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A 128-GS/s 63-GHz-bandwidth 2:1 analog-multiplexer (AMUX) module has been developed for ultrabroadband digital-to-analog (D/A) conversion subsystems. The AMUX IC was fabricated using 0.5-μm-emitter InP HBTs, which have a peak ft and fmax of 290 and 320 GHz, respectively. The IC has a through bandwidth of 67 GHz. We developed an ultra-low-loss metal package equipped with G3PO (SMPS) connectors. The...
In this report, a differential linear amplifier for high-symbol-rate multilevel transmission is presented. We designed and fabricated the amplifier IC by using newly developed in-house 0.25-µm InP DHBT technology, which yields peak ƒt and ƒmax of over 400 GHz. This amplifier consists of lumped variable-gain amplifier and distributed output buffer for achieving large gain control range and ultra-broadband...
An ultra-broadband 2∶1 analog-multiplexer (A-MUX) module has been developed for optical communications systems with a high symbol rate. The A-MUX IC was designed and fabricated using in-house InP HBTs, which have a peak ft and fmax of 290 and 320 GHz, respectively. The A-MUX module has a through bandwidth of over 50 GHz and operates at a clock rate of up to 50 GHz, leading to 100-GS/s operation. Its...
A new architecture using a half-rate clock for pseudo-random-bit-sequence (PRBS) generator has been devised for high-speed and low-power operation. For proof of concept, a 27−1 PRBS generator IC was designed and fabricated with 290-GHz-fT InP HBT technology. The PRBS generator operates up to 100 Gbps with a low power consumption of 955 mW, leading to a record figure-of-merit of 1.42 mW·Gbps−1. This...
A static frequency divider and decision circuit have been designed and fabricated in a 290-GHz-fT InP HBT technology. The static frequency divider operates up to 70 GHz with core power consumption as low as 19.6 mW. The decision circuit, realized with a parallel-clock structure, achieves error-free operation up to 50 Gbps with power consumption of 142 mW. Both speed/power ratios are among the highest...
Correspondence analysis has been used in text mining to deepen global understanding on the characteristics of categorized accumulated textual information, and may lead to new knowledge discovery. However, difficulty in category classification for textual information remains. This article presents a new analysis method for higher education curriculum textual information utilizing corresponding analysis...
The National Institution for Academic Degrees and University Evaluation (NIAD-UE) is engaged in the awarding of academic degrees based on the accumulation of credits. These credits must be classified according to pre-determined criteria for the chosen disciplinary field by each applicant. This classification is checked by the sub-committees whose members are well-versed in the syllabus of each course...
Correspondence analysis is frequently utilized in data and text mining. It will deepen the global understanding on the characteristics of accumulated text information and may lead to new knowledge discovery. We have so far focused on the text information of higher education institution such as syllabus. We have conducted research on collecting and analysing such information, and also pursuing research...
30 GHz bi-directional fiber-fed wireless link is realized using an optically injection-locked self-oscillating HBT optoelectronic mixer as a harmonic frequency up-and down-converter. Bi-directional transmissions of 32 QAM data are successfully demonstrated.
Optoelectronic integrated circuits (OEICs) using InP double-heterojunction bipolar transistors (InP DHBTs) and a uni-traveling-carrier photodiode (UTC-PD) have been fabricated by a non-selective regrowth technique. We have successfully demonstrated 100-GHz operation of an optical-clock frequency-divider OEIC
Electrical PMD equalizer ICs for 40-Gbit/s transmission were developed using InP/InGaAs HBT technology. In experiments using a PMD emulator, these ICs exhibit good compensation for DGD of over 20 psec at 40 Gbit/s.
We propose real-time heterodyne imaging interferometry using the three-phase correlation image sensor (3PCIS). The 3PCIS produces temporal correlation between incident light intensity and three-phase reference signals at each pixel and outputs the results as images in every frame. This property enables simultaneous demodulation of amplitude and phase images of heterodyne interference within a single...
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