Characterization of semiconductor laser frequency chirp based on signal distortion in dispersive optical fiber

2006 ◽  
Vol 14 (2) ◽  
Author(s):  
P. Krehlik
Keyword(s):  
Single Mode ◽  
Laser Frequency ◽  
Single Mode Fiber ◽  
Distributed Feedback ◽  
Parameters Estimation ◽  
Signal Distortion ◽  
Measuring Time ◽  
Simple Method ◽  
Laser Chirp

AbstractIn the paper, the simple method of laser chirp parameters estimation is presented. It is based on measuring time-domain distortions of chirped signal transmitted through dispersive fiber and finding laser chirp parameters by matching measured distortions to calculated ones. Experiments undertaken with 1.55 μm telecommunication grade distributed feedback (DFB) lasers and standard single-mode fiber are described, together with some practical remarks on measurement setup and main conclusions.

scholarly journals Characterization of small-signal intensity modulation of single-mode fiber grating Fabry-Perot laser source

2012 ◽  
Vol 19 (2) ◽  
pp. 64-70 ◽  
Author(s):  
Hisham Kadhum Hisham ◽  
Ahmad Fauzi Abas ◽  
Ghafour Amouzad Mahdiraji ◽  
Mohd Adzir Mahdi ◽  
Ahmad Shukri Muhammad Noor
Keyword(s):  
Signal Intensity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Intensity Modulation ◽  
Laser Source ◽  
Fiber Grating ◽  
Small Signal ◽  
Fabry Perot

Characterization of the train-average time–frequency parameters inherent in the low-power picosecond optical pulses generated by the actively mode-locked semiconductor laser with an external single-mode fiber cavity

Optik ◽  
2011 ◽  
Vol 122 (2) ◽  
pp. 136-141 ◽  
Author(s):  
Alexandre S. Shcherbakov ◽  
A.Yu. Kosarsky ◽  
Pedro Moreno Zarate ◽  
Joaquin Campos Acosta ◽  
Yurij V. Il’in ◽  
...  
Keyword(s):  
Low Power ◽  
Semiconductor Laser ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Optical Pulses ◽  
Time Frequency

scholarly journals Single Mode, Extreme Precision Doppler Spectrographs

2012 ◽  
Vol 8 (S293) ◽  
pp. 403-406 ◽  
Author(s):  
Christian Schwab ◽  
Sergio G. Leon-Saval ◽  
Christopher H. Betters ◽  
Joss Bland-Hawthorn ◽  
Suvrath Mahadevan
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Single Mode ◽  
Laser Frequency ◽  
Single Mode Fiber ◽  
Limiting Factor ◽  
Multimode Fiber ◽  
Line Spread Function ◽  
Order Of Magnitude ◽  
Novel Concept

AbstractThe ‘holy grail’ of exoplanet research today is the detection of an earth-like planet: a rocky planet in the habitable zone around a main-sequence star. Extremely precise Doppler spectroscopy is an indispensable tool to find and characterize earth-like planets; however, to find these planets around solar-type stars, we need nearly one order of magnitude better radial velocity (RV) precision than the best current spectrographs provide. Recent developments in astrophotonics (Bland-Hawthorn & Horton 2006, Bland-Hawthorn et al. 2010) and adaptive optics (AO) enable single mode fiber (SMF) fed, high resolution spectrographs, which can realize the next step in precision. SMF feeds have intrinsic advantages over multimode fiber or slit coupled spectrographs: The intensity distribution at the fiber exit is extremely stable, and as a result the line spread function of a well-designed spectrograph is fully decoupled from input coupling conditions, like guiding or seeing variations (Ihle et al. 2010). Modal noise, a limiting factor in current multimode fiber fed instruments (Baudrand & Walker 2001), can be eliminated by proper design, and the diffraction limited input to the spectrograph allows for very compact instrument designs, which provide excellent optomechanical stability. A SMF is the ideal interface for new, very precise wavelength calibrators, like laser frequency combs (Steinmetz et al. 2008, Osterman et al. 2012), or SMF based Fabry-Perot Etalons (Halverson et al. 2013). At near infrared wavelengths, these technologies are ready to be implemented in on-sky instruments, or already in use. We discuss a novel concept for such a spectrograph.

Simple method for manufacturing and optical characterization of tapered optical fibres

2016 ◽  
Vol 24 (4) ◽  
Author(s):  
A. Zakrzewski ◽  
A. Pięta ◽  
S. Patela
Keyword(s):  
Focal Length ◽  
Fdtd Method ◽  
Single Mode ◽  
Photonic Devices ◽  
Optical Fibres ◽  
Simple Method ◽  
Spot Diameter ◽  
Small Spot ◽  
Edge Method

AbstractPhotonic devices often use light delivered by a single-mode telecommunication fibre. However, as the diameter of the core of the optical fibre is of 10 microns, and the transverse dimensions of the photonic waveguides are usually micrometer or less, there is an issue of incompatibility. The problem may be solved by application of tapered optical fibres. For efficient light coupling, the taper should be prepared so as to create a beam of long focal length and small spot diameter in the focus. The article describes the design, fabrication and characterization of tapered optical fibres prepared with a fibre-optic fusion splicer. We modelled the tapers with FDTD method, for estimation of the influence of the tapered length and angle on the spot diameter and the focal length of an outgoing beam. We fabricated tapers from a standard single mode fibre by the Ericsson 995 PMfi- bre-optic fusion splicer. We planned the splicing technology so as to get the needed features of the beam. We planned a multistep fusion process, with optimized fusion current and fusion time. The experimental measurements of best tapered optical fibres were carried out by the knife-edge method.

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