Delay, linewidth and bandwidth limitations in optical phase-locked loop design

Ramos, Rogerio T.; Seeds, A.J.

doi:10.1049/el:19900254

Cited by 91 publications

(52 citation statements)

References 1 publication

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“…(2) and loop stability considerations, the maximum achievable bandwidth of an OPLL is ultimately limited by the loop propagation delay τ S . 10 OPLLs constructed using free-space optics 6 or integrated optics 11,12 offer the possibility of achieving bandwidths up to a few gigahertz. However, this is based on the assumption of a well-behaved SCL FM response F SC L F M ( f ).…”

Section: Optical Engineeringmentioning

confidence: 99%

Phase noise reduction of a semiconductor laser in a composite optical phase-locked loop

et al. 2010

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Abstract. The bandwidth and residual phase noise of optical phaselocked loops (OPLLs) using semiconductor lasers are typically constrained by the nonuniform frequency modulation response of the laser, limiting their usefulness in a number of applications. It is shown in this work that additional feedback control using an optical phase modulator improves the coherence between the master and slave lasers in the OPLL by achieving bandwidths determined only by the propagation delay in the loop. A phase noise reduction by more than a factor of two is demonstrated in a proof-of-concept experiment using a commercial distributed feedback semiconductor laser. C 2010 Society of Photo-Optical Instrumentation Engineers.

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Section: Optical Engineeringmentioning

confidence: 99%

Phase noise reduction of a semiconductor laser in a composite optical phase-locked loop

et al. 2010

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“…To minimize the phase error e , we want the loop BW, which depends on K dc , to be as large as possible. However the stability criterion of a negative feedback control system, combined with the nonuniform FM response of SCLs and the loop delay, limit the achievable loop BW [16][17][18].…”

Section: Optical Phase Locked Loops: Theory and Experimentsmentioning

confidence: 99%

“…To start the analysis we again use Eqs. (17) and (18) to calculate the combining efficiency. In this case the bar in Eq.…”

Section: Effect Of Phase-front Deformationmentioning

confidence: 99%

Coherent beam combining with multilevel optical phase-locked loops

et al. 2007

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Coherent beam combining (CBC) technology holds the promise of enabling laser systems with very high power and near-ideal beam quality. We propose and demonstrate a novel servo system composed of multilevel optical phase lock loops. This servo system is based on entirely electronic components and consequently can be considerably more compact and less expensive compared to servo systems made of optical phase/frequency shifters. We have also characterized the noise of a 1064 nm Yb-doped fiber amplifier to determine its effect on the CBC and studied theoretically the efficiency of combining a large array of beams with the filled-aperture implementation. In a proof-of-concept experiment we have combined two 100 mW 1064 nm semiconductor lasers with an efficiency of 94%.

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“…The reference laser power coupled into each OPLL is about 3 dBm and could be much lower since the loop gain can be compensated electronically. The two LO (slave) lasers are external cavity SCLs with a nominal output power of 75 mW 1041-1135/$25.00 © 2008 IEEE [6], [7]. However, the bandwidth of our OPLL is instead limited to about 3 MHz by the characteristic phase reversal of the FM response of SCLs due to competing thermal and free carrier effects [8].…”

Section: Introductionmentioning

confidence: 99%

Phase-Controlled Apertures Using Heterodyne Optical Phase-Locked Loops

Satyan

Liang

Aflatouni

et al. 2008

IEEE Photon. Technol. Lett.

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Abstract-In this letter, we demonstrate the use of an electronic feedback scheme using a voltage controlled oscillator (VCO) to control the optical phase of individual semiconductor lasers (SCLs) phase locked to a common reference laser using heterodyne optical phase-locked loops (OPLLs). The outputs of two external cavity SCLs phase-locked to a common reference laser are coherently combined, and the variation in the relative optical path lengths of the combining beams is corrected by dynamically changing the phase of the offset radio-frequency signal fed into one of the OPLLs by means of a VCO. A stable power combination efficiency of 94% is achieved. This inherently different method of phase control, i.e., electronic rather than the use of electrooptic crystals, is deemed essential for new applications involving coherent optoelectronics.Index Terms-Coherent optics, optical phase-locked loops (OPLLs), semiconductor laser (SCL) arrays.

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Delay, linewidth and bandwidth limitations in optical phase-locked loop design

Cited by 91 publications

References 1 publication

Phase noise reduction of a semiconductor laser in a composite optical phase-locked loop

Phase noise reduction of a semiconductor laser in a composite optical phase-locked loop

Coherent beam combining with multilevel optical phase-locked loops

Phase-Controlled Apertures Using Heterodyne Optical Phase-Locked Loops

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