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Linear phase-and-frequency-modulated photonic links using optical discriminators.

J M Wyrwas¹, R Peach, S Meredith

¹Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA. jwyrwas@berkeley.edu

|November 29, 2012

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Researchers improved analog optical links using novel discriminators, achieving over 6 dB higher third-order output intercept point (OIP3) and better signal compression compared to standard Mach-Zehnder modulator (MZM) links.

Area of Science:

Photonics and Optical Engineering
Analog Signal Processing
Communications Systems

Background:

Linear analog optical links are crucial for high-performance signal transmission.
Existing Mach-Zehnder modulator (MZM) links face limitations in linearity and distortion.
Optical discriminators offer potential for enhanced link performance.

Purpose of the Study:

To experimentally evaluate linear analog optical links employing phase or frequency modulation with advanced optical discriminators.
To quantify improvements in linearity, specifically the third-order output intercept point (OIP3), compared to traditional MZM links.
To assess the impact of these discriminators on signal compression and distortion.

Main Methods:

Implementation of two optical discriminator architectures: cascaded Mach-Zehnder interferometer (MZI) Finite Impulse Response (FIR) lattice filter and a ring-assisted MZI (RAMZI) Infinite Impulse Response (IIR) filter.

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Utilizing phase or frequency modulation within the optical links.

Employing balanced detection to minimize second-order distortion.

Characterizing link performance using high optical power.

Main Results:

Demonstrated > 6 dB improvement in the link's third-order output intercept point (OIP3) for both MZI FIR and RAMZI IIR discriminator architectures compared to a MZM link.
Achieved low second-order distortion through the use of balanced detection.
Reached a maximum OIP3 of 39.2 dBm with high optical power.
Showcased a 4.3 dB improvement in signal compression.

Conclusions:

Cascaded MZI FIR and RAMZI IIR optical discriminators significantly enhance the linearity of analog optical links.
Balanced detection effectively mitigates second-order distortion, enabling high-fidelity signal transmission.
These advanced discriminator designs represent a substantial improvement for analog optical link performance, particularly in demanding applications requiring high OIP3 and reduced signal compression.