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- Title
Analog domain adaptive equalizer for low power 40 Gbps DP-QPSK receivers.
- Authors
NAMBATH, NANDAKUMAR; MOYADE, PAWAN; ANSARI, ALLMIN; GUPTA, SHALABH
- Abstract
Electrical domain equalization of chromatic and polarization mode dispersion is attractive in coherent optical communication links. Digital coherent receivers used for this purpose are based on high speed ADCs followed by DSP, which dissipate excessive amount of power and are very costly to implement. We propose analog coherent receiver to drastically reduce the power consumption, size and cost. An adaptive feed forward equalizer for 40 Gbps dual polarization quadrature phase shift keying (DP-QPSK) systems, which processes signals in analog domain itself, is demonstrated using circuit and system simulations. The equalizer, designed in 90 nm CMOS technology, consumes 450 mW of power and occupies 1.8 mm × 1.1 mm chip area. System simulations are used to show that blind equalization is also possible when this approach is used in decision directed mode.
- Subjects
ADAPTIVE equalization; POLARIZATION (Electricity); OPTICAL communications; SIMULATION methods &; models; QUADRATURE phase shift keying; ENERGY consumption; SIGNAL processing
- Publication
Sādhanā: Academy Proceedings in Engineering Sciences, 2014, Vol 39, Issue 2, p409
- ISSN
0256-2499
- Publication type
Article
- DOI
10.1007/s12046-013-0218-1