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(56) References Cited produce temporal delays and phase shifts Specified by a time-wavelength code for, the Spectral components of an US PATENT DOCUMENTS input optical Signal. Some coders convert optical signals 4,866.699 9/1989 Brackett et al.. encoded with a first time-wavelength code into an output 5,073,980 12/1991 Prucnal et al.. corresponding to a Second time-wavelength code. Temporal 5,136,666 8/1992 Anderson et al.. delays and phase shifts can be Selected to compensate for 5,351,147 9/1994 Frenkel. dispersion in a transmission medium. Coherent coders are 5,473,719 12/1995 Stone................................... 385/123 provided in which the phase shifts produced on the Spectral 5,568,301 10/1996 Tiemann et al.. components of an optical Signal are controlled within about 5,579,105 11/1996 Belton et al......................... 356/310 one half of the wavelength of the spectral component.