Gigabit ethernet longwave optical transceiver module having amplified bias current
First Claim
1. An optical transceiver module, comprising:
- a transmitter optical subassembly including a laser capable of producing an optical signal;
a laser driver including a first bias current source that provides a bias current to the laser and a modulation current source that provides a modulation current to the laser, the bias and modulation currents for producing the optical signal; and
means, separate from the laser driver, for amplifying substantially only the bias current provided to the laser by the first bias current source,wherein;
the first bias current source and the means, separate from the laser driver, for amplifying substantially only the bias current are at least partially controlled by the same control line,the laser is configured for longwave optical transmission,the laser driver is configured for longwave optical transmission in the optical transceiver module and may be configured for shortwave optical transmission in a different optical transceiver module by omitting the means, separate from the laser driver, for amplifying substantially only the bias current,the means, separate from the laser driver, for amplifying substantially only the bias current operably connects with an LDBIAS pin and an LDCCOMP pin of the laser driver.
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Accused Products
Abstract
An optical transceiver module configured for longwave optical transmission is disclosed. Significantly, the transceiver module utilizes components formerly used only for shortwave optical transmission, thereby reducing new component production and device complexity. In one embodiment, the transceiver module includes a transmitter optical subassembly including a laser capable of producing an optical signal. A consolidated laser driver/post amplifier including a first bias current source provides a bias current to the laser for producing the optical signal. A means for amplifying the bias current provided to the laser by the first bias current source is also included as a separate component from the laser driver/post amplifier. The means for amplifying in one embodiment is a field-effect transistor that is operably connected to the laser driver/post amplifier and configured to provide an additional bias current to the laser diode such that sufficient lasing operation of the laser is realized.
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Citations
21 Claims
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1. An optical transceiver module, comprising:
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a transmitter optical subassembly including a laser capable of producing an optical signal; a laser driver including a first bias current source that provides a bias current to the laser and a modulation current source that provides a modulation current to the laser, the bias and modulation currents for producing the optical signal; and means, separate from the laser driver, for amplifying substantially only the bias current provided to the laser by the first bias current source, wherein; the first bias current source and the means, separate from the laser driver, for amplifying substantially only the bias current are at least partially controlled by the same control line, the laser is configured for longwave optical transmission, the laser driver is configured for longwave optical transmission in the optical transceiver module and may be configured for shortwave optical transmission in a different optical transceiver module by omitting the means, separate from the laser driver, for amplifying substantially only the bias current, the means, separate from the laser driver, for amplifying substantially only the bias current operably connects with an LDBIAS pin and an LDCCOMP pin of the laser driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical transmitter, comprising:
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a light source; a driver including internal circuitry that provides a first bias current and a modulation current to the light source; and a bias current amplifier that amplifies substantially only the first bias current provided to the light source, wherein; the bias current amplifier is operably connected to and controlled by the driver via a single control line, the light source is a laser configured for longwave optical transmission, the laser driver is a laser driver configured for longwave optical transmission in the optical transmitter and may be configured for shortwave optical transmission in a different optical transmitter by omitting the bias current amplifier that amplifies substantially only the first bias current provided to the light source, the bias current amplifier operably connects with an LDBIAS pin and an LDCCOMP pin of the laser driver. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An optical transceiver module configured for longwave optical transmission, comprising:
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a transmitter optical subassembly coupled to an optical fiber and including a laser; a receiver optical subassembly coupled to an optical fiber; and a printed circuit board including;
a consolidated laser driver/post amplifier that includes circuitry to provide a bias current and a modulation current to the laser; anda field-effect transistor operably connected to bias loop control circuitry of the laser driver/post amplifier and configured to provide an additional bias current to the laser diode, wherein the field-effect transistor does not amplify the modulation current, and wherein; the circuitry of the laser driver/post amplifier that provides the bias current is voltage biased by the bias loop control circuitry of the laser driver/post amplifier; the field-effect transistor is connected in parallel with the circuitry of the laser driver/post amplifier that provides the bias current; a gate portion of the field-effect transistor is operably connected to the bias loop control circuitry of the laser driver/post amplifier; a drain portion of the field-effect transistor is operably connected to an LDBIAS pin of the laser driver/post amplifier; and a source portion of the field-effect transistor is operably connected to ground. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification