Near field diffraction of phase-shifted phase grating for side-writing fiber Bragg gratings

Yunlong Sheng; Li Sun; Joshua E. Rothenberg; Hongpu Li; Ying Wang

doi:10.1117/12.667703

20 January 2006 Near field diffraction of phase-shifted phase grating for side-writing fiber Bragg gratings

Yunlong Sheng, Li Sun, Joshua E. Rothenberg, Hongpu Li, Ying Wang

Proceedings Volume 6027, ICO20: Optical Information Processing; 602707 (2006) https://doi.org/10.1117/12.667703
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

The fiber Bragg grating (FBG) with a very high count, up to N=80, identical channels for dispersion compensators has been commercialized. The design utilizes the phase-only sampling, which requires η / N time higher refractive index modulation than the N times required by the amplitude sampling design. The phase sampling is implemented by inserting phase shifts in the FBG. Hence, the positive valued coupling coefficients of the FBG become complex-valued, which greatly increase the functionality and spectral performance of the FBG. In the fabrication of the phase-shifted FBG we find that the phase shifts in the phase mask for writing the FBG are not replicated into the FBG, as believed by many people, but are split into two half-magnitude phase-shifts due to the near field diffraction. We show the split of the phase shift by using the Finite Difference in Time Domain (FDTD) analysis and we show that this split of the phase shifts results in the FBG spectral asymmetry by a physical model of the phase-only sampling function distortion and by the FBG experiments. The new pre-compensating phase mask technique is introduced to remove the errors and therefore ensure the success of the high count multiple channel FBGs.

Citation Download Citation

Yunlong Sheng, Li Sun, Joshua E. Rothenberg, Hongpu Li, and Ying Wang "Near field diffraction of phase-shifted phase grating for side-writing fiber Bragg gratings", Proc. SPIE 6027, ICO20: Optical Information Processing, 602707 (20 January 2006); https://doi.org/10.1117/12.667703

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Fiber Bragg gratings

Phase shifts

Photomasks

Diffraction gratings

Phase shift keying

Finite-difference time-domain method

Near field diffraction

Show All Keywords

Keywords/Phrases

Search In:

Publication Years