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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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In-line phase sensitive amplifier based on PPLN waveguides.

Takeshi Umeki¹, Masaki Asobe, Hirokazu Takenouchi

¹NTT Photonics Labs, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan. umeki.takeshi@lab.ntt.co.jp

|June 6, 2013

Summary

This summary is machine-generated.

This study presents a novel phase-sensitive amplifier (PSA) for phase shift keying (PSK) signals. The system effectively recovers and synchronizes the carrier, enabling signal regeneration and overcoming fiber non-linearities.

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Area of Science:

Optoelectronics
Nonlinear Optics
Optical Communications

Background:

Phase shift keying (PSK) signals are crucial for high-capacity optical communication.
Signal degradation due to fiber non-linearities and dispersion limits transmission distance.
Efficient in-line signal regeneration techniques are needed to extend reach and maintain signal integrity.

Purpose of the Study:

To demonstrate a novel in-line phase-sensitive amplifier (PSA) for PSK signals.
To achieve carrier recovery, phase locking, and signal regeneration.
To mitigate non-linear impairments in optical fiber transmission.

Main Methods:

Utilizing a χ(2)-based nonlinear optical process in a periodically poled lithium niobate (PPLN) waveguide.
Implementing a carrier-recovery system via phase doubling through wavelength conversion.
Employing optical injection locking for carrier phase synchronization.
Leveraging degenerate parametric amplification for phase-sensitive amplification.

Main Results:

Achieved a phase-sensitive amplifier with a wide dynamic range of 20 dB.
Demonstrated successful carrier recovery and phase locking for PSK signals.
Verified phase regeneration through constellation analysis and bit-error rate measurements.
Operated the in-line PSA as a repeater amplifier in a 160 km fiber link without power penalty.
Successfully regenerated non-linear impairments induced by fiber non-linearity.

Conclusions:

The developed χ(2)-based in-line PSA effectively regenerates degraded PSK signals.
The system enables long-haul optical communication by mitigating non-linear effects.
This technology offers a promising solution for future high-performance optical networks.