As the demand for increased bandwidth continues to grow, the implementation of 10 Gbit/s systems is underway and telecommunications companies are now beginning to see a need for 40 Gbit/s per channel. One of the key enablers for building such 40 Gbit/s systems is the availability of high bandwidth receivers. At 40 Gbit/s the fundamental tradeoff between the transit time limited bandwidth and the internal quantum efficiency for conventional surface illuminated PIN detectors makes them unsuitable. It is therefore necessary to employ a waveguide photodetector design. Many 40 Gbit/s systems employ return-to-zero transmission formats and polarization interleaving. This added complexity places additional demands on both the bandwidth and the polarization dependence of these detectors. The high demands placed on the detector design make an optoelectronic integrated circuit approach for the receiver very difficult to realize. In this paper, we will discuss a 40 Gbit/s receiver with a responsivity greater than 0.7 A/W and polarization dependence of less than 0.1 dB over the wavelength range from 1500 nm to 1620 nm. This receiver has a 3dB bandwidth of 40 Ghz, a conversion gain as high as 120 V/W, < 20 pA/(root) Hz input referred noise, < -7 dBm sensitivity, low deviation from linear phase, and a linear output swing greater than 0.8 V p-p.
The increasing demand on the capacity of the communication system is pushing the industry into more advanced development stage, especially true for SONET/SDH TDM 10Gb/s systems. In addition to the long haul network, there is a big interest in short distance, low cost system suitable for local ring architecture around Metropolitan area. In this talk, we investigate directly modulated 10Gb/s DFB laser based transmitters. Both 1.3 micrometer and 1.55 micrometer DFB lasers are evaluated, including uncooled lasers. Since most of the installed fiber in the U.S. is conventional, non-dispersion shifted fiber, we also focus on chirp induced dispersion penalty using the 1.55 micrometer laser. Their performance is compared with some externally modulated transmitters, and experiments are conducted for transmitting over non-dispersion shifted fiber.
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.
Conference Committee Involvement (1)
Optical Transmission, Switching, and Subsystems II
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