Low noise planar external cavity laser for interferometric fiber optic sensors

Stolpner, Lew; Lee, Sanggeon; Li, Steve; Mehnert, Axel; Mols, P.J.M.; Siala, S.; Bush, Jeff

doi:10.1117/12.786226

Cited by 25 publications

(15 citation statements)

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“…The technique of distributed Bragg reflector and distributed feedback can reduce the linewidth of a semiconductor laser to less than 100 kHz [4], [5]. Especially in recent years, the planar-waveguide external-cavity laser technology is able to squeeze the linewidth of laser diodes to as narrow as about 3 kHz, which is approaching the performance of a typical fiber laser [6]. Several methods are generally adopted in erbium-doped fiber lasers (EDFLs) to stabilize the lasing mode and achieve narrow linewidth, such as the Pound-Drever-Hall technique, distributed Bragg reflector, incorporating a saturable absorber, and external injection locking [7]- [10].…”

Section: Introductionmentioning

confidence: 98%

Strong Linewidth Reduction by Compact Brillouin/Erbium Fiber Laser

et al. 2014

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We demonstrate the strong linewidth reduction by a compact Brillouin/erbium fiber laser (BEFL), in which 4-m erbium-doped fiber (EDF) acts as both the Brillouin and linear gain media. Due to the assistance of the linear gain in the EDF with the acoustic damping and the cavity feedback in the resonator, the proposed BEFL transferred the 20-MHz Brillouin pump (BP) into the 950-Hz Brillouin Stokes laser emission, demonstrating that the laser linewidth is reduced by over 2 Â 10 4 times through this BEFL. The linewidth reduction is independent of the 980-nm pump power or the BP wavelength. The BEFL keeps strong linewidth reduction over the whole C-band. This effect of the BEFL provides a simple but effective way to obtain highly coherent light for many applications.Index Terms: Linewidth reduction, Brillouin/erbium fiber laser, stimulated Brillouin scattering.

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Section: Introductionmentioning

confidence: 98%

Strong Linewidth Reduction by Compact Brillouin/Erbium Fiber Laser

et al. 2014

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“…We used a 4 kHz linewidth, InP-based ECLD with an external Bragg grating on a silica planar lightwave circuit emitting at 1538.8 nm as a transmitter [9]. A CW light signal from the ECLD was IQ-modulated with a 5 Gsymbol/s, 64 QAM signal and a pilot tone signal generated by an arbitrary waveform generator (AWG) at 10 Gsample/s.…”

Section: Introductionmentioning

confidence: 99%

“…An InP-based external cavity laser diode (ECLD) [9] was used for the transmitter and LO. We added a tone that was 3.33 GHz higher than the center frequency of the data, to the input data.…”

Section: Introductionmentioning

confidence: 99%

60 Gbit/s, 64 QAM LD-based injection-locked coherent heterodyne transmission over 160 km with a spectral efficiency of 9 bit/s/Hz

Wang

Kasai

Yoshida

2014

IEICE Electron. Express

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Abstract:We report an injection-locked 60 Gbit/s 64 QAM coherent transmission employing a laser diode (LD) based heterodyne demodulation circuit. The LDs for the transmitter and receiver were InP-based external cavity laser diodes (ECLDs) emitting at 1538.8 nm. By using an injection locking technique with locking range of 100 MHz, we achieved low phase noise carrier synchronization between the data and the local oscillator with a phase noise of 0.3 deg. As a result, a polarization-multiplexed 64 QAM data signal was successfully transmitted over 160 km with a spectral efficiency of 9 bit/s/Hz.

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“…An optical phase demodulator (OPD-4000 from Optiphase Inc.) is used to provide the sinusoidal modulation voltage and to demodulate phase noise based on phase-generated carrier (PGC) technique simultaneously. This approach can measure laser phase noise because of its low self noise (few µrad/sqrt (Hz)) [3] . Both lasers can receive direct optical frequency modulation (i.e., active modulation), which is useful for remote passive interrogation of interferometric sensing based on the PGC technique [7] .…”

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confidence: 99%

“…An unbalanced Michelson or MachZehnder interferometer is usually adapted to measure laser phase noise [1−6] . Phase noise at 1-m optical path difference (OPD), which is usually normalized from the value measured at a long OPD of several tens of meters, is used to assess the performance of a laser [3] . Earlier investigations reported that the laser phase noise measured by the unbalanced interferometer is described as [1,6] ∆ϕ = 2πD c ∆v,…”

mentioning

confidence: 99%

Phase noise characteristics of narrow-linewidth f iber laser and laser diode in unbalanced interferometers

Zhou¹,

Chen²,

Zhang³

et al. 2013

Chin. Opt. Lett.

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The phase noises of two narrow-linewidth fiber laser and laser diode are measured by using unbalanced Michelson interferometers with various optical path differences (OPDs). The measured results indicate that the phase noises of the two lasers do not change linearly with the OPD over the range from 1 to 100 m. The laser diode exhibits phase noise levels higher than that of the fiber laser at OPDs longer than 10 m. However, the laser diode outperforms the fiber laser at OPDs shorter than 10 m. The results obtained can assess laser performance and determine the suitable laser for use in a particular application.

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Low noise planar external cavity laser for interferometric fiber optic sensors

Cited by 25 publications

References 0 publications

Strong Linewidth Reduction by Compact Brillouin/Erbium Fiber Laser

Strong Linewidth Reduction by Compact Brillouin/Erbium Fiber Laser

60 Gbit/s, 64 QAM LD-based injection-locked coherent heterodyne transmission over 160 km with a spectral efficiency of 9 bit/s/Hz

Phase noise characteristics of narrow-linewidth f iber laser and laser diode in unbalanced interferometers

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