Thomas Swahn

A 165-Gb/s 4:1 multiplexer in InP DHBT technology

This paper presents a 4:1 multiplexer fabricated in InP DHBT technology. The multiplexer works up to 165 Gb/s. At 165 Gb/s, the chip operates at -3.2 V supply voltage and consumes 1.6 W. It is a half-rate multiplexer using a multi-phase clock architecture. The main design challenges were timing margins between clock and data.

InP-HBT chip-set for 40-Gb/s fiber optical communication systems operational at 3 V

A chip set for a 40 Gb/s fiber optical communication system has been designed and fabricated. On-wafer measurements have been performed to verify circuit operations. As far as available measurement capabilities show, all circuits are functionally fulfilling specifications for 10 Gb/s operation at less than or equal to 3 V supply voltage. During the design phase especially the influence of interconnects on signal integrity was investigated and the results were implemented for automatic extraction. All the circuits were operational after the first processing round. No redesign was necessary.

ICs for 100-Gb/s serial operation

Recently, research activities in the field of 100 Gb/s integrated circuits (ICs) for communication systems have increased. This article discusses an overview of the building blocks of a hypothetical 100-Gb/s serial transmission system and points out some important aspects of such building blocks. Several key building blocks for a 100-Gb/s serial transceivers are also demonstrated. Some pioneering 100-Gb/s ICs designed through various enabling semiconductor technologies are presented as well.

A 100-Gb/s 1:4 Demultiplexer in InP DHBT Technology

This paper presents a 1:4 demultiplexer fabricated in InP DHBT technology. The demultiplexer is verified to work up to 100 Gb/s at a supply voltage of -3.6 V consuming 2.1 W. It is a half-rate demultiplexer using multi-phase clock architecture. To verify operation up to 100 Gb/s the authors used an in-house PRBS generator chip

A 14 Gbps On-/Off- Keying Modulator in GaAs HBT Technology

A proof of concept on-/off- keying (OOK) modulator is designed and implemented in a commercial heterojunction bipolar transistors IC process. The modulator circuit consists of an amplifier/latch structure, which is used as an OOK modulator for the first time. One of its advantages is that the topology may be implemented in both field effect transistor and bipolar technology. The measurement results correspond well with simulation and show that the modulator is capable of handling carrier frequencies up to 28 GHz, and data rates up to 14 Gbps. The isolation of the modulator in the off-state is better than 27 dB over the whole frequency range.

104Gb/s 2"-1 and 110Gb/s 2-1 PRBS Generator in InP HBT Technology

A 211-1 PRBS generator with one output at a maximum data rate of 104Gb/s and 4 parallel outputs at 52Gb/s is presented together with a 29-1 PRBS generator with a single output at 110Gb/s. The ICs are implemented in a 300GHz fT InP HBT technology. The generator core is clocked at half the data rate of the high-speed output for both circuits. They dissipate 2.8W and 2.2W from a -3.5V supply, respectively

Design and Test of InP DHBT ICs for a 100 Gb/s Demonstrator System

We report on design and test of state-of-the-art building blocks for a 100 Gb/s demonstrator system: a 165 Gb/s 4:1 multiplexer IC and a 110 Gb/s PRBS generator IC in InP DHBT technology.

Field Trial of Polarization-Assisted Optical Performance Monitoring Operating in an 820 km WDM System

We report a comprehensive optical performance monitoring field trial. A low-cost monitoring solution operates in an 820-km installed WDM transmission link at nine link points. The monitoring includes power, wavelength, SOP, OSNR, and first-order PMD.

A data-rate adaptable modem solution for millimeter-wave wireless fronthaul networks

For dense small cell deployment in centralized baseband architecture, wireless fronthaul is a cost efficient and flexible alternative to fiber-based fronthaul links. Due to the available wide bandwidth, millimeter-wave technology is the most promising choice to realize multi-gigabit wireless transmission of the common public radio interface (CPRI). In this paper, we present a novel differential encoding scheme for differential quadrature phase-shift keying (D-QPSK) modulation, which enables data-rate adaptable CPRI transmission without modification of a standard receiver. A multi-rate D-QPSK modulator/demodulator (modem) is implemented and tested for data rates up to 10 Gbps, limited by the bandwidth of the microwave components in use. This modem is verified to fulfill the CPRI specifications with respect to multi-rate, low latency and high system performance. Therefore, it is proposed for the implementation of wireless CPRI links at millimeter-wave bands.

Flip-chip mounted 1:4 demultiplexer IC in InP DHBT technology operating up to 100 Gb/s

Operation of a packaged 1:4 demultiplexer (DEMUX) in InP DHBT technology for an input data rate of up to 100 Gb/s is presented. The DEMUX IC is flip-chip mounted in a microwave package consisting of an aluminum nitride substrate with coplanar waveguides placed in a Kovar/MoCu housing with coaxial V-connectors. The DEMUX was operated at a supply voltage of -3.5 V and consumes 2.1 W.