Optical module
An optical module includes: a laser device; a wavelength detector; a modulator; a modulator driver; a coherent mixer; a photoelectric element; a transimpedance amplifier; and a casing. Further, the laser device is arranged such that the laser device outputs a laser light beam in a direction opposite to a side on which the optical output unit is arranged in the casing.
1. An optical transceiver module comprising:
an optical transmitter comprising:
a laser device configured to output a laser light beam,
a wavelength detector to which the laser light beam that is output from the laser device is input, the wavelength detector being configured to detect a wavelength of the input laser light beam, and
a modulator configured to modulate the laser light beam and generate modulated light beam;
a modulator driver configured to drive the modulator;
an optical receiver comprising:
a coherent mixer to which an input signal light beam that is input from outside the optical transceiver module and a local light beam are input, the coherent mixer being configured to process the input signal light beam and generate a processed signal light beam,
a photoelectric element configured to convert the processed signal light beam into a current signal,
a transimpedance amplifier configured to convert the current signal into a voltage signal; and
a casing in which the laser device, the wavelength detector, the modulator, the modulator driver, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, and which is sealed in an airtight manner, wherein the casing comprises:
an optical output unit configured to output an output signal light beam containing the modulated light beam generated by the optical transmitter for outputting from the optical transceiver module, and
an optical input unit to which the input signal light beam is input to the optical transceiver module for input to the coherent mixer of the optical receiver; and
wherein the optical transceiver module is configured such that:
at least a part of a longitudinal side of the modulator faces a longitudinal side of the coherent mixer, with the laser device and the wavelength detector being arranged between the longitudinal side of the modulator and the longitudinal side of the coherent mixer which face each other, such that the casing has a length equal to or smaller than 15 mm in a width direction orthogonal to a longitudinal direction,
the laser device or the wavelength detector is arranged, in the width direction of the casing, between a center line of the coherent mixer that extends in the longitudinal direction and a center line of the modulator that extends in the longitudinal direction,
the coherent mixer, the modulator, and one of the laser device and the wavelength detector are all parts that are longer in the longitudinal direction than in the width direction and are arranged such that their longitudinal directions—are parallel to each other,
the optical transceiver module has a height equal to or smaller than 6.5 mm and a length equal to or smaller than 35 mm, the length being measured from a first longitudinal end of the casing to an optical reference plane at a second longitudinal end of the casing which is opposite to the first longitudinal end, the optical reference plane being a plane where a face of an optical fiber which inputs or outputs a light signal makes contact with the optical transceiver module, and
the optical transceiver module complies with a QSFP-DD standards.
2. The optical transceiver module according to claim 1 , further comprising a controller that is mounted on a side opposite to a side of the casing in a height direction on which the laser device, the wavelength detector, the modulator, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, the controller being configured to control operations of the optical transceiver module.
3. The optical transceiver module according to claim 1 , wherein the laser device is arranged such that the laser device outputs the laser light beam in a direction opposite to a side on which the optical output unit is arranged in the casing.
4. The optical transceiver module according to claim 3 , further comprising a controller that is mounted on a side opposite to a side of the casing in a height direction on which the laser device, the wavelength detector, the modulator, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, the controller being configured to control operations of the optical transceiver module.
5. The optical transceiver module according to claim 1 , wherein the modulator has a turning structure by which a direction in which light beam that is input travels turns inside.
6. The optical transceiver module according to claim 5 , further comprising a controller that is mounted on a side opposite to a side of the casing in a height direction on which the laser device, the wavelength detector, the modulator, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, the controller being configured to control operations of the optical transceiver module.
7. The optical transceiver module according to claim 1 , wherein the optical transceiver module is configured such that optical axes of at least two light beams intersect with each other in the casing.
8. The optical transceiver module according to claim 7 , further comprising a controller that is mounted on a side opposite to a side of the casing in a height direction on which the laser device, the wavelength detector, the modulator, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, the controller being configured to control operations of the optical transceiver module.
9. The optical transceiver module according to claim 1 ,
wherein the laser device and the wavelength detector are arranged such that a position in the laser device in which laser light beam to be input to the wavelength detector is output and a position in the wavelength detector in which the laser light beam is input differ from each other in the width direction of the casing,
the modulator and the modulator driver are arranged in series approximately in parallel and thus configure a modulation unit,
the coherent mixer, the photoelectric element, and the transimpedance amplifier are arranged in series approximately in parallel in the longitudinal direction of the casing and thus configure an optical processing unit, the modulation unit and the optical processing unit are arranged in parallel in the width direction,
in the modulator, a position in which the laser light beam is input and a position in which the modulated light beam is output are arranged on the same side surface, and
a side surface of the coherent mixer to which the input signal light beam and the local light beam are input approximately parallel to the side surface of the modulator.
10. The optical transceiver module according to claim 9 , further comprising a controller that is mounted on a side opposite to a side of the casing in a height direction on which the laser device, the wavelength detector, the modulator, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, the controller being configured to control operations of the optical transceiver module.
11. The optical transceiver module according to claim 1 ,
wherein the laser device and the wavelength detector are arranged such that a position in the laser device in which laser light beam to be input to the wavelength detector is output and a position in the wavelength detector in which the laser light beam is input differ from each other in the width direction of the casing,
the modulator and the modulator driver are arranged in series approximately in parallel in the longitudinal direction of the casing, thus configuring a modulation unit,
the coherent mixer, the photoelectric element, and the transimpedance amplifier are arranged in series approximately in parallel in the longitudinal direction of the casing, thus configure an optical processing unit,
the modulation unit and the optical processing unit are arranged in parallel in the width direction,
in the modulator, a position in which the laser light beam is input and a position in which the modulated light beam is output are arranged on the same side surface, and
a side surface of the coherent mixer to which the local light beam is input is approximately orthogonal to the side surface of the modulator.
12. The optical transceiver module according to claim 11 , further comprising a controller that is mounted on a side opposite to a side of the casing in a height direction on which the laser device, the wavelength detector, the modulator, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, the controller being configured to control operations of the optical transceiver module.
13. An optical transceiver module comprising:
an optical transmitter comprising:
a laser device configured to output a laser light beam,
a wavelength detector to which the laser light beam that is output from the laser device is input, the wavelength detector being configured to detect a wavelength of the input laser light beam, and
a modulator configured to modulate the laser light beam and generate modulated light beam;
a modulator driver configured to drive the modulator;
an optical receiver comprising:
a coherent mixer to which an input signal light beam that is input from outside the optical transceiver module and a local light beam are input, the coherent mixer being configured to process the input signal light beam and generate a processed signal light beam,
a photoelectric element configured to convert the processed signal light beam into a current signal, and
a transimpedance amplifier configured to convert the current signal into a voltage signal; and
a casing in which the laser device, the wavelength detector, the modulator, the modulator driver, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, and which is sealed in an airtight manner, wherein the casing comprises:
an optical output unit configured to output an output signal light beam containing the modulated light beam generated by the optical transmitter for outputting from the optical transceiver module; and
an optical input unit to which the input signal light beam is input to the optical transceiver module for input to the coherent mixer of the optical receiver; and
wherein the optical transceiver module is configured such that:
at least a part of a longitudinal side of the modulator faces a longitudinal side of the coherent mixer, with the laser device and the wavelength detector being arranged between the longitudinal side of the modulator and the longitudinal side of the coherent mixer which face each other, such that the casing has a length equal to or smaller than 15 mm in a width direction orthogonal to a longitudinal direction,
the laser device and the wavelength detector are arranged in series with each other and approximately in parallel with the longitudinal direction of the casing, and further arranged such that a position in the laser device in which laser light beam to be input to the wavelength detector is output and a position in the wavelength detector in which the laser light beam is input approximately coincide in the width direction of the casing, thus configuring a laser assembly,
the modulator and the modulator driver are arranged in series with each other and approximately in parallel in the longitudinal direction of the casing, thus configuring a modulation unit,
the coherent mixer, the photoelectric element, and the transimpedance amplifier are arranged in series with each other and approximately in parallel in the longitudinal direction of the casing, thus configuring an optical processing unit,
the laser assembly, the modulation unit, and the optical processing unit are arranged in parallel in the width direction,
in the modulator, a position in which the laser light beam is input and a position in which the modulated light beam is output are arranged on the same side surface,
a side surface of the coherent mixer to which the input signal light beam is input is approximately parallel to the side surface of the modulator,
the laser assembly, the modulation unit, and the optical processing unit are all parts that are longer in the longitudinal direction than in the width direction and are arranged such that their longitudinal directions are parallel to each other,
the optical transceiver module has a height equal to or smaller than 6.5 mm and a length equal to or smaller than 35 mm, the length being measured from a first longitudinal end of the casing to an optical reference plane at a second longitudinal end of the casing which is opposite to the first longitudinal end, the optical reference plane being a plane where a face of an optical fiber which inputs or outputs a light signal makes contact with the optical transceiver module, and
the optical transceiver module complies with a QSFP-DD standards.
14. The optical transceiver module according to claim 13 , further comprising a controller that is mounted on a side opposite to a side of the casing in a height direction on which the laser device, the wavelength detector, the modulator, the coherent mixer, the photoelectric element, and the transimpedance amplifier are mounted, the controller being configured to control operations of the optical transceiver module.