| 1. |
- Ellis, A. D., et al.
(author)
-
Future Directions to Realize Ultra-High Bit-Rate Transmission Systems
- 2010
-
In: Proceedings of OptoElectronics and Communications Conference, OECC 2010, Sapporo, Japan, 5-9 July 2010, invited paper..
-
Conference paper (other academic/artistic)abstract
- In this paper we examine two potential future directions for the realization of ultra-high bit rate transmission systems.
|
|
| 2. |
- Kakande, Joseph, et al.
(author)
-
Detailed characterization of a
fiber-optic parametric amplifier in phase-sensitive and phase-insensitive operation
- 2010
-
In: Optics Express. - 1094-4087 .- 1094-4087. ; 18:5, s. 4130-4137
-
Journal article (peer-reviewed)abstract
- We experimentally demonstrate a single-pumped, non-degenerate phase-sensitive parametric amplifier with a precise control of phase and amplitude of the in-going waves and investigate in detail its gain, attenuation and saturation properties in comparison with operation in phase insensitive amplifier (PIA) mode. We experimentally observe the variation of the gain and attenuation as a function of the relative phase, pump power and the signal-idler power ratio. The phase sensitive gain spectrum is studied over a 24 nm symmetrical bandwidth and we achieve a maximum phase sensitive amplification (PSA) gain of 33 dB. A departure from the theoretical maximum attenuation as the gain increases is observed and explained.
|
|
| 3. |
- Lee, Kwang Jo, et al.
(author)
-
Phase sensitive amplification based on quadratic cascading in a periodically poled lithium niobate waveguide
- 2009
-
In: Optics Express. - 1094-4087. ; 17:22, s. 20393-20400
-
Journal article (peer-reviewed)abstract
- We propose and demonstrate phase-sensitive amplification based on cascaded second harmonic generation and difference frequency generation within a periodically poled lithium niobate waveguide. Excellent agreement between our numerical simulations and proof-of-principle experiments using a 3-cm waveguide device operating at wavelengths around 1550 nm is obtained. Our experiments confirm the validity and practicality of the approach and illustrate the broad gain bandwidths achievable. Additional simulation results show that the maximum gain/attenuation factor increases quadratically with input pump power, reaching a value of +/- 19.0dB at input pump powers of 33 dBm for a 3 cm-long waveguide. Increased gains/reduced powers for a fixed gain could be achieved using longer crystals.
|
|
| 4. |
- Liu, Sheng, et al.
(author)
-
Phase-regenerative wavelength conversion in periodically poled lithium niobate waveguides
- 2011
-
In: Optics Express. - 1094-4087. ; 19:12, s. 11705-11715
-
Journal article (peer-reviewed)abstract
- We propose and experimentally demonstrate phase-regenerative wavelength conversion in periodically poled lithium niobate waveguides, using either: a single-stage implementation based on a simultaneous combination of two cascaded second-order nonlinear effects in a single periodically poled lithium niobate waveguide, or a two-stage implementation where two separate devices are used in sequence to give rise to the same nonlinear effects. The phase regeneration properties of the proposed wavelength conversion schemes are also investigated.
|
|
| 5. |
|
|
| 6. |
- Parmigiani, Francesca, et al.
(author)
-
All-Optical Phase Regeneration of 40Gbit/s DPSK Signals in a Black‐Box Phase Sensitive Amplifier
- 2010
-
In: 2010 Conference on Optical Fiber Communication, Collocated National Fiber Optic Engineers Conference, OFC/NFOEC 2010; San Diego, CA; United States; 21 March 2010 through 25 March 2010. - 9781557528841 ; , s. PDPC3-
-
Conference paper (peer-reviewed)abstract
- We present a black‐box four wave mixingbased bit‐rate‐flexible phase sensitive amplifier and use it in the first demonstration of 40 Gbit/s DPSK phaseregeneration.
|
|
| 7. |
- Slavík, Radan, et al.
(author)
-
All-optical phase and amplitude regenerator for next-generation telecommunications systems
- 2010
-
In: Nature Photonics. - 1749-4885 .- 1749-4893. ; 4:10, s. 690-695
-
Journal article (peer-reviewed)abstract
- Fibre-optic communications systems have traditionally carried data using binary (on-off) encoding of the light amplitude. However, next-generation systems will use both the amplitude and phase of the optical carrier to achieve higher spectral efficiencies and thus higher overall data capacities. Although this approach requires highly complex transmitters and receivers, the increased capacity and many further practical benefits that accrue from a full knowledge of the amplitude and phase of the optical field more than outweigh this additional hardware complexity and can greatly simplify optical network design. However, use of the complex optical field gives rise to a new dominant limitation to system performance—nonlinear phase noise. Developing a device to remove this noise is therefore of great technical importance. Here, we report the development of the first practical (‘black-box’) all-optical regenerator capableof removing both phase and amplitude noise from binary phase-encoded optical communications signals.
|
|
