Towards Practical Implementation of Phase-Sensitive Amplifier Based Transmission Systems
Licentiatavhandling, 2013

All commercially available optical amplifiers are so-called phase-insensitive amplifiers (PIAs) which degrade the signal-to-noise ratio (SNR) through the amplification process. This kind of amplifier has a quantum limited noise figure (NF) of 3 dB. Another category of amplifiers are phase-sensitive amplifiers (PSAs) which in theory are capable of noiseless amplification, i.e. amplification with a 0 dB NF. Successful implementation of PSAs in transmission systems would lead to significant performance improvements compared to using conventional PIAs. However, the implementation is challenging and no system with wavelength division multiplexing (WDM) compatibility has previously been demonstrated over a significant transmission distance. This thesis is dedicated to realizing and investigating the properties of PSA-amplified transmission links utilizing fiber optical parametric amplifiers (FOPA) and the so-called copier-PSA scheme. One of the main challenges on the way towards realization is to recover and amplify a weak phase-modulated wave with high fidelity. To handle this, a hybrid injection locking (IL)/Erbium-doped fiber amplifier (EDFA)-based pump recovery system was designed and thoroughly investigated experimentally. Other challenges include continuous phase-locking of several waves and high-precision wave tuning. A single-span PSA-amplified transmission link with WDM compatibility was demonstrated over 80 km of fiber. The link performance was compared against a conventional EDFA-based link for operation both in the linear and nonlinear transmission regime. The PSA-amplified system is shown to have capability to mitigate nonlinear distortions due to the Kerr effect and outperform the EDFA-amplified link in both regimes.

phase-sensitive amplification

four-wave mixing

nonlinear optical signal processing

optical injection locking

fiber nonlinearities

fiber optic parametric amplification

A423 (Kollektorn, MC2)
Opponent: Dr. Bengt-Erik Olsson, Ericsson Research, Sweden


Samuel L I Olsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Phase-Sensitive Amplified Optical Link Operating in the Nonlinear Transmission Regime

38th European Conference on Optical Communication and Exhibition, ECOC 2012, Amsterdam, 16-20 September 2012,; (2012)

Paper i proceeding

Injection locking-based pump recovery for phase-sensitive amplified links

Optics Express,; Vol. 21(2013)p. 14512-14529

Artikel i vetenskaplig tidskrift

Phase-Sensitive Optical Pre-Amplifier Implemented in an 80km DQPSK Link

Optics InfoBase Conference Papers,; (2012)p. Art. no. 6192234-

Paper i proceeding


Informations- och kommunikationsteknik



Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology: 260

A423 (Kollektorn, MC2)

Opponent: Dr. Bengt-Erik Olsson, Ericsson Research, Sweden