All-optical sampling for THz bandwidth signals

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Application Deadline
3/12/2018 11:59:00 PM Eastern Time Zone

Research Topic Description, including Problem Statement:

New optical communication paradigms such as super channels could push the bandwidth of optical signals to 10 THz and beyond. Physical layer processing (i.e., pre-, post-, and mid-span) may be able to reduce the burden on digital post processors even as the signal bandwidths advance. One physical layer technology that may be useful for nonlinear distortion mitigation is an all-optical sampler. The primary goal of this research is to prove the feasibility of using an all-optical sampler for managing the bandwidth of a nonlinear optical processor for signals with bandwidths of 1 THz to 10 THz and beyond. Issues such as dynamic range, in band ripple, insertion loss, noise, etc. should be identified and quantified.


Example Approaches:

A sampled optical signal can be generated at a convenient IF (intermediate frequency) by FWM (four wave mixing) with an optical comb, then lumped-element optical filtering may be used to mitigate nonlinear distortions. After nonlinear filtering, the sampled optical signal can be Nyquist filtered and coherently detected or optically heterodyned to an appropriate band for transmission. By keeping the signal in the optical domain, nonlinear impairments can be reduced while continuing to make use of powerful digital processing to mitigate linear impairments as is done for modern systems. Example existing efforts in this area include:

  • C. Xu and X. Liu, “Postnonlinearity compensation with data-driven phase modulators in a phase-shift keying transmission,” Opt. Lett., Vol. 27(18), pp. 1619-1621, September 2002.

  • X. Liu, X. Wei, R.E. Slusher, C.J. McKinstrie, “Improving transmission performance in differential phase-shift-keyed systems by use of lumped nonlinear phase-shift compensation,” Opt. Lett., Vol. 27(18), pp. 1616-1618, September 2002.

  • S, Radic, “Parametric Signal Processing,” IEEE J. Sel. Topics Quantum Electron., vol 18, no. 2, pp. 670-680, Mar./Apr. 2012.

  • E. Temprana, E. Myslivets, B.P.-P. Kuo, L. Liu, V. Ataie, N. Alic, and S. Radic, “Overcoming Kerr-induced capacity limit in optical fiber transmission,” Science, Vol 348 Issue 6242, pp. 1445-1448, 26 June 2015.

  • X. Liu, A.R. Chraplyvy, P.J. Winzer, R.W. Tkach, and S. Chandrasekhar, “Phase-conjugated twin waves for communication beyond the Kerr nonlinearity limit,” Nature Photonics, DOI: 10.1038/nphoton.2013.109, May 2013.


Postdoc Eligibility

  • U.S. citizens only
  • Ph.D. in a relevant field must be completed before beginning the appointment and within five years of the application deadline
  • Proposal must be associated with an accredited U.S. university, college, or U.S. government laboratory
  • Eligible candidates may only receive one award from the IC Postdoctoral Research Fellowship Program.

Research Advisor Eligibility

  • Must be an employee of an accredited U.S. university, college or U.S. government laboratory
  • Are not required to be U.S. citizens
Eligibility Requirements
  • Citizenship: U.S. Citizen Only
  • Degree: Doctoral Degree.
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