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Optics Letters

Optics Letters


  • Vol. 27, Iss. 15 — Aug. 1, 2002
  • pp: 1318–1320

Dispersion compensation of a 1× N passive optical router with low loss, a flat passband, and low cross talk

L. Leick and C. K. Madsen  »View Author Affiliations

Optics Letters, Vol. 27, Issue 15, pp. 1318-1320 (2002)

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A 1×N interferometer–based router with single-stage all-pass filters in the arms has low loss, a flat passband, and low cross talk. However, we show that the router has substantial cubic dispersion over the channel passband, which is identical from channel to channel. For a 1×4 router with a free spectral range of 100 GHz, the average dispersion slope over a 60% passband is -8×103ps/nm2, and thus a cascade of four routers incurs a significant system power penalty. A three-stage all-pass filter placed on the input arm reduces the dispersion of all channels by a factor of 16. The router is quite insensitive to variations in the all-pass filter design parameters.

© 2002 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(130.3120) Integrated optics : Integrated optics devices
(230.4320) Optical devices : Nonlinear optical devices
(230.7390) Optical devices : Waveguides, planar
(260.2030) Physical optics : Dispersion

L. Leick and C. K. Madsen, "Dispersion compensation of a 1× N passive optical router with low loss, a flat passband, and low cross talk," Opt. Lett. 27, 1318-1320 (2002)

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