SEMICONDUCTOR LASER DEVICE AND CIRCUIT FOR AND METHOD OF DRIVING SAME
First Claim
Patent Images
1. A distributed feedback (DFB) laser, comprising:
- a waveguide including an active region, with a grating in or about the waveguide, the waveguide having a longitudinal length in a direction between a front facet and a rear facet, the waveguide being generally about layers forming a p-n junction, and an anode electrical contact and a cathode electrical contact;
with at least one of the anode electrical contact and the cathode electrical contact having a longitudinal length in the direction between the front facet and the rear facet less than the longitudinal length of the active region.
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Abstract
A directly driven laser includes multiple contacts, with at least one of the contacts for injecting current into the laser such that the laser reaches at least a lasing threshold and at least one of the contacts for providing a data signal to the laser. In some embodiments a differential data signal is effectively provided to a front and a rear section of the laser, while lasing threshold current is provided to a central portion of the laser.
17 Citations
34 Claims
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1. A distributed feedback (DFB) laser, comprising:
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a waveguide including an active region, with a grating in or about the waveguide, the waveguide having a longitudinal length in a direction between a front facet and a rear facet, the waveguide being generally about layers forming a p-n junction, and an anode electrical contact and a cathode electrical contact; with at least one of the anode electrical contact and the cathode electrical contact having a longitudinal length in the direction between the front facet and the rear facet less than the longitudinal length of the active region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating a laser, comprising:
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providing a data current signal into a first longitudinal portion of the laser and not providing the data current signal into a second longitudinal portion of the laser; and providing a bias current signal into the second longitudinal portion of the laser and not providing the bias current signal into the first longitudinal portion of the laser. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of operating a laser, comprising:
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providing a differential signal to a pair of gain stages within a package containing the laser, the differential signal providing a data signal, the pair of gain stages providing a signal to a front portion of the laser and/or a rear portion of the laser depending on state of the differential signal; and providing a bias signal to a central portion of the laser.
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25. A laser and drive circuitry, comprising:
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a laser with a first electrical contact and a second electrical contact, each for provision of current signals to the laser, and a contact coupled to ground; a dc current source coupled to the first electrical contact; and a data signal driver coupled to the second electrical contact. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification