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.
A design for a receiver that directly converts PPM pulse positions into bit sequences for arbitrary M and data rate is described in this paper. The design is enabled by lossless splitters based on EDWA/PLCs.
C/PPS is a flexible multibit per symbol modulation format. It has the same architecture as PPM, but has greater bandwidth efficiency. It can utilize a code set to maximize the data rate of a particular user or distribute its codes to various users at different data rates. In the latter case, it is important to consider the associated effects on QoS. C/PPS is less sensitive to synchronization than...
An architecture for code/pulse position swapping (C/PPS) is described, whereby code modulation replaces traditional pulse position modulation (PPM). The architecture supports M-ary signaling, multiple accessing, throughput vs. QoS trade-offs, and granular data rates.
In this paper, we extend these photonic process techniques to a 16-ary, 12.5 Gb/s (10 Gb/s plus 8B/10B line coding) PPM communications system for fiber optic avionics, wherein much of the receiver processing is enabled by techniques based on planar lightwave circuits (PLCs). The architecture is applicable to higher input data rates and M-ary PPM. In the following, we present the PPM encoding and decoding...
An O-CDMA system utilizing 4-ary pulse position modulation and a novel virtual quadrant receiver is described. Bit-error-rates show the impact of multiple access interference, as influenced by its proximity to the correctly decoded signal.
640 GHz chirped beat waves are recorded on a real-time scope and 2.2 ps pulses are recorded on a single-shot streak camera with 1000:1 dynamic range after -30times time magnification.
We described the concept, numerical simulation, and physical implementation of a virtual quadrant receiver for 4-ary PPM/O-CDMA. The simulations show the joint impact of MAI and OBI on the receiver output (constellation plot). The receiver operation was demonstrated with a physical implementation that can be ultimately integrated as a PLC-based device.
Parametric temporal imaging enables real time transformation of ultrafast waveforms to a time scale accessible by convention recording instruments. Principles and the development of this technology will be reviewed along with recent experimental results.
We propose a virtual quadrant receiver for 4-ary PPM/O-CDMA. Numerical simulations determine the impact of multi-access interference and optical beat interference on correct symbol detection versus the number of concurrent, asynchronous users.
Guided-wave parametric temporal imaging is demonstrated with 1.8 ps resolution and 1000:1 dynamic range. Waveforms are - 30.1 x time magnified before recording single-shot on a streak camera, and on a real-time oscilloscope repeating at MHz rates.
Summary form only given. If two mode-locking mechanisms are combined such that one operates at the fundamental frequency and one at a harmonic, the benefits of shorter pulses at low repetition rates will be preserved. Towards this end we report here on simultaneous Nd:YAG laser mode-locking of fundamental AM and harmonic FM laser modulation.
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.