Implementation of a precise quadrature point bias controller to the integrated intensity electro-optic modulator

Svarny, J.

doi:10.1109/bec.2012.6376834

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The deviations of measured levels from theoretical values (10) and (11) for particular harmonics as a function of the DC bias are in Fig. 12.…”

Section: Resultsmentioning

confidence: 98%

“…There have been developed a lot of techniques to control the bias voltage of the intensity MZM [4][5][6][7]. The most effective methods use the injection of harmonic pilot signal to the modulator bias port and the detection of harmonic components at the modulator output [8][9][10][11]. The feedback system is designed to control the DC bias voltage to achieve the desired harmonics at the output.…”

Section: Introductionmentioning

confidence: 99%

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Emulator of harmonic distortion of bias port of the mach-zehnder intensity modulator

Svarny

2018

Journal of Electrical Engineering

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The paper deals with the design of an analog circuit to substitute the role of a real intensity Mach-Zehnder modulator for the preliminary tuning of bias controllers. The proposed circuit has similar harmonic distortion as an electro-optic modulator biased around the quadrature operating point. The designed device utilizes a shaping circuit based on a differential pair of bipolar junction transistors. The harmonic distortion of both the Mach-Zehnder intensity modulator and the differential amplifier are analysed. A method to design the emulating circuit of desired features is described and explained and a the comparison of the measured results to the theory is presented.

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“…The deviations of measured levels from theoretical values (10) and (11) for particular harmonics as a function of the DC bias are in Fig. 12.…”

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Emulator of harmonic distortion of bias port of the mach-zehnder intensity modulator

Svarny

2018

Journal of Electrical Engineering

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“…The bias controller is based on harmonic analysis of the modulator output and manual elimination of 2 nd harmonic of temporarily injected signal [7]. The principle is as follows: Provided the input bias voltage V bias is formed by superposition of a DC component V DC and an AC harmonic component with amplitude V AC (2), the equation (1) can be rewritten to (3).…”

Section: Bias Controller Modulementioning

confidence: 99%

Specialized compact external electro-optic modulating unit

Svarny

2013

2013 36th International Conference on Telecommunications and Signal Processing (TSP)

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As a vital part of specialized electro-optic transmission system a broadband external modulating unit was designed and developed. The unit is based on an integrated intensity modulator of Mach-Zehnder type. Paper deals with design of auxiliary circuitry of the modulator and its implementation in order to achieve desired functionality. Solution of a broadband driver, original -manually adjustable bias controller and a power supply of the unit is presented here. Integration of all the circuits together makes the final hardware compact and unique as well.

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Multi-Degree-of-Freedom Stabilization of Large-Scale Photonic-Integrated Circuits

Fisher

Kodanev

Nazarathy

2015

J. Lightwave Technol.

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We present and elaborate the principles of a novel control and calibration (C&C) systematic approach, aiming at feedback stabilization of large scale photonic-integrated circuits (PIC) to their nominal operating points in D-dimensional spaces of tuning parameters, based on refinement of extremum-seeking (ES) realtime optimization techniques. The novel methodology enables, in principle, stabilizing a large number D of tuning degrees of freedom (DOF) of PICs, with just one optical power monitoring (probe) point. The proposed C&C digital controller ports multidimensional ES stabilization concepts to photonics for the first time and further introduces novel improvements to known ES techniques, proposing a new frame-based discrete-multitone method of actuation signals generation and probe signals detection, akin to an orthogonal-frequency-division multiplexing modulation format. Another novel element is that the iterative digital algorithm adaptively selects between gradient-versus Newton-based descent and between various methods of line search. This approach enables real-time application of unconstrained optimization techniques for C&C of photonic circuits with multiple tuning DOFs. The new technique is exemplified by numeric simulations of the stabilization of a Silicon photonic microring modulator with D = 2 tuning DOFs, concurrently tuning both resonant phase and a second coupling phase parameter, optimizing critical coupling into the microring based on observing the optical power at single low-frequency monitoring point.

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Implementation of a precise quadrature point bias controller to the integrated intensity electro-optic modulator

Cited by 4 publications

References 3 publications

Emulator of harmonic distortion of bias port of the mach-zehnder intensity modulator

Emulator of harmonic distortion of bias port of the mach-zehnder intensity modulator

Specialized compact external electro-optic modulating unit

Multi-Degree-of-Freedom Stabilization of Large-Scale Photonic-Integrated Circuits

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