Pieter Werner Hooijmans

Analytical analysis of IF-penalties for different FSK and CPFSK detection schemes

Due to the nonnegligible laser linewidth in coherent optical systems, IF bandwidths larger than the Nyquist signaling rate are required. This causes additional sensitivity penalties, which are evaluated for three types of coherent optical FSK (frequency-shift-keying) detection; two-filter-, delay-line discriminator-, and phase-diversity detection. Sensitivity as a function of the relative IF-bandwidth is given in a fully analytical form and confirmed by experimental measurements. >

Penalty free biphase linecoding for pattern independent FSK coherent transmission systems

Biphase coding is used to eliminate the unwanted influence of nonuniform laser characteristics in frequency-shift-keying (FSK) transmission systems. Compared to other (ternary) linecoding schemes, biphase has the advantage that it does not give a 3-dB sensitivity penalty when properly decoded in the receiver. This has been demonstrated in a 140-Mb/s 280-Mbaud transmission experiment. The receiver features a new type of reliable unambiguous clock extraction. Due to the compact IF spectrum, as compared with ternary linecoding schemes, biphase equipped FSK systems are especially suited for efficiently spaced coherent multichannel (CMC) systems. FSK heterodyne transmission experiments show a sensitivity eta P of -56.7 dBm for 2/sup 10/-1 pseudorandom patterns, only 4.8 dB from the shot-noise limit. >

RF front end application and technology trends

In this paper, we discuss the many issues around the system and circuit design of advanced RF front ends for mobile, wireless and consumer RF applications. After an analysis of the application trends, technology choices linked to the different systems solutions is discussed.

Why FSK and CPFSK have identical linewidth requirements

CPFSK is the most widely used modulation scheme in coherent optical transmission. Theoretical analyses so far predicted a much more stringent linewidth requirement compared to ASK and FSK systems with noncoherent IF-detection. In this paper we present a unified linewidth analysis of ASK, FSK, CPFSK, and DPSK receivers, with leads to the conclusion that the linewidth performance of these different schemes is to a large extent identical. The inclusion of post-detection filtering in the analysis is critical for obtaining these results, which are supported by practical system measurements on a 1 Gbit/s phase diversity CPFSK receiver. >

A new wide-band input compensation for packaged analog and digital multigigabit IC's

Packaging of multigigabit ICs introduces an input series inductance due to the bondwire which has a dominant influence on the overall IC performance. This paper describes the design and implementation of a novel input compensation circuit that both reduces the effects of the series inductance and offers the possibility to use an external termination with different impedances. Furthermore, a detailed theoretical investigation into the performance of the circuit is presented. A 7.4 Gb/s D-type flip-flop and a 4.2-GHz, 35-dB gain amplifier have been realized in a commercial 1-/spl mu/m silicon bipolar IC process with an average f/sub T/ of 11 GHz, showing the good performance of the input circuit. >

Fast channel acquisition in coherent multichannel receivers

Methods for very fast and reliable channel acquisition in coherent multichannel receivers are presented. This includes IF bandwidth switching for obtaining proper AFC pull-in signals, as well as local oscillator presetting with maximum drift tolerance. The resulting channel switching speed is 212 ms under all operational conditions.<<ETX>>

Coherent pictures of the future

The last five years have shown the rapid maturing of coherent optical communication, both in the development of essential components (especially the lasers) and the introduction of new system concepts. This new transmission technique is to play a vital role in the future broadband infrastructure of communications. It combines a higher transmission distance and a much larger capacity compared with all existing communication systems. Coherent optical communication is probably the only solution capable of dealing with the ever-increasing amount of data to be transmitted over the fibre-optical networks that have been introduced worldwide.

Coherent multichannel system for TV distribution with fast and direct channel selection

Coherent multichannel (CMC) systems employing optical frequency division multiplexing are known to make maximum use of the enormous potential bandwidth of single-mode fibers.1 We have built a CMC system with the potential of transmitting tens of channels to 8000 subscribers in a TV distribution (CATV) network. To evaluate the possibilities of fast and random channel selection essential for TV, we made a two-channel demonstrator. The optical TV receiver has a large tuning range and high sensitivity to allow a large number of subscribers.