Real-Time Transmission Measurements from 200 Gb/s to 600 Gb/s over Links with Long 122 km Fiber Spans

We present results for real-time coherent transmission with data rates from 200 Gb/s to 600 Gb/s in 50 Gb/s increments over a re-circulating loop with 122 km spans of ultra-low loss, large effective area fiber.