Steady-State Analysis of the Effects of Residual Amplitude Modulation of InP-Based Integrated Phase Modulators in Pound-Drever-Hall Frequency Stabilization

Residual amplitude modulation of the phase modulator deployed in Pound-Drever-Hall frequency stabilization is an effect known to cause instabilities to the absolute wavelength of the stabilized laser. We present measurements and analysis of the residual amplitude modulation in an InP-based waveguide...

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Bibliographic Details
Published in:IEEE photonics journal 2019-06, Vol.11 (3), p.1-14
Main Authors: Andreou, Stefanos, Williams, Kevin A., Bente, Erwin A. J. M.
Format: Article
Language:English
Subjects:
Amplitude modulation
Amplitudes
Etalons
Frequency modulation
Frequency stabilization
InP
Integrated photonics
Laser stability
laser stabilization
Laser tuning
Lasers
Modulators
Offsets
Phase modulation
phase modulator
Pound–Drever–Hall
Random access memory
Voltage measurement
Wideband communications
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Summary:Residual amplitude modulation of the phase modulator deployed in Pound-Drever-Hall frequency stabilization is an effect known to cause instabilities to the absolute wavelength of the stabilized laser. We present measurements and analysis of the residual amplitude modulation in an InP-based waveguide electro-optic phase modulator. The modulator is monolithically integrated in the output waveguide of a tuneable laser. The effects on the frequency stabilization of such a laser system to a reference etalon using a Pound-Drever-Hall frequency stabilization scheme are quantified. Frequency offset values in the stabilization point from the reference Fabry-Perot etalon resonance caused by the amplitude modulation are predicted and optimum operating points to minimize residual amplitude modulation are discussed. By operating an electro-refractive phase modulator at the proper bias point, we show that frequency offsets corresponding to less than 3 × 10 −3 of the reference cavity full-width half-maximum can be achieved.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2019.2915163