Wavelength aligning apparatus using arrayed waveguide grating

Details Wavelength aligning apparatus using arrayed waveguide grating Wavelength aligning apparatus using arrayed waveguide grating

1997-12-05

2000-09-12

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359133, 359187, 372 23, 372 29, H04J 1402

Patent

active

061185620

ABSTRACT:
A wavelength aligning apparatus using an arrayed waveguide grating (AWG), and particularly, to a wavelength aligning apparatus using an arrayed waveguide grating which is capable of aligning optical sources using a transmission characteristic of an arrayed waveguide grating in a wavelength alignment method. The apparatus includes a signal generator for applying a signal spaced-apart at a predetermined interval near a predetermined frequency to a bias current of the light source and dithering a central wavelength of each light source, an arrayed waveguide grating for providing a reference wavelength causing a variation difference from the central portion due to a dithering of the central wavelength, a temperature controller for determining a reference wave length by constantly maintaining a temperature of the arrayed waveguide grating, an optical fiber coupler disposed in an output terminal of the arrayed waveguide grating for dividing the signal into a transmission signal and an incoming signal, a plurality of locking amplifiers and a proportional/integration/differentiating unit for computing a bias current corresponding to the detected error signal, and a superposing unit for superposing the computed bias current and a signal from the signal generator for output to the laser diode driver.

REFERENCES:
patent: 5673129 (1997-09-01), Mizrahi
patent: 5917625 (1999-06-01), Ogusu et al.
"A Monolithic Multiplexed 16-Wavelenth WDM Transmitter With Accurate Channel Spacing", C.R. Doerr, C. H. Joyner, M. Zirnigibl, R. Monnard, and L. W. Stulz, Bell Laboratories, Lucent Technologies, p. PD12-2 to PD12-5.

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