Abstract

A new tunable optical delay line for OTDM applications can achieve sub-nanosecond tuning time across three time slots spaced 100ps apart. Using parallel fiber delays, the delay line requires only one modulator operating below the baseband data rate. A simple control algorithm based on a latency diagram can further reduce the average latency beyond that of the straightforward hardware implementation by 50%. Using the demonstrated delay line, 10 GHz electronics has the potential to access a throughput of 160Gb/s optical data.

© Optical Society of America

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References

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  1. S. Kawanishi, I. Shake, and K. Mori, "3 Tbits/s (160 Gbits x 19 ch) OTDM/WDM Transmission Experiment," in Optical Fiber Communication Conference, (Optical Society of America, Washington, D.C., 1999) PD-1.
  2. K. L. Deng, R. J. Runser, P. Toliver, C. Coldwell, D. Zhou, I. Glesk and P. R. Prucnal, "Demonstration of a highly scalable 100-Gbps OTDM computer interconnect with rapid inter-channel switching capability," Electronic. Letters. 34, 2418-2419 (1998)
    [CrossRef]
  3. R. Taylor and S. Forrest, "Steering of an Optically Driven True-Time Delay Phased-Array Antenna Based on a Broad-Band Coherent WDM architecture," IEEE Photonics Technology Letters. 10, 144-146 (1998)
    [CrossRef]
  4. K. L. Hall, D. T. Moriarty, H. Hakmi, F. Hakimi, B. S. Robinson, and K. A. Rauschenbach, "Ultrafast Variable Optical Delay Technique," LEOS 1999, p208
  5. K. L. Deng, K. I. Kang, I. Glesk, P. R. Prucnal, "A 1024-Channel Fast Tunable Delay Line for Ultrafast All-Optical TDM Networks," IEEE Photonics Technology Lett. 9, 1496-1498 (1997)
    [CrossRef]

Other (5)

S. Kawanishi, I. Shake, and K. Mori, "3 Tbits/s (160 Gbits x 19 ch) OTDM/WDM Transmission Experiment," in Optical Fiber Communication Conference, (Optical Society of America, Washington, D.C., 1999) PD-1.

K. L. Deng, R. J. Runser, P. Toliver, C. Coldwell, D. Zhou, I. Glesk and P. R. Prucnal, "Demonstration of a highly scalable 100-Gbps OTDM computer interconnect with rapid inter-channel switching capability," Electronic. Letters. 34, 2418-2419 (1998)
[CrossRef]

R. Taylor and S. Forrest, "Steering of an Optically Driven True-Time Delay Phased-Array Antenna Based on a Broad-Band Coherent WDM architecture," IEEE Photonics Technology Letters. 10, 144-146 (1998)
[CrossRef]

K. L. Hall, D. T. Moriarty, H. Hakmi, F. Hakimi, B. S. Robinson, and K. A. Rauschenbach, "Ultrafast Variable Optical Delay Technique," LEOS 1999, p208

K. L. Deng, K. I. Kang, I. Glesk, P. R. Prucnal, "A 1024-Channel Fast Tunable Delay Line for Ultrafast All-Optical TDM Networks," IEEE Photonics Technology Lett. 9, 1496-1498 (1997)
[CrossRef]

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Figures (4)

Fig 1.
Fig 1.

Schematic for the tunable parallel optical fiber delay line. MOD: modulator

Fig. 2.
Fig. 2.

Timing Diagram of the parallel delay line

Fig 3.
Fig 3.

Latency Diagram

Fig. 4
Fig. 4

The output of the parallel delay line for three time slots are shown on two time scales. Dashed lines are 300ps apart in figure 4a. Figure 4b shows the output from the delay line on a longer time scale. The dashed lines in figure 4b are 400ps apart.

Tables (1)

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Table 1. A comparison between the parallel and the serial delay line strucutres

Equations (3)

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S in ( t ) = i = 0 N 1 p ( t ) G i
S out ( t ) = 1 N + 1 j = 0 N S in ( t jT )
S out ( t ) = 1 N + 1 j = 0 N i = 0 N 1 p ( t jT ) G i

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