As the best candidate for wireless-access networks, radio-over-fiber (RoF) technology can carry a variety of business. It is necessary to provide differentiated services for different users, so the network needs to produce signals with different modulation formats and different frequencies. A reconfigurable RoF system based on a switch and tunable optical filter that can realize modulation format conversion and multiple frequency signal switching functions is designed. It has a good performance in terms of bit error rate and an eye diagram. The design can help to use radio frequency resources efficiently and make dynamic bandwidth resources controllable.
As an intrinsically surface-specific technique, Second Harmonic Generation (SHG) is widely used in the study of
interface in recent years. The SHG signals from the air/liquid interface of Rhodamine B and Sodium Dodecyl Benzene
Sulfonate (SDBS) aqueous solutions were obtained and analyzed, which demonstrate that the SHG signal intensity of
Rhodamine B is stronger than that of SDBS. Compared with one single solution, the SHG signal intensity of the mixed
aqueous solution of Rhodamine B and SDBS decreases. From the UV-VIS absorption spectrum of the two aqueous
solutions, it can be seen that Rhodamine B has an absorption peak closer to the second harmonic frequency. Therefore
the resonance of the second harmonic frequency with the frequency of the dipole transitions of the chromophore
considerably enhances the signal intensity. Furthermore, the hyperpolarizabilities of the molecules of Rhodamine B and
SDBS are calculated from first-principles, which reveal that the hyperpolarizability of Rhodamine B molecule is greater
than that of SDBS molecule. When they are mixed, molecules of Rhodamine B and SDBS gather together because
Rhadamine B molecule carries positive surface charge and SDBS is anionic surfactant, causing the decrease of the SHG
intensity of the mixed solution.
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.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.