Mr. Xiaofeng Sun Profile

Xiaofeng Sun

at Tsinghua Univ

SPIE Involvement:

Author

Publications (2)

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 | 24 October 2017 Paper

Generation of picosecond optical pulse based on chirp compensation

Xiaofeng Sun, Jiaqian Yang, Shangyuan Li, Xiaoxiao Xue, Xiaoping Zheng, Bingkun Zhou

Proceedings Volume 10457, 104570Q (2017) https://doi.org/10.1117/12.2283125

KEYWORDS: Picosecond phenomena, Modulators

Read Abstract +

Picosecond optical pulses are widely used in optical communication systems, such as the optical time division multiplexing (OTDM) and photonic analog-to-digital converter (ADC). We have proposed and demonstrated a simple method to generate picosecond optical pulse using the mach-zehnder modulator (MZM), phase modulator (PM) and single model fiber (SMF). The phase modulator is used to generate a frequency chirp which varies periodically with time. The MZM is used to suppress the pedestal of the pulse and improve the performance of the pulse. The SMF is used to compensate the frequency chirp. We have carried out theoretical analysis and numerical simulation for the generation process of the picosecond optical pulse. The influence of phase shift between the modulation signals loaded on the MZM and PM is analyzed by numerical simulation and the conditions for the generation of picosecond optical pulse are given. The formula for calculating the optimum length of SMF which is used to compensate the linear chirp is given. The optical pulses with a repetition frequency of 10 GHz and a pulse width of 8.5 ps were obtained. The time-bandwidth product was as small as 1.09 and the timing jitter is as low as 83 fs.

Proceedings Article | 9 September 2002 Paper

Novel optical fiber flow sensor based on magnetic-field-induced displacement

Mao Liao, Jianmin Gong, Yanbiao Liao, Xiaofeng Sun

Proceedings Volume 4920, (2002) https://doi.org/10.1117/12.481953

KEYWORDS: Sensors, Magnetic sensors, Optical fibers, Fiber optics sensors, Magnetism, Camera shutters, Signal detection, Temperature metrology, Liquids, Electronics engineering

Read Abstract +

The paper reports a novel optical fiber fluid flow sensor which is based on the measurement of magnetic-field-induced displacement. This sensor can be used to achieve volumetric flow and mass flow as well. The mechanical part of the sensor is similar as that of conventional turbine flowmeter, except that the single turbine is replaced by a dual-turbine structure. The two turbines are connected with a spring, and their relative position is specially designed that, the rotation phase delay between the two turbines is proportional to the mass flow through the conduit. Two magnets are embedded in the two turbines respectively, and two magnetic field probes are used to measure the rotation phase of turbine by detecting the position of each magnet. The signals from the probes are transformed into light pulses by optical fiber shutter sensors and then transmitted to the central controlling room. A post processing unit receives the light signals, and then calculates out volumetric flow and mass flow value. Compared with other kinds of mass flowmeter, this sensor is rather cheap and inherently safe. Experimental results show that the error of less than I % could he achieved with this sensor.

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