@inproceedings{19ded117b5884556a8a1b6577a0b5350,
title = "Phase-sensitive optical amplifiers",
author = "Prem Kumar and Kath, {William L.} and Li, {Ruo Ding}",
note = "Funding Information: PSAs can be implemented by using either the x ( {\~o} )r the x ( {\~n} )onlinearity. Quantum-limited bulk-optic PSAs that exploit the x ( {\~n} o)nlinearity of KTP have recently been demonstrated [l]. Over 20 dB of unsaturated gain has been observed when using a 5 mm crystal that is pumped by a Q-switched and mode-locked Nd:YAG laser generating 1OOps pulses at 1064 nm [l].W aveguide parametric oscillators and amplifiers based on the x ( {\~n} o)nlinearity of Ti-in-diffused LiNb03 have also been demonstrated [5]. However, the obtainable gains were low due to the difficulty of achieving phase-matching of the signal mode of the waveguide (at frequency w ) with the pump mode (at frequency 2w). Since the earlier work, quasi-phase-matching schemes have been pioneered in the quest for developing efficient frequency doublers for low-power semiconductor diode lasers [6]. Devices have been demonstrated with significant progress only in the frequency doubling application. It should be possible to use the same techniques to develop waveguide PSAs because a parametric amplifier is nothing but a frequency doubler in reverse. For application in communication links and networks, PSAs that exploit the nonlinear refractive index n2 of the fiber may hold more promise [7]. Quantum limited performance of these fiber amplifiers with zero signal input has recently been demonstrated in efforts to generate squeezed states of light [8]. In communication systems and networks, however, the quantum-limited nature of the PSAs (no spontaneous-emission noise and O dB noise figure) and their ability to compensate dispersion will be more important than the fact that they are capable of generating squeezed light. This work was supported in part by the Air Force Office of Scientific Research and the Advanced Research Projects Agency. ,; Integrated Photonics Research, IPR 1994 ; Conference date: 17-02-1994 Through 17-02-1994",
year = "1994",
language = "English (US)",
series = "Optics InfoBase Conference Papers",
publisher = "Optica Publishing Group (formerly OSA)",
pages = "316--318",
booktitle = "Integrated Photonics Research, IPR 1994",
}