Chirped waveguide grating router with focal length adjustment

Details Chirped waveguide grating router with focal length adjustment Chirped waveguide grating router with focal length adjustment

1997-02-07

1999-06-01

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Plural

385 37, 385 46, G02B 628

Patent

active

059095229

ABSTRACT:
An improved waveguide grating router enhances the transmissivity of a dominant passband selected from a plurality of passbands. The router includes a first waveguide coupler, a second waveguide coupler, and a plurality of M waveguides coupled between the first and second waveguide couplers. Each waveguide m has a length L(m). The difference in length (.DELTA.L) between any two adjacent waveguides, m and (m-1), is equal to an arbitrary constant plus (A*m) for each of the waveguides. Mathematically, this may be expressed as .DELTA.L={L(m)-L(m-1)}=k+A*(m), where k is an arbitrary constant, m denotes a given waveguide out of a total M waveguides, and A is a positive or negative real number. In this manner, the difference in length .DELTA.L between adjacent waveguide arms is a monotonically increasing or decreasing function of m; i.e., a parabolic function of m. The focal lengths of the second waveguide coupler are related to A, thereby enhancing the transmissivity of a dominant passband selected from a plurality of passbands.

REFERENCES:
patent: 5136671 (1992-08-01), Dragone
patent: 5341444 (1994-08-01), Henry et al.
patent: 5636300 (1997-06-01), Keck et al.
"Chirping of the Waveguide Grating Router for Free-Spectral-Range Mode Selection in the Multifrequency Laser", C. R. Doerr, et al., IEEE Photonics Tech. Ltrs, vol. 8, Apr. '96, pp. 500-502.

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