Optical transmitter that includes optical modulator

An optical transmitter comprising:

• an optical modulator that includes a Mach-Zehnder interferometer, a first phase shift segment, and a second phase shift segment, the first phase shift segment and the second phase shift segment each being configured to shift a phase of light propagating through an optical path of the Mach-Zehnder interferometer;
• and
• a drive circuit that generates a drive signal for driving the first phase shift segment and the second phase shift segment, wherein
• the drive circuit includes:
• a first circuit that generates a first electric signal from an input signal indicating transmission data, as the drive signal;
• and
• a second circuit that generates a second electric signal that emphasizes an edge of the first electric signal based on the input signal, as the drive signal,
• the drive circuit provides the first electric signal to the first phase shift segment and provides the second electric signal to the second phase shift segment, and
• the second circuit includes:
• a delay circuit that delays the input signal to generate a first delay signal;
• a second delay circuit that delays the first delay signal to generate a second delay signal;
• and
• a subtractor circuit that generates, as the second electric signal, a signal obtained by subtracting the first delay signal from the input signal and a signal obtained by subtracting the second delay signal from the input signal.

An optical transmitter comprising:

• an optical modulator that includes a Mach-Zehnder interferometer, a first phase shift segment, and a second phase shift segment, the first phase shift segment and the second phase shift segment each being configured to shift a phase of light propagating through an optical path of the Mach-Zehnder interferometer;
• and
• a drive circuit that generates a drive signal for driving the first phase shift segment and the second phase shift segment, wherein
• the drive circuit includes:
• a first circuit that generates a first electric signal from an input signal indicating transmission data, as the drive signal;
• and
• a second circuit that generates a second electric signal that emphasizes an edge of the first electric signal based on the input signal, as the drive signal,
• the drive circuit provides the first electric signal to the first phase shift segment and provides the second electric signal to the second phase shift segment,
• the input signal is a differential signal including a non-inverted signal and an inverted signal, and
• the second circuit includes:
• a delay circuit that delays the non-inverted signal and the inverted signal to generate a non-inverted delay signal and an inverted delay signal;
• and
• an addition circuit that generates the second electric signal by adding the inverted delay signal to the non-inverted signal and adding the non-inverted delay signal to the inverted signal.

An optical transmitter comprising:

• an optical modulator that includes a Mach-Zehnder interferometer, a first phase shift segment, and a second phase shift segment, the first phase shift segment and the second phase shift segment each being configured to shift a phase of light propagating through an optical path of the Mach-Zehnder interferometer;
• and
• a drive circuit that generates a drive signal for driving the first phase shift segment and the second phase shift segment, wherein
• the drive circuit includes:
• a first circuit that generates a first electric signal from an input signal indicating transmission data, as the drive signal;
• and
• a second circuit that generates a second electric signal that emphasizes an edge of the first electric signal based on the input signal, as the drive signal,
• the drive circuit provides the first electric signal to the first phase shift segment and provides the second electric signal to the second phase shift segment,
• the input signal is a differential signal including a non-inverted signal and an inverted signal, and
• the second circuit includes:
• a delay circuit that delays the non-inverted signal and the inverted signal to generate a non-inverted delay signal and an inverted delay signal;
• and
• a logic circuit that generates, as the second electric signal, a first logical product signal indicating a logical product of the non-inverted signal and the inverted delay signal, a second logical product signal indicating a logical product of the inverted signal and the non-inverted delay signal, a first logical sum signal indicating a logical sum of the non-inverted signal and the inverted delay signal, and a second logical sum signal indicating a logical sum of the inverted signal and the non-inverted delay signal.

An optical transmitter comprising:

• an optical modulator that includes a Mach-Zehnder interferometer, a first phase shift segment, and a second phase shift segment, the first phase shift segment and the second phase shift segment each being configured to shift a phase of light propagating through an optical path of the Mach-Zehnder interferometer;
• and
• a drive circuit that generates a drive signal for driving the first phase shift segment and the second phase shift segment, wherein
• the drive circuit includes:
• a first circuit that generates a first electric signal from an input signal indicating transmission data, as the drive signal;
• and
• a second circuit that generates a second electric signal that emphasizes an edge of the first electric signal based on the input signal, as the drive signal,
• the drive circuit provides the first electric signal to the first phase shift segment and provides the second electric signal to the second phase shift segment, and
• the first phase shift segment is terminated with a resistor and the second phase shift segment is terminated with an inductor and a capacitor connected in series to the inductor.