Ariya Hidayat

5.94-Tb/s 1.49-b/s/Hz (40/spl times/2/spl times/2/spl times/40 Gb/s) RZ-DQPSK polarization-division multiplex C-band transmission over 324 km

The combination of return-to-zero differential quadrature phase-shift keying with polarization-division multiplex, a 16-ary modulation scheme, allows for ultimate spectral efficiency. We raise C-band fiber capacity with phase-shift keying transmission beyond previously reported figures, achieving forward-error correction limit performance over four fiber spans.

1.6-b/s/Hz 160-Gb/s 230-km RZ-DQPSK polarization multiplex transmission with tunable dispersion compensation

A 160-Gb/s (4/spl times/40 Gb/s) return-to-zero differential quadrature phase-shift keying polarization-division multiplex transmission is demonstrated with Q>15.6 dB in one of eight 100-GHz-spaced wavelength-division-multiplex channels after 230 km of fiber. Residual chromatic dispersion (CD) is equalized by a thermally tunable CD compensator for the 192.5-THz channel. Polarizations, in-phase and quadrature data channels are demultiplexed using a LiNbO/sub 3/-based automatic polarization control and a 1-bit interferometer, respectively.

Optical Endless Polarization Stabilization at 9 krad/s With FPGA-Based Controller

We demonstrate endless polarization stabilization with a control speed of up to 9 krad/s, over random Poincare sphere trajectories. These are in total >35 Mrad long, are composed in particular of difficult-to-track circles with all radii and orientations, and thereby include all possible worst cases. The maximum polarization mismatch and relative intensity errors are 0.13 rad and 0.43%, respectively. The controller runs on a field-programmable gate array and uses a commercial multistage LiNbO3 polarization transformer as the control device.

High-speed endless optical polarization stabilization using calibrated waveplates and field-programmable gate array-based digital controller.

A truly endless polarization stabilization experiment with a tracking speed of 15 krad/s is presented. The high-speed polarization tracking is realized by using calibrated lithium niobate linear retardation waveplates as the polarization transformers combined with a very fast digital controller running on a field-programmable gate array (FPGA).

38-krad/s 3.8-Grad Broadband Endless Optical Polarization Tracking Using LiNbO

We demonstrate automatic endless optical polarization tracking over 3.8 Grad at up to 38-krad/s control speed with mean/maximum polarization errors of 0.068/0.185 rad. Without polarization fluctuations, mean/maximum polarization errors are 0.05/0.1 rad. Small-signal control time constant is about 2 mus. Function is maintained over the wavelength range 1505-1570 nm.

_{3}

A commercial LiNbO3 polarization transformer is used to track, for the first time, worst-case endless 7 krad/s (5 krad/s) polarization fluctuations caused by rotating waveplates, with maximum intensity losses <;2% (<;0.8%).

Device

Full-band 1.6-Tb/s adaptive chromatic dispersion compensation is demonstrated for the first time. A multichannel tunable dispersion compensator is automatically controlled by arrival time detection on one out of 40 wavelength-division-multiplexed transmitted channels.

Fast Optical Endless Polarization Tracking with LiNbO 3 Component

We demonstrate an FPGA-based control system which compensates random polarization changes with a fluctuation speed of up to 12 krad/s. Endless and uninterruptible behavior is confirmed. The residual polarization mismatch remains below 0.16 rad.

1.6-Tb/s (40/spl times/40 Gb/s) transmission over 44,...,94 km of SSMF with adaptive chromatic dispersion compensation

160-Gb/s WDM transmission over 100-km EDFA-span is presented, which is achieved without Raman amplification and proper dispersion management. This DQPSK and PolDM based system has eight times better tolerance to chromatic dispersion than ETDM system.

12 krad/s endless polarization stabilization with lithium niobate component

In this paper, we investigate the capacity limit of colourless slope-matched tunable dispersion compensator based on Fiber Bragg grating technology. This compensator was initially designed for 10 Gbit/s operation with a channel bandwidth of at least 35 GHz. The compensator performance was assessed on a 40 channel, 2x2x40 Gbit/s DQPSK system, without and with polarization division multiplexing, which yield total raw data rate of 3.2 and 6.4 Tbit/s respectively. The compensator settings ranged between -700 (41.5 km SSMF) and about -1200 ps/nm (73.8 km SSMF). The measured Q factors of all channels are all above the FEC limit, equivalent to quasi error-free net capacities of 5.94 Tbit/s.