Bipin Dama

Ultra-Low-Power Single-Polarization QAM-16 Generation Without DAC Using a CMOS Photonics Based Segmented Modulator

Long-haul communication systems are requiring more and more spectral efficiency as data rates increase. QAM-16 is a promising candidate for each wavelength in a Wavelength-Division Multiplexed (WDM) system, providing double the spectral efficiency of Quadrature Phase-Shift Keying (QPSK) and four times the spectral efficiency of traditional On-Off Keying (OOK). However, generation of QAM-16 signals can be complex, expensive, and power-hungry when electrical Digital-to-Analog Converters (DACs) are required. We have developed a QAM-16 modulator that precludes the use of an electrical DAC while simultaneously keeping the optical architectural complexity similar to that of a traditional In-phase/Quadrature (IQ) modulator. Using this modulator, we experimentally demonstrate single-polarization, back-to-back transmission, and homodyne detection of QAM-16 signals at rates up to 28.125 Gsymbols/s, resulting in single-polarization system per-wavelength bit rates up to 112.5 Gb/s. This would translate to dual-polarization system per-wavelength bit rates up to 225 Gb/s. This is done using a segmented modulator built on an ultra-low-power CMOS Photonics platform, allowing the modulator and drivers to consume less than 1 W of power.

Low-power MOS-capacitor based silicon photonic modulators and CMOS drivers

We present efficient MOS-capacitor based silicon photonic modulators driven by low-power CMOS inverter based driver ICs. Operating under the lumped-element approximation, modulation formats of NRZ, PAM, and QAM are demonstrated.

Silicon Photonic Modulator Based on a MOS-Capacitor and a CMOS Driver

We describe a silicon photonic optical modulator based on a MOS-capacitor and a low power 1V CMOS inverter-based driver IC. In an MZI configuration, this efficient modulator and driver IC combination can produce a 9dB extinction ratio at 28 Gbps, at a wavelength of 1310nm.

Silicon high speed modulator for advanced modulation: device structures and exemplary modulator performance

Fiber optics is well established today due to the high capacity and speed, unrivaled flexibility and quality of service. However, state of the art optical elements and components are hardly scalable in terms of cost and size required to achieve competitive port density and cost per bit. Next-generation high-speed coherent optical communication systems targeting a data rate of 100-Gb/s and beyond goes along with innovations in component and subsystem areas. Consequently, by leveraging the advanced silicon micro and nano-fabrication technologies, significant progress in developing CMOS platform-based silicon photonic devices has been made all over the world. These achievements include the demonstration of high-speed IQ modulators, which are important building blocks in coherent optical communication systems. In this paper, we demonstrate silicon photonic QPSK modulator based on a metal-oxide-semiconductor (MOS) capacitor structure, address different modulator configuration structures and report our progress and research associated with highspeed advanced optical modulation in silicon photonics

Experimental demonstration of ultra-low-power single polarization 56 Gb/s QAM-16 generation without DAC using CMOS photonics

We experimentally demonstrate back-to-back transmission of QAM-16 at 56 Gb/s over a single polarization, representing a dual polarization system link of 112 Gb/s, without using an electrical DAC, on a CMOS Photonics platform.

Demonstration of Optical Transmission at Bit Rates of Up to 321.4 Gb/s Using Compact Silicon Based Modulator and Linear BiCMOS MZM Driver

We have designed and tested a compact flip-chip assembly that combines the photonic and electrical functionality of a Silicon Photonic modulator and a SiGe BiCMOS MZM-driver. This forms a basis for low-cost advanced optical transceivers.

Small-size Silicon Photonic IQ modulator and low-power CMOS driver for next generation Coherent Transceivers

We report on the smallest Silicon Photonic modulator and lowest power Complementary Metal-Oxide-Semiconductor Mach-Zehnder Modulator (CMOS MZM) Driver for next generation Coherent Transceivers. Bit-Error-Ratio (BER) characterization of this device demonstrates comparable performance relative to a commercial Lithium Niobate (LN) modulator and capability of highperformance transmission for long-haul applications.