NDLI: Flattop Efficient Cascaded χ<formula formulatype=inline><tex Notation=TeX>$^{bf {bm (}2{bm)}}$</tex> </formula> (SFG + DFG)-Based Wideband Wavelength Converters Using Step-Chirped Gratings

Content Provider	IEEE Xplore Digital Library
Author	Tehranchi, A. Kashyap, R.
Copyright Year	1995
Abstract	We numerically evaluate efficient wideband wavelength converters based on quasi-phase-matched cascaded sum and difference frequency generation (SFG + DFG) using step-chirped gratings (SCG) in lossy lithium niobate waveguides, and compare them to the ones using uniform gratings, assuming a large pump wavelength difference considering a full model of depleted pump and sum-frequency waves. For the same length, appropriate critical period shifts are presented for the number of sections and chirp steps to achieve flattop conversion efficiency responses with peak-to-peak ripples less than 0.2 dB. To obtain the maximum efficiency and flat response with a decreasing chirp step of 1 nm, the criteria for the design of optimum four-section single-pass and two-section double-pass SCG-based devices, including the assignment of length (to achieve a desired bandwidth) and pump power, are presented considering a 75-nm pump wavelength difference. Also, the performances of single-pass and double-pass schemes for the two- and four-section SCG-based devices are given, respectively, and compared to those of uniform grating-based devices with and without pump detuning, assuming a 3-cm-long waveguide and 50-mW input pump powers. For the same length and power, using the SCG with fixed pumps instead of the uniform grating with detuned pumps shows a noteworthy increase in the mean efficiency to attain almost the same response flatness and bandwidth.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	785
Ending Page	793
Page Count	9
File Size	1451506
File Format	PDF
ISSN	1077260X
Volume Number	18
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gratings Chirp Bandwidth Frequency conversion Optical waveguides Optical wavelength conversion Fabrication wavelength converter Conversion efficiency cascaded sum and difference frequency generation (SFG $+$ DFG) nonlinear-optical devices quasi-phase-matching (QPM)
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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