Patent ID: 7286288

Claim:
A dynamic gain tilt equalizer, comprising: a first collimator for collimating a first light beam; a first walk off crystal for receiving the collimated light beam from the collimator and dividing the light beam into a first ordinary beam and a first extraordinary beam; a first half-wave plate for receiving the first extraordinary beam from the first walk off crystal; a first variable Faraday rotator for receiving the first ordinary beam from the first walk-off crystal and the first extraordinary beam from the first half-wave plate; a second walk-off crystal for receiving the first ordinary beam and the first extraordinary beam from the first variable Faraday rotator, for dividing the first ordinary beam into a second ordinary beam and a second extraordinary beam, and for dividing the first extraordinary beam into a third ordinary beam and a third extraordinary beam; a linear tilt optical filter for receiving the second ordinary beam and the third ordinary beam from the second walk-off crystal; a third walk-off crystal for receiving the second extraordinary beam from the second walk-off crystal and combining it with the second ordinary beam from the linear tilt optical filter to form a second light beam, and for receiving the third extraordinary beam from the second walk-off crystal and combining it with the third ordinary beam from the linear tilt optical filter to form a third light beam; a second variable Faraday rotator for receiving the second and the third light beams from the third walk-off crystal; a second half-wave plate for receiving the second light beam from the second variable Faraday rotator; a fourth walk-off crystal for receiving the second light beam from the second half-wave plate and third light beam from the second Faraday rotator, and for combining the second and the third light beam to form a fourth light beam; and a second collimator for receiving the fourth light beam from the fourth walk-off crystal.