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All-Optical Signal Processing Techniques for Flexible Networks

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Abstract

Outline a) Flexible Networks b) Enabling Technologies 2. Optical Signal Processing Overview a) Modulation Formats b) Nonlinear Processes c) Materials and Devices 3. Modulation Format Conversion a) De-aggregation of Higher-Order Formats b) Aggregation of Lower-Order Formats 4. Dynamic Bandwidth Allocation a) Fragmented Bandwidth Allocation b) Spectrally Efficient Channel Allocation 5. Phase-Sensitive Functions a) Regeneration b) Raman Assisted Amplification Motivations for Flexible Networks W3E.5.pdf Beneficial Flexibilities in Physical Layer Advantageous of All Optical Signal Processing Outline 1. Introduction a) Flexible Networks b) Enabling Technologies 2. Optical Signal Processing Overview a) Modulation Formats b) Nonlinear Processes c) Materials and Devices 3. Modulation Format Conversion a) De-aggregation of Higher-Order Formats b) Aggregation of Lower-Order Formats 4. Dynamic Bandwidth Allocation a) Fragmented Bandwidth Allocation b) Spectrally Efficient Channel Allocation 5. Phase-Sensitive Functions a) Regeneration Flexible Optical Network Overview Examples of Optical Signal Processing Functions Digital Modulation Coherent Detection Cascaded SFG/SHG and DFG in PPLN: (2) W3E.5.pdf Materials and Devices with High Nonlinearity Comb-based Optical Signal Processing Outline a) Flexible Networks b) Enabling Technologies 2. Optical Signal Processing Overview a) Modulation Formats b) Nonlinear Processes c) Materials and Devices 3. Modulation Format Conversion a) De-aggregation of Higher-Order Formats b) Aggregation of Lower-Order Formats 4. Dynamic Bandwidth Allocation a) Fragmented Bandwidth Allocation b) Spectrally Efficient Channel Allocation 5. Phase-Sensitive Functions a) Regeneration b) Raman Assisted Amplification Optical Modulation Format Conversion All Optical De-aggregation Signal processing is easier for lower order modulation formats Enable a transparent gateways between different communication networks Useful when the signals in long-haul are redirected to short-reach De-aggregation of Single Channel QPSK ❖ Phase de-multiplexing of QPSK signal to BPSK signals ❖ Stabilizing using PLL ❖ OSNR penalty less than 1 dB compared to the B2B BPSK signal Concept of Multiple Channel De-aggregation ❖ In the highly nonlinear fiber (HNLF), we generate the copy and the conjugate copy of the signal in the same frequency to add them. ❖ In the Liquid Crystal on Silicon (LCoS), the amplitude and phase of the signal and its conjugate can be manipulated to generate in-phase and quadrature components. Motivation ❖ Higher-order modulation formats are of extreme interest because of higher spectral efficiency ❖ Reconfigurable transmitter capable of generating higher-order modulation formats ❖ Wave mixing may have higher bandwidth, better linearity, and transparency to the data bit rate and modulation format. Conceptual Block Diagram  Utilizing the narrow linewidth coherent optical frequency combs (soliton combs), multiple lower-order QAM signals can be multiplexed together to generate a higher-order QAM signal.  Vector addition of QAM symbols can be done in a PPLN waveguide n QPSK signals can be combined coherently to generate 4n-QAM  E.g., three QPSK signals are multiplexed to a 64-QAM using coherent comb fingers in one nonlinear stage. Experimental Result Outline a) Flexible Networks b) Enabling Technologies 2. Optical Signal Processing Overview a) Modulation Formats b) Nonlinear Processes c) Materials and Devices 3. Modulation Format Conversion a) De-aggregation of Higher-Order Formats b) Aggregation of Lower-Order Formats 4. Dynamic Bandwidth Allocation a) Fragmented Bandwidth Allocation b) Spectrally Efficient Channel Allocation 5. Phase-Sensitive Functions a) Regeneration b) Raman Assisted Amplification Reconfigurable Bandwidth Allocation Optical Channel Insertion Fragmented Bandwidth Allocation Optical Slicing/Stitching Achieving High Spectral Efficiency Overlapped Channels and ICI Effects MIMO-Based Crosstalk Compensation Optical Mitigation of ICI for Multiple Overlapped Channels Experimental Results Outline a) Flexible Networks b) Enabling Technologies 2. Optical Signal Processing Overview a) Modulation Formats b) Nonlinear Processes c) Materials and Devices 3. Modulation Format Conversion a) De-aggregation of Higher-Order Formats b) Aggregation of Lower-Order Formats 4. Dynamic Bandwidth Allocation a) Fragmented Bandwidth Allocation b) Spectrally Efficient Channel Allocation 5. Phase-Sensitive Functions a) Regeneration Phase-Sensitive Process -Based BPSK/QPSK Regeneration Four Wave Mixing can enable phase regeneration of different modulation formats. Experimental Setup for BPSK Regeneration PLL-free QPSK Regeneration using BA Concept: Brillouin amplification (BA) makes it possible for all signals to share same path. No PLL needed PLL-free QPSK Regeneration using BA WDM Regeneration Simultaneous phase regeneration of 16-WDM DPSK channels using optical Fourier transformation and a single phase-sensitive amplifier Raman Assisted Phase-Sensitive Amplification Raman-assisted PSA ➢ Raman amplification amplifies PSA-pump and idlers with placing signal off the Raman gain bandwidth. ➢ Phase adjustment block, tunes the Gain Extinction ratio (GER) Raman Assisted Phase-Sensitive Amplification Raman-enhanced PSA strengthens the PSA effect and OSNR. Raman Assisted Phase-Sensitive Amplification • Improved performance is observed by placing a Fiber Bragg Grating (FBG) as the phase adjustment block • FBG central wavelength tuning based on thermoelectric effect. Summary reconfigurable functions in physical layer that can enhance network flexibility 2. Flexible conversion between different levels of modulations formats without O/E/O conversions enable transparent gateways between optical networks and efficient use of fiber spectral resources 3. Reconfigurable bandwidth allocation in flex-grid optical network can improve spectral efficiency by fragmentation and overlapping optical channels. 4. Phase sensitive amplification could be beneficial for in-line optical signal regeneration. Raman assistant further enhances the parametric amplification in a phase-sensitive amplifier. Experimental Setup and Results W3E.5.pdf

© 2018 The Author(s)

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