications, great care is taken to coat the laser facets with anti-reflection coating, and to place optical isolators as close to the cavity as possible; but as controlled feedback can improve certain laser parameters, it has been extensively studied. Depending on specific conditions, optical feedback has been shown to make the laser multi-stable, have hysteresis phenomena, enhance, prolong or suppress the relaxation oscillation in the transient output, improve the laser's performance through noise suppression, reduce nonlinear distortion and modulation bandwidth enhancement, and, what is most relevant for our application, improve the laser linewidth [26][27][28][29][30][31].…”

Section: Utilizing Delayed On-chip Optical Feedbackmentioning

confidence: 99%

Widely-Tunable Ring-Resonator Semiconductor Lasers

et al. 2017

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Chip-scale widely-tunable lasers are important for both communication and sensing applications. They have a number of advantages, such as size, weight, and cost compared to mechanically tuned counterparts. Furthermore, they allow for integration in more complex integrated photonic chips to realize added functionality. Here we give an extensive overview of such lasers realized by utilizing ring resonators inside the laser cavity. Use of ring resonators for tuning allows for wide-tunability by exploiting the Vernier effect, and at the same time improves the laser linewidth, as effective cavity length is increased at ring resonance. In this review, we briefly introduce basic concepts of laser tuning using ring resonators. Then, we study a number of laser cavity configurations that utilize two ring resonators, and compare their tuning performance. We introduce a third ring resonator to the laser cavity, study three different cavity configurations utilizing three ring resonators, and select the optimal one, for which we show that laser tuning is straightforward, provided there are monitor photodetectors on-chip. Finally, we give a literature overview showing superior linewidth performance of ring-based widely-tunable lasers.

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Section: Utilizing Delayed On-chip Optical Feedbackmentioning

confidence: 99%

Widely-Tunable Ring-Resonator Semiconductor Lasers

et al. 2017

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“…Goldberg [1] has demonstrated that optical feedback from a single external mirror, 60 cm from the laser, produced significant levels of laser line narrowing and an associated decrease in the phase noise of 15 dB. The additional reflector forms a Fabry-Perot cavity with the laser output mirror and the intensity of the reflected light is dependent on wavelength, as shown in figure 1, limiting the possible frequency variations of the laser emission.…”

Section: Passive Optical Feedbackmentioning

confidence: 99%

The Reduction of Semiconductor Laser Phase Noise for Sensor Applications

Dakin¹,

Withers²

1986

Optica Acta: International Journal of Optics

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Semiconductor lasers are particularly attractive as sources for optical sensors. However, if they are to be incorporated in unbalanced interferometric sensors their phase noise must be reduced. This paper describes methods by which this may be achieved using (a) passive optical feedback from an array of mirrors or optical fibres, and (b) active control of the laser drive current from the output of an interferometer monitoring the laser emission.

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“…The simplest example of the second type of optical linewidth reduction (weak feedback) is when a small proportion of laser light, typically up to 1 x 10 -4 , is fed back from an external plane mirror . This method is easier to implement than the strong feedback method, and has been used to improve the linewidth by a factor of up to 100 [7] .…”

Section: Introductionmentioning

confidence: 99%