title: Low-loss high-speed silicon IQ modulator for QPSK/DQPSK in C and L bands.
abstract: A low-loss high-speed silicon in-phase (I) quadrature (Q) modulator is designed, fabricated and characterized. The fabricated IQ modulator has a low passive optical loss of 9 dB in C and L bands. Using the modulator, differential quadrature phase-shift keying (DQPSK) transmission at 44.6 Gb/s with differential detection is confirmed with an optical signal-to-noise ratio (OSNR) of 16.3 dB for a bit error rate (BER) of 10(-3) and a dispersion tolerance of -96 to 107 ps/nm. Moreover, in digital coherent detection, quadrature phase-shift keying (QPSK) up to 64 Gb/s are achieved with an OSNR of 11.6-11.8 dB for a BER of 10(-2) at 1530, 1550, and 1610 nm.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Goi
authors.forename: Akira
authors.initials: A
authors.lastname: Oka
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kusaka
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Terada
authors.forename: Kensuke
authors.initials: K
authors.lastname: Ogawa
authors.forename: Tsung-Yang
authors.initials: TY
authors.lastname: Liow
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Tu
authors.forename: Guo-Qiang
authors.initials: GQ
authors.lastname: Lo
authors.forename: Dim-Lee
authors.initials: DL
authors.lastname: Kwong
mesh_terms: D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D017711:Nonlinear Dynamics; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D059629:Signal-To-Noise Ratio; D012825:Silicon; D013685:Telecommunications / Q000295:instrumentation*
chemical_list: D012825:Silicon