Ultrahigh-speed Optical Communication Research Articles

Ultrahigh-speed InP/InGaAs DHPTs for OEMMICs

This paper presents an ultrahigh-speed InP/InGaAs double-heterostructure phototransistor (DHPT) with a record optical gain cutoff frequency of 82 GHz. This excellent performance originates from the double-heterostructure's compatibility with high-performance double-heterostructure bipolar transistor (DHBT) and a new self-aligned process. To demonstrate the excellent performance of the DHPT, two kinds of optoelectronic MMICs (OEMMICs) were designed and fabricated. One is a 40-GHz-band DHPT/DHBT photoreceiver that shows the DHPT's ability to be simultaneously integrated with a high-performance DHBT. The 40 GHz operation frequency is also the highest reported for monolithically integrated HPT/HBT photoreceivers. The other is a direct optical injection-locked oscillator that can extract an electrical clock signal from optical data streams. The OEMMICs are promising for compact and low-power-consumption optical receivers on an InP platform for millimeter-wave photonics and ultrahigh-speed optical communication systems.

Solitons for breaking barriers to terabit/second WDM and OTDM transmission in the next millennium

If an optical pulse has a self-waveform-stabilization effect, it would be very useful for high-speed communication and signal processing. An optical soliton governed by the nonlinear Schrodinger equation is such a pulse, as it balances the group velocity dispersion with the fiber nonlinearity self-phase modulation. We describe progress on ultrahigh-speed optical communication in the time (TDM) and frequency domains (WDM) using soliton effects. Especially, we describe 1-Tb/s WDM soliton transmission and 1.28-Tb/s optical TDM (OTDM) linear transmission, in which the soliton effects play important roles in making the experiment successful. These techniques help pave the path for optical technology of the next century.

Ultra high speed and high capacity optical communication

Ultra high speed and high capacity optical communication

Ultra high speed and high capacity optical communication

Ultra high speed and high capacity optical communication

Highly Stabilized Mode-Locked Semiconductor Diode Lasers.

Monolithic and external-cavity mode-locked diode lasers (Mode-Locked Laser Diodes: MLLDs) are highly stabilized by means of electrical or optical signal injection incorporating a compact device module packaging. These MLLDs have potential applications in ultrahigh-speed optical communication and optical measurement systems. The MLLDs developed fully satisfy the requirements in a light source for the optical time division multiplexing (OTDM) communication scheme at 100 Gb/s rate. Instead of electrical hybrid mode-locking, subharmonic optical pulse injection can stabilize the MLLD operating at over 100 GHz. This technology will be useful for the generation of millimeter and sub-millimeter electromagnetic waves with optoelectronic conversion. Another notable feature of highly stable MLLDs is to provide pump and probe optical measurements with a simple system excluding mechanical optical-delay, that is to say the optical sampling. This optical sampling enables to observe 100 Gb/s rate optical data eye-pattern as well as precise temporalresponse of optical materials.

Preface for Topical Papers on Ultrahigh Speed and Ultrahigh Capacity Optical Communication Technologies

Preface for Topical Papers on Ultrahigh Speed and Ultrahigh Capacity Optical Communication Technologies

Ultrashort Pulse Generation at High Repetition Rate from Mode-Locked Fiber Lasers.

A stable optical short pulse source with a high repetition rate is very important for realizing future ultrahigh speed optical communication. Of the many potential techniques, an actively mode-locked fiber laser is one of the most attractive sources for generating high quality picosecond pulses at GHz repetition rates. In this paper, we report a regeneratively mode-locked fiber laser which emits a 1-3 ps transform limited pulse at 10 GHz in the 1.53 to 1.55μm wavelength region. This laser can be locked to an external signal by operating a phase-locked loop technique. By using this pulse source and an adiabatic soliton compression technique, a 170 fs pulse train at 10 GHz was generated. Finally, we show the excellent jitter characteristics of the laser.