L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, C.
Weinert, "C-band optical 90$^{\circ}$-hybrids based on silicon-on-insulator
4$\,\times\,$4 waveguide couplers," IEEE Photon. Technol. Lett. 21, 143-145
(2009).

K. Voigt, L. Zimmermann, G. Winzer, T. Mitze, J.
Bruns, K. Petermann, B. Huttl, C. Schubert, "Performance of 40-Gb/s DPSK
demodulator in SOI-technology," IEEE Photon. Technol. Lett. 20, 614-616
(2008).

N. Neumann, T. Duthel, M. Haas, C. Schaffer, "General
design rules for the synthesis of dispersion and dispersion slope compensation FIR
and IIR filters with reduced complexity," J. Lightw. Technol. 25, 3555-3562
(2007).

T. Duthel, D. Fritzsche, F. Michael, C. Schaffer, D.
Breuer, "Quasianalytic synthesis of nonrecursive optical delay line filters for
reliable compensation of dispersion effects," J. Lightw. Technol. 24, 4403-4410
(2006).

D. Marom, C. Doerr, M. Cappuzzo, E. Y. Chen, A.
Wong-Foy, L. Gomez, S. Chandrasekhar, "Compact colorless tunable dispersion
compensator with 1000-ps/nm tuning range for 40-Gb/s data rates," J. Lightw.
Technol. 24, 237-241 (2006).

C. Doerr, S. Chandrasekhar, M. Cappuzzo, A. Wong-Foy,
E. Chen, L. Gomez, "Four-stage Mach–Zehnder-type tunable optical dispersion
compensator with single-knob control," IEEE Photon. Technol. Lett. 17, 2637-2639
(2005).

F. Kerbstadt, K. Petermann, "Analysis of adaptive
dispersion compensators with double-AWG structures," J. Lightw. Technol. 23,
1468-1477 (2005).

M. Bohn, W. Rosenkranz, P. Krummrich, "Adaptive
distortion compensation with integrated optical finite impulse response filters in
high bitrate optical communication systems," IEEE J. Sel. Topics Quantum Electron.
10, 273-280 (2004).

D.-X. Xu, P. Cheben, D. Dalacu, D. A. , S. Janz, B.
Lamontagne, M.-J. Picard, W. Ye, "Eliminating the birefringence in
silicon-on-insulator ridge waveguides by use of cladding stress," Opt. Lett. 29,
2384-2386 (2004).

F. Horst, R. Germann, U. Bapst, D. Wiesmann, B.
Offrein, G. Bona, "Compact tunable FIR dispersion compensator in SiON technology,"
IEEE Photon. Technol. Lett. 15, 1570-1572 (2003).

H. Wei, J. Yu, Z. Liu, X. Zhang, W. Shi, C. Fang,
"Signal bandwidth of general n$\,\times\,$n multimode interference couplers," J.
Lightw. Technol. 19, 739-745 (2001).

N. Lagali, M. Paiam, R. MacDonald, K. Worhoff, A.
Driessen, "Analysis of generalized Mach–Zehnder interferometers for variable-ratio
power splitting and optimized switching," J. Lightw. Technol. 17, 2542-2550
(1999).

M. Shirasaki, "Chromatic-dispersion compensator using
virtually imaged phased array," IEEE Photon. Technol. Lett. 9, 1598-1600
(1997).

K. Takiguchi, K. Jinguji, K. Okamoto, Y. Ohmori,
"Variable group-delay dispersion equalizer using lattice-form programmable optical
filter on planar lightwave circuit," IEEE J. Sel. Topics Quantum Electron. 2,
270-276 (1996).

P. Besse, M. Bachmann, H. Melchior, L. Soldano, M.
Smit, "Optical bandwidth and fabrication tolerances of multimode interference
couplers," J. Lightw. Technol. 12, 1004-1009 (1994).

M. Bohn, W. Rosenkranz, P. Krummrich, "Adaptive
distortion compensation with integrated optical finite impulse response filters in
high bitrate optical communication systems," IEEE J. Sel. Topics Quantum Electron.
10, 273-280 (2004).

K. Takiguchi, K. Jinguji, K. Okamoto, Y. Ohmori,
"Variable group-delay dispersion equalizer using lattice-form programmable optical
filter on planar lightwave circuit," IEEE J. Sel. Topics Quantum Electron. 2,
270-276 (1996).

M. Shirasaki, "Chromatic-dispersion compensator using
virtually imaged phased array," IEEE Photon. Technol. Lett. 9, 1598-1600
(1997).

F. Horst, R. Germann, U. Bapst, D. Wiesmann, B.
Offrein, G. Bona, "Compact tunable FIR dispersion compensator in SiON technology,"
IEEE Photon. Technol. Lett. 15, 1570-1572 (2003).

C. Doerr, S. Chandrasekhar, M. Cappuzzo, A. Wong-Foy,
E. Chen, L. Gomez, "Four-stage Mach–Zehnder-type tunable optical dispersion
compensator with single-knob control," IEEE Photon. Technol. Lett. 17, 2637-2639
(2005).

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, C.
Weinert, "C-band optical 90$^{\circ}$-hybrids based on silicon-on-insulator
4$\,\times\,$4 waveguide couplers," IEEE Photon. Technol. Lett. 21, 143-145
(2009).

K. Voigt, L. Zimmermann, G. Winzer, T. Mitze, J.
Bruns, K. Petermann, B. Huttl, C. Schubert, "Performance of 40-Gb/s DPSK
demodulator in SOI-technology," IEEE Photon. Technol. Lett. 20, 614-616
(2008).

N. Neumann, T. Duthel, M. Haas, C. Schaffer, "General
design rules for the synthesis of dispersion and dispersion slope compensation FIR
and IIR filters with reduced complexity," J. Lightw. Technol. 25, 3555-3562
(2007).

T. Duthel, D. Fritzsche, F. Michael, C. Schaffer, D.
Breuer, "Quasianalytic synthesis of nonrecursive optical delay line filters for
reliable compensation of dispersion effects," J. Lightw. Technol. 24, 4403-4410
(2006).

P. Besse, M. Bachmann, H. Melchior, L. Soldano, M.
Smit, "Optical bandwidth and fabrication tolerances of multimode interference
couplers," J. Lightw. Technol. 12, 1004-1009 (1994).

H. Wei, J. Yu, Z. Liu, X. Zhang, W. Shi, C. Fang,
"Signal bandwidth of general n$\,\times\,$n multimode interference couplers," J.
Lightw. Technol. 19, 739-745 (2001).

N. Lagali, M. Paiam, R. MacDonald, K. Worhoff, A.
Driessen, "Analysis of generalized Mach–Zehnder interferometers for variable-ratio
power splitting and optimized switching," J. Lightw. Technol. 17, 2542-2550
(1999).

F. Kerbstadt, K. Petermann, "Analysis of adaptive
dispersion compensators with double-AWG structures," J. Lightw. Technol. 23,
1468-1477 (2005).

D. Marom, C. Doerr, M. Cappuzzo, E. Y. Chen, A.
Wong-Foy, L. Gomez, S. Chandrasekhar, "Compact colorless tunable dispersion
compensator with 1000-ps/nm tuning range for 40-Gb/s data rates," J. Lightw.
Technol. 24, 237-241 (2006).

D.-X. Xu, P. Cheben, D. Dalacu, D. A. , S. Janz, B.
Lamontagne, M.-J. Picard, W. Ye, "Eliminating the birefringence in
silicon-on-insulator ridge waveguides by use of cladding stress," Opt. Lett. 29,
2384-2386 (2004).

C. Doerr, D. Marom, M. Cappuzzo, E. Chen, A. Wong-Foy,
L. Gomez, S. Chandrasekhar, "40-Gb/s colorless tunable dispersion compensator with
1000-ps/nm tuning range employing a planar lightwave circuit and a deformable
mirror," Proc. Opt. Fiber Commun. Conf./NFOEC (2005) pp. 1-3.

N. Fontaine, J. Yang, W. Jiang, D. Geisler, K.
Okamoto, R. Huang, S. Yoo, "Active arrayed-waveguide grating with amplitude and
phase control for arbitrary filter generation and high-order dispersion
compensation," 34th Eur. Conf. Opt. Commun. (2008) pp. 1-2.

Optical Fiber Telecommunications (Academic, 2008) pp.
325-336.

C. K. Madsen, J. H. Zhao, Optical Filter Design and
Analysis: A Signal Processing Approach (Wiley-Interscience, 1999).

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann,
"Towards silicon on insulator DQPSK demodulators," Proc. Opt. Fiber Commun./Nat.
Fiber Opt. Eng. Conf. (2010) pp. 1-3.

K. Voigt, L. Zimmermann, G. Winzer, K. Petermann, "SOI
based 2$\,\times\,$2 and 4$\,\times\,$4 waveguide couplers—evolution from DPSK to
DQPSK," Proc. 5th IEEE Int. Conf. Group IV Photon. (2008) pp.
209-211.

N. Neumann, T. Schuster, C. Schaffer, "Simple filter
for dispersion estimation via optical VSB filtering," 35th Eur. Conf. Opt. Commun.
(2009) pp. 1-2.

R. W. S. A. V. Oppenheim, J. R. Buck, Discrete-Time
Signal Processing (Prentice-Hall, 1999).