טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentBloch Eli
SubjectMillimeter-Wave CMOS and InP Front-End ICs for Optical and
Wireless High Data-Rate Communication
DepartmentDepartment of Electrical Engineering
Supervisors Professor Dan Ritter
Dr. Eran Socher
Full Thesis textFull thesis text - English Version


Abstract

In the past decades the world network traffic has grown exponentially with a rate of 60%/year. As a result, an extensive research has been devoted to the improvement of the efficiency and the capacity of both optical and wireless communication channels.

Since 2008, optical coherent detection has started to gain a renewed interest mainly due to its potential to boost the spectral-efficiency when a full vector optical filed is detected. A significant progress in photonic integration, together with a constant growth in speed of integrated electronics have managed to decrease the loop delay of optical phase-lock-loops, resulting in sufficient phase-locking bandwidth relative to the local oscillator laser linewidth. Such optical phase-locked-loops based homodyne receivers pave the way to a coherent, high-speed, digital-signal-processing free short distance communication. The effort of this research is targeted to develop and design fast InP integrated circuits for optical phase locking. A Costas phase frequency detector featuring lasers detuning pull-in range of ±50 GHz was designed, manufactured and successfully tested. A work on homodyne BPSK and 100 GBaus/s QPSK receivers based on such Costas phase frequency detectors with two and four stable states, accordingly is also reported. A novel, fully digital, single-sideband mixer for offset locking is also introduced.

In the field of wireless communication, data rates of 10-20 Gbit/s can potentially be transmitted using 120 GHz band wireless links; a frequency region currently not used by industrial, scientific and medical applications, with a relatively small atmospheric absorption of about 1 dB/km. While most of the reported 120 GHz TX’s employ ASK modulations, in order to increase the data-rate and spectrum efficiency, quadrature coherent modulations must be used. The TX reported in this research utilizes a two mixing-steps scheme. The first stage is a high gain 40 GHz I/Q mixer based on a Weaver topology, while the second mixing stage upconverts to 120 GHz using a 80 GHz  LO, using the more available power levels at 80 GHz, compared with 120 GHz. The quadrature phases are generated using injection-locked frequency dividers at 40 GHz that use the same 80 GHz LO. This way, the design achieves a record data rate of 20.6 Gbit/s, wide frequency tuning range of 101-118 GHz and compact area of just 0.21 mm2.