OTDM Demultiplexing Research Articles

Optical switch based on nonlinear one dimensional photonic band gap material

In this paper we proposed an optical switch based on nonlinear one dimensional photonic band gap material. Polystyrene and SiO2 have been chosen as constituent materials for the proposed optical switch. Propagation of optical waves through these multilayered structures has been studied for different intensities. Simulation of the device and analysis of its performance has been carried out using transfer matrix method. The study shows that the polystyrene/SiO2 based nonlinear photonic band gap material studied here can work as an optical switch. The proposed device could also be useful in OTDM demultiplexing, all optical information processing, etc. Due to its simple geometric structure and simple operating principle, this device could be a strong candidate for the variety of applications in the field of integrated optoelectronics.

Single-channel 5.12 Tbit/s (1.28 Tbaud) DQPSK transmission over 300 km using non-coherent Nyquist pulses.

We present a single-channel 5.12 Tbit/s polarization-multiplexed DQPSK transmission over 300 km at 1.28 Tbaud using a non-coherent Nyquist pulse. An ultrafast OTDM demultiplexer for 1.28 Tbaud Nyquist pulses was newly developed with a mode-locked fiber laser operating in the L band as a control pulse source. Thanks to the high PMD tolerance of Nyquist pulses, a 300 km transmission was successfully demonstrated for the first time at such a high symbol rate.

Ultralow-power all-optical processing of high-speed data signals in deposited silicon waveguides

Utilizing a 6-mm-long hydrogenated amorphous silicon nanowaveguide, we demonstrate error-free (BER < 10(-9)) 160-to-10 Gb/s OTDM demultiplexing using ultralow switching peak powers of 50 mW. This material is deposited at low temperatures enabling a path toward multilayer integration and therefore massive scaling of the number of devices in a single photonic chip.

Polarization-Insensitive 640 Gb/s Demultiplexing Based on Four Wave Mixing in a Polarization-Maintaining Fibre Loop

Polarization-insensitive 640 Gbit/s demultiplexing for OTDM data signals is demonstrated using a 100 m polarization-maintaining highly non-linear fibre. The scheme is based on four wave mixing (FWM) in a polarization-maintaining fibre loop (PMFL) with bidirectional operation. Less than 0.2 dB polarization dependence is obtained. The FWM efficiency is about -6 dB if the passive loss of the PMFL is not included. The flatness characteristic of the FWM efficiencies allows for the OTDM demultiplexing of a high speed signal with a bandwidth of 1.2 THz. Error free performance with low penalty for the demultiplexed 10 Gbit/s signal is achieved for the polarization scrambled 640 Gbit/s data signal. BER measurements and eye-diagrams show that the demultiplexed 10 Gbit/s signals with and without polarization scrambling have almost identical performance.

Serial OTDM for 100 Gbit-Ethernet applications

A novel transmitter for 100 Gbit-Ethernet applications is proposed, based on the serial cascade of two 50 Gbit/s inverse-return-to-zero (also known as dark soliton) transmitters based on Mach-Zehnder modulators. The proposed transmitter and demultiplexer system uses commercially available components optimised for 40 Gbit/s applications. A 2.9 dB penalty at 100 Gbit/s is obtained using a single-stage OTDM demultiplexer and a preamplified receiver.

Low power penalty 80 to 10 Gbit/s OTDM demultiplexer using standing-wave enhanced electroabsorption modulator with reduced driving voltage

Low power penalty 80 to 10 Gbit/s demultiplexing using a novel standing-wave enhanced electroabsorption modulator is reported. In this new design, an electrical standing-wave pattern is formed deliberately along the travelling-wave electrodes, reducing the driving voltage required for high-speed demultiplexing.

O-TDM demultiplexer with 40-dB gain based on a fiber optical parametric amplifier

We demonstrate a broad-band time-division demultiplexer with inherent gain based on selective amplification in a fiber optical parametric amplifier. The parametric amplifier is pumped by a CW light source being sinusoidally intensity modulated by an optical Mach-Zehnder modulator. A switching window between 10% and 18% of the modulation period is measured over a 39 nm wavelength range with a demultiplexed fiber gain of up to 40 dB. Four-wave mixing based demultiplexing without wavelength conversion was achieved due to the high parametric gain. Bit-error-rate measurements show error-free demultiplexing at 40 to 10 Gb/s.

Simultaneous two-channel OTDM demultiplexing using a single electroabsorption modulator in a novel bi-directional configuration

A single electroabsorption modulator was used to simultaneously demultiplex two 10 Gbit/s channels from a 40 Gbit/s OTDM data stream. Error-free operation was observed, and the effects of incoherent interference between the demultiplexed channel and residual facet reflections investigated.