Frequency offset locking of AlGaAs semiconductor lasers

Kuboki, K.; Ohtsu, Motoichi

doi:10.1109/jqe.1987.1073362

Cited by 38 publications

(12 citation statements)

References 17 publications

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“…DLs' center frequencies are known to fluctuate widely, as a result of changes in injection current or room temperature. 19,20) To maintain control, we introduced a frequency synthesizer 24) and a frequency noise detector (Fig. 5).…”

Section: Methodsmentioning

confidence: 99%

Physical-random number generation via a diode laser’s frequency noise: an investigation into frequency discriminator

Arai

Satō

Doi

et al. 2019

Jpn. J. Appl. Phys.

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Diode Lasers (DLs) are influenced by fast frequency noise stemming from fluctuations in spontaneous emissions, a phenomenon that is of great use when generating fast physical-random numbers. This paper describes a physical-random number generator that uses a DLs frequency noise and rubidium (Rb) absorption lines as frequency noise sources and frequency discriminators. This device actually produced physical-random numbers at a rate of 500 megabits per second, but it depends on the relation between the DL frequency noise and frequency discriminator characteristics. This relation is investigated and the conditions for physical-random number generation are explained.

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Section: Methodsmentioning

confidence: 99%

Physical-random number generation via a diode laser’s frequency noise: an investigation into frequency discriminator

Arai

Satō

Doi

et al. 2019

Jpn. J. Appl. Phys.

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“…[1][2][3][4][5][6][7] Several methods are known to produce such phase-coherent beams. The methods utilizing a phase-locked loop (PLL) [8][9][10][11][12] and also an electro-optic modulator (EOM) 13,14) have been employed to produce a frequency shifted beam that has a high degree of phase coherence. The PLL method using two independent lasers is not necessary to apply an EOM.…”

Section: Introductionmentioning

confidence: 99%

Carrier Suppression of Phase Modulated Beam Using Optical Cavity for Coherent Population Trapping Clock

Choi¹,

Park

Lee

et al. 2010

Jpn. J. Appl. Phys.

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We present a method of carrier suppression of a phase-coherent laser beam produced by an electro-optic modulator for coherent population trapping (CPT) clock. To suppress the undesired strong carrier mode of the phase-modulated beam, a Fabry–Perot (FP) cavity is used as an optical filter. The intensity of the carrier mode is reduced by 70% without significant loss of the two first-order side modes for CPT clock. The contrast of the CPT signal is improved by a factor of 1.4 when the carrier-suppressed phase-coherent laser beam is applied to a 87Rb CPT clock.

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“…This method, however, eliminates many tunable-LO advantages such as fast and wide-ranging tunability, good long�term stability, or small device size. Another, more promising, method is to ex tcnd the dynamic range of the phase detector by using digital circuits [9]. This method can track a tunable OBR LO even if its linewidth is more than IO MHz, and the residual frequency fluctuations can be as small as 0.04 Hz at an averaging time of 500 s [10].…”

mentioning

confidence: 99%

“…This makes such a conventional PLL achievable only with the narrow-lincwidth lasers such as gas lasers [19], Nd: Y AG lasers [20], or external cavity LD's [6]- [8]. The PLL bandwidth requirement, however, can be relaxed by using a wide-dynam ic-range digital phase detector [9] at the expense of excellent (steady -state) phase-error. detector employed in our previous experiments [10], [13] [15].…”

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confidence: 99%

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Lightwave frequency tracking with a tunable DBR laser

Ishida

1991

J. Lightwave Technol.

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This paper describes the construction and noise performance of a lightwave frequency tracking loop, which is indispensable for submegahertz frequency-control of tunable laser diodes (LD's). The tracking loop is constructed with a tunable distributed-Bragg-reflector (DBR) LD as a conven tional phase-locked loop (PLL), and a wide-dynamic-range dig ital phase detector is employed to overcome the extremely large phase noise of the DBR LD. The white and flicker frequency noise components of the phase noise in an experimental DBR LO are estimated from measured Iinewidth Ll v and frequency fluctuations a" respectively, and the increase in the flicker component with tuning is reported for the first time. A PLL analysis based on the measured values of Llv = 29 MHz and a, = 2.4 MHz predicts that the phase error in the tracking loop is mainly caused hy the flicker frequency-noise component not by the white frequency-noise component. A tracking experi ment with the OBR LD demonstrates that measured noise per formance agrees with theoretical predictions. Guidelines for tracking-loop designs are also described.

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Frequency offset locking of AlGaAs semiconductor lasers

Cited by 38 publications

References 17 publications

Physical-random number generation via a diode laser’s frequency noise: an investigation into frequency discriminator

Physical-random number generation via a diode laser’s frequency noise: an investigation into frequency discriminator

Carrier Suppression of Phase Modulated Beam Using Optical Cavity for Coherent Population Trapping Clock

Lightwave frequency tracking with a tunable DBR laser

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