Spectral analysis of optical mixing measurements

A general rigorous theory of optical heterodyne and homodyne measurements is presented. The power spectrum of the photocurrent resulting from two uncorrelated optical beams mixing on a photodetector is derived. In particular, a rigorous analysis is presented for the delayed self-homodyne method which is used to characterize laser source linewidth by a Mach-Zehnder interferometer with a delay exceeding the source coherence length. Existing treatments are generalized to address non-Lorentzian laser sources of arbitrary lineshape. The analysis is further generalized to cover the case of modulated nonstationary sources. An example of the application of this theory is given. It is shown how the theory may be used to interpret an experimental result obtained using the gated delayed self-homodyne technique for characterizing the frequency chirp of laser sources under modulation. >

[1]  J. Armstrong,et al.  Theory of Interferometric Analysis of Laser Phase Noise , 1966 .

[2]  K. Kikuchi,et al.  Novel method for high resolution measurement of laser output spectrum , 1980 .

[3]  K. Petermann,et al.  Semiconductor laser noise in an interferometer system , 1981 .

[4]  Synthetic heterodyne interferometry for semiconductor laser spectral analysis , 1984 .

[5]  Philippe Gallion,et al.  Quantum phase noise and field correlation in single frequency semiconductor laser systems , 1984 .

[6]  T. Okoshi,et al.  Measurement of FM noise, AM noise, and field spectra of 1.3 µm InGaAsP DFB lasers and determination of the linewidth enhancement factor , 1985 .

[7]  J. Goodman,et al.  Theory of laser phase noise in recirculating fiber-optic delay lines , 1985 .

[8]  B. Moslehi.  Analysis of optical phase noise in fiber-optic systems employing a laser source with arbitrary coherence time , 1986 .

[9]  R. Tkach,et al.  Phase noise and linewidth in an InGaAsP DFB laser , 1986 .

[10]  C. Henry.  Phase noise in semiconductor lasers , 1986 .

[11]  S. Ryu,et al.  Measurement of direct frequency modulation characteristics of DFB-LD by delayed self-homodyne technique , 1986 .

[12]  L. Richter,et al.  Linewidth determination from self-heterodyne measurements with subcoherence delay times , 1986 .

[13]  B. Moslehi.  Noise power spectra of optical two-beam interferometers induced by the laser phase noise , 1986 .

[14]  Kazuro Kikuchi,et al.  Coherent Optical Fiber Communications , 1988 .

[15]  T. Okoshi,et al.  Effect of frequency offset in DPSK phase-diversity optical receivers , 1988 .

[16]  Measurement of a modulated DFB laser spectrum using gated delayed self-homodyne technique , 1988 .