Dr. Zinan Wang Profile

Dr. Zinan Wang

at Peking University

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 23 August 2011 Paper

Line-width compression of the distributed feedback laser with an external parallel feedback cavity

Zi-nan Wang, Cui-yun Wang, Da-liang Wang, Ping Lu, Xiao-qi Yu, Lian-yu Xu, Yi Yang, Yun Jiang, Li-xin Zhu, Zheng-bin Li

Proceedings Volume 8192, 81923L (2011) https://doi.org/10.1117/12.900983

KEYWORDS: Fiber lasers, Multimode fibers, Single mode fibers, Interferometers, Optical amplifiers, Semiconductor lasers, Laser resonators, Laser development, Optical communications, Light sources

Read Abstract +

The distributed feedback laser (DFB) is a typical laser diode where the active region of the device is periodically structured as a diffraction grating. The output of a DFB laser has one single longitudinal mode and a relatively narrow line-width, usually several megahertz or one order less. However, applications such as coherent optical communication and accurate fiber sensing demand an even narrower line-width. An effective method for compressing a DFB laser is demonstrated. The line-width of a DFB laser, 200 KHz detected originally, is suppressed to sub kilohertz by adding an external parallel feedback cavity. The DFB laser is normatively designed but without the output isolator. The parallel feedback cavity is constructed by inserting several pieces of multimode fiber into a standard linear single-mode fiber cavity. In multimode fiber, each transverse mode has a different propagation constant. Equivalently, when a light beam propagates from single mode fiber to multimode fiber, it will split into a few parallel light paths with different propagation constants. The external cavity and DFB cavity form a compound resonant cavity for light beams. Lasing light in the compound cavity must fit the restrictions of all light paths, thus line-width of the final output is suppressed. When a passive external cavity is used, the line-width is suppressed to 1.25 KHz, detected by a delayed self-heterodyne interferometer with a 100km fiber delay line. By adding an erbium doped fiber amplifier (EDFA) into the external cavity for loss compensation, the result is updated to 430 Hz. This line-width suppressing method can be applied for other types of fiber lasers in a similar way. The parallel feedback mechanism is also suggested for general laser cavity designing to achieve ultra narrow line-width light source.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years