The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Vital signs (including breath and heartbeat) monitoring is a key tool in healthcare. Current monitors need invasive electronic sensors attached to user's body, which is inconvenient and uncomfortable. We demonstrate photonic smart health monitoring system based on phase-sensitive optical fiber interferometers. Users simply lie/sleep on a sensor mat embedded with optical fiber interferometers. Breath...
A novel intensity-modulated fiber-optic refractive index (RI) and strain sensor based on modal interferometer (MMI) is proposed. The sensing mechanism is mainly based on the Mach-Zehnder interferometer (MZI) constructed by one down taper spliced between dual up tapers on the single mode fiber (SMF). High-order cladding modes are efficiently excited owing to the mismatch of the mode filed diameter...
We evaluate the possibility of realizing optical access networks using 1.5-μm vertical-cavity surface-emitting lasers (VCSELs) in the on-off keying (OOK) and four-level pulse amplitude modulation (4-PAM) formats. In order to maximize the power budget of the networks, we optimize the extinction ratio of the 10.7- and 21.4-Gb/s signals and exploit the electrical equalization at the receiver. The experimental...
We investigate the transmission performance of 21.4-Gbps 4-PAM signals generated by using a 1.54-µm VCSEL. We achieve >8-dB power budget after 15-km transmission over SSMF by optimizing the extinction ratio and utilizing electronic equalization.
Implementation of advanced DSP algorithms like back-propagation (BP) for coherent communication systems requires detail knowledge of the transmission link configurations. We demonstrate the use of pilot symbols to monitor fiber nonlinear parameters, number of spans as well as OSNR of a transmission link.
We propose pilot decision-aided maximum likelihood phase estimation for nonlinear-phase-noise-dominant coherent optical phase-shift-keying (PSK) systems. The receiver sensitivity is shown to be improved by ~1 dB compared to the differentially encoded PSK counterparts.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.