Title :
A 12.5Gbps analog timing recovery system for PRML optical receivers
Author :
Edwards, Jomo ; Gill, Chris ; Tran, Kelvin ; Linder, Lloyd ; Zelenin, Denis ; Baranauskas, Dalius ; Bussmann, Matthias ; Elahmadi, Salam ; Tan, Harry
Author_Institution :
Menara Networks, Irvine, CA, USA
Abstract :
This paper describes a timing recovery system (TRS) based on an analog approximation of the minimum mean squared error (MMSE) algorithm. The TRS has been fabricated in a 0.18 mum, 150 GHz SiGe BiCMOS process as part of a high performance Class-2 Partial Response Maximum Likelihood (PRML) dispersion tolerant optical receiver. This decision directed clock recovery architecture was implemented for the (1+D)2 partial response polynomial. The TRS supports all XFI data rates [9.95, 11.09] Gbps and has been verified up to 12.5 Gbps. The TRS is functional at OSNRs as low as 11 dB and has been verified in the full PRML receiver at a BER of 10-4 over 400 km of uncompensated single mode fiber (SMF). It dissipates 372 mW from a dual 3.3 V and 1.8 V supply and complies with or exceeds all XFI receiver Jitter specifications for Telecom (SONET OC-192 and G.709 ldquoOTU-2rdquo) and Datacom (Ethernet 802.3ae or Fiber Channel).
Keywords :
BiCMOS integrated circuits; Ge-Si alloys; least mean squares methods; local area networks; maximum likelihood sequence estimation; optical receivers; partial response channels; synchronisation; timing jitter; BiCMOS process; Datacom; Ethernet 802.3ae; G.709 OTU-2; PRML optical receivers; SONET OC-192; SiGe; Telecom; XFI receiver jitter specifications; analog timing recovery system; bit rate 9.95 Gbit/s to 12.5 Gbit/s; class-2 partial response maximum likelihood; decision directed clock recovery architecture; dispersion tolerant optical receiver; fiber channel; frequency 150 GHz; minimum mean squared error algorithm; partial response polynomial; power 372 mW; size 0.18 mum; voltage 1.8 V; voltage 3.3 V; Approximation algorithms; BiCMOS integrated circuits; Clocks; Germanium silicon alloys; Optical noise; Optical receivers; Polynomials; Signal to noise ratio; Silicon germanium; Timing; CDR; MLSE; PLL; PRML; PRS; partial response signaling; timing recovery;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium, 2009. RFIC 2009. IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-3377-3
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2009.5135597
