Novel lensed-fiber offset coupling scheme to reduce reflected intensity noise in optimizing carrier-to-noise ratio

Citation
Sk. Mondal et Fg. Shi, Novel lensed-fiber offset coupling scheme to reduce reflected intensity noise in optimizing carrier-to-noise ratio, OPT COMMUN, 199(5-6), 2001, pp. 399-405
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics
Journal title
OPTICS COMMUNICATIONS
ISSN journal
0030-4018 → ACNP
Volume
199
Issue
5-6
Year of publication
2001
Pages
399 - 405
Database
ISI
SICI code
0030-4018(200112)199:5-6<399:NLOCST>2.0.ZU;2-5
Abstract
Fiber-coupled laser diodes are indispensable for optical fiber communicatio ns. The design of laser-fiber coupling is often guided by maximizing the op tical power coupled into fiber, and by relaxing the fiber-laser alignment t olerances. Many of those fiber-optic designs are susceptible to optical bac k-reflections from the fiber resulting in not only a reduced coupling effic iency but also an increased optical noise of the signal. For many optical f iber communications, the most important parameter is not necessarily the co upling efficiency, but the quality of optical signal coupled into the fiber characterized by the carrier-to-noise ratio (CNR). This paper reports a no vel laser-fiber coupling design for the purpose of optimizing the CNR. This new design involves the use of an intentional offset between the lensed fi ber and laser. Though such offset has been studied previously in the contex t of coupling optics, it is never studied in the context of RIN and CNR. Th e results enable one to optimize the design of any laser-fiber coupling wit h respect to CNR. (C) 2001 Elsevier Science B.V. All rights reserved.