O. Mizuhara

A 5 Gb/s repeaterless transmission system using erbium-doped fiber amplifiers

A fully engineered 5 Gb/s repeaterless long-span transmission system with excellent long term performance is introduced. The transmitting power from an optical power booster was +15.5 dBm with SBS suppression, and an optical preamplifier receiver provided a receiver sensitivity of -38 dBm for 10/sup -9/ BER (or -35 dBm for 10/sup -15/ BER). A Ti:LiNbO/sub 3/ external modulator transmitter allowed dispersion limited repeaterless transmission through 226 km non-DSF (a total dispersion of 4100 ps/nm).<<ETX>>

Effect of transmitter speed and receiver bandwidth on the eye margin performance of a 10-Gb/s optical fiber transmission system

We calculated the effect of the transmitter speed and receiver bandwidth on the electrical eye margin performance of a 10-Gb/s NRZ optical fiber transmission system. The transmitter under consideration used a 1.5 /spl mu/m DFB-laser externally modulated by a zero-chirp LiNbO/sub 3/ modulator with NRZ, 2/sup 7/-1 PRBS data. The receiver was a pin-diode based direct detection receiver. Main results are (1) near optimum system performance is achieved when the 10-90% rise/fall-time of the transmitter output is 40 ps, only small improvement is obtained by using faster speeds and, (2) the optimum bandwidth of the receiver is at 10 GHz (the baudrate) for both the back-to-back and the 120-km transmission configuration. Thus, the optimum receiver bandwidth is at the baudrate (10 GHz) which is in conflict with accepted practice which suggests approximately 0.6/spl times/ baudrate (6 GHz). The reason for this discrepancy is that we considered an optically amplified NRZ transmission system where the optical power level at the receiver input is well above the receiver sensitivity. Therefore, the impact of thermal noise is negligible and the system is dominated by ISI, which can be reduced by increasing the receiver bandwidth.

10 Gb/s 150-km bidirectional repeaterless optical-fiber transmission

A successful 10-Gb/s bidirectional transmission experiment is demonstrated at the 1550-nm wavelength through 150 km of dispersion-shifted fiber. Long-term bit error rate performance (BER<10/sup -14/) is achieved in both transmission directions with a fully engineered system.<<ETX>>

Field demonstration of 10-Gb/s line-rate transmission on an installed transoceanic submarine lightwave cable

We report the successful field demonstration of 10 Gb/s NRZ line rate transmission on the installed TransPacific Cable (TPC-5) Segment G. Using prototype transmitters, receivers and a bit-synchronous 10-GHz polarization scrambler, we achieved long-term error-free transmission with a bit-error rate below 10 on a 4230-km-long installed fiber cable. We also obtained a bit-error-rate as low as 10/sup -15/ for 8460-km transmission. The measured Q-values for 4230-, 8460-, and 12 690-km transmission are 20, 16.5, and 12.5 dB, respectively.

REAP: recycled erbium amplifier pump

We report a novel erbium doped fiber preamplifier design with a combination of high gain (>40 dB) and low noise figure (3 dB) at 1556 nm for 80 mW of 980 nm pump power. The co-directional single pumped amplifier employs a composite two stage arrangement in which the second stage is pumped with recycled pump not used in the first stage. In addition, we contrast the amplifier performance trade-offs with the insertions of an isolator or a band pass filter or both in between the two amplifier sections. Finally, we demonstrate a receiver sensitivity of /spl minus/37 dBm (156 photons/bit) with a 10 Gb/s optical preamplifier regenerator.<<ETX>>

WDM transmission measurements on installed optical amplifier undersea cable systems

Summary form only given. Wavelength-division multiplexing (WDM) transmission tests have been performed on recently installed portions of the Trans-Pacific Cable (TPC-5) and Trans-Atlantic Cable (TAT-12) systems to determine the upgrade capability of the undersea plant for each system. Tests were performed at various transmission rates up to 30 Gbit/s and at distances up to 16800 km.

Field measurements of 10-Gb/s line-rate transmission on the Columbus-IIB submarine lightwave system

We report field measurements of virtually error-free transmission at 10 Gb/s line rate on the installed Columbus-IIB optically amplified submarine lightwave system. For 2100-km transmission an average experimental Q-factor of 18.8 dB was achieved. An eye margin (EM) of +80 mV at 10/sup -15/ bit-error-ratio (BER) was also measured. For 4200 km transmission the average experimental Q-factor was 16.0 dB. Implications for system operation at 10 Gb/s line rate are discussed.<<ETX>>

Field demonstration of 10 Gbit/s line-rate transmission on an installed transoceanic submarine lightwave cable

We report the successful field demonstration of 10 Gb/s NRZ line rate transmission on the installed TransPacific Cable (TPC-5) Segment G. Using prototype transmitters, receivers and a bit-synchronous 10-GHz polarization scrambler, we achieved long-term error-free transmission with a bit-error rate below 10 on a 4230-km-long installed fiber cable. We also obtained a bit-error-rate as low as 10/sup -15/ for 8460-km transmission. The measured Q-values for 4230-, 8460-, and 12 690-km transmission are 20, 16.5, and 12.5 dB, respectively.Summary form only given. In this paper we report on the successful field demonstration of 10-Gbit/s transmission on the newly installed TPC-5G section undersea cable. Using the same prototype 10-Gbit/s transmitters and receiver/regenerators as the ones used in a previous terrestrial field experiment, we have achieved long-term error-free transmission on a 4230-km long cable with a low bit-error-rate.

High-performance 980-nm EDFAs for repeaterless high-bit-rate optical transmission system

We describe the design and performance of single pump 980 nm pre and post Er3+ doped fiber amplifiers plug-in modules. We demonstrate the potential and robustness of these amplifiers in a 980 nm-based rack mounted repeaterless 5 Gb/s system with a 54 dB optical power margin system. Excellent long term bit error ratio measurements (< 10-14) are reported for various system configurations. In particular, error free transmission is obtained with suppression of stimulated Brillouin scattering through 60 km of non-dispersion fiber.