A bandwidth-compensated ultra-high-speed laser driver circuit and driver chip

Abstract

The invention discloses an ultra high speed laser driver circuit with bandwidth compensation and a diver chip; the feedback circuit composed of two cross coupling capacitors and the capacitor and the resistor connected in a parallel mode is used for executing the laser driver bandwidth compensation. For two cross coupling capacitors, the stray capacitance between the base and the collector can be eliminated; for the feedback mode of one capacitor and one resistor, one zero point is generated for compensating the pole for realizing the bandwidth compensation; and the modulating current directly flows to the laser diode through the load resistor, so that the laser diode can obtain larger modulating current. The laser driver circuit and the driver chip having pre-emphasis function are simple in structure, high in bandwidth, large in modulating current and low in power consumption; the chip adopts the resistor and capacitor for expanding the bandwidth, the occupied area is small and the chip cost is reduced; the work speed is 40Gb / s through the 0.13 mum BiCMOS process certification and the output modulating current is greater than 10 mA.

Description

Technical field

[0001] The invention relates to a laser driver circuit at the transmitting end in a system such as optical fiber communication, and in particular to a bandwidth compensated ultra-high-speed laser driver circuit and a driver chip. Background technique

[0002] The optical fiber communication system has developed rapidly in network and multimedia communication due to its large capacity and other characteristics. The front end of the optical fiber is the light emitting end, which is composed of a multiplexer, a laser driver and a laser diode. The function of the optical transmitter is to multiplex multiple low-speed data signals into a high-speed signal through the multiplexer. After being amplified by the laser driver circuit, the laser diode is driven to emit light, converted into high-speed optical signals, and transmitted through optical fibers. Therefore, the design goal of the laser driver is to obtain high bandwidth and large output modulation swing performan...

Examples

Embodiment Construction

[0024] In the following, the present invention will be further explained in conjunction with the embodiments.

[0025] Such as figure 1 As shown, in the ultra-high-speed laser driver circuit for bandwidth compensation in this embodiment, the connections of various components are as follows:

[0026] The base of the NPN bipolar transistor Q1 is connected to the input voltage V in And capacitance C 1 The first terminal of the transistor Q1 is connected to the resistor R 1 The first terminal and the capacitor C 2 On the first end, the emitter of transistor Q1 is connected to the drain of MOS transistor M1 on the one hand, and resistor R on the other hand 3 The first terminal and the capacitor C 3 The first end of

[0027] The base of the NPN bipolar transistor Q2 is connected to the input voltage V inn And capacitance C 2 The second terminal of the transistor Q2 is connected to the resistor R 2 The first terminal, capacitor C 1 The second terminal of the transistor Q3, the collector o...

Technical field

[0001] The invention relates to a laser driver circuit at the transmitting end in a system such as optical fiber communication, and in particular to a bandwidth compensated ultra-high-speed laser driver circuit and a driver chip. Background technique

[0002] The optical fiber communication system has developed rapidly in network and multimedia communication due to its large capacity and other characteristics. The front end of the optical fiber is the light emitting end, which is composed of a multiplexer, a laser driver and a laser diode. The function of the optical transmitter is to multiplex multiple low-speed data signals into a high-speed signal through the multiplexer. After being amplified by the laser driver circuit, the laser diode is driven to emit light, converted into high-speed optical signals, and transmitted through optical fibers. Therefore, the design goal of the laser driver is to obtain high bandwidth and large output modulation swing performan...

Examples

Embodiment Construction

[0024] In the following, the present invention will be further explained in conjunction with the embodiments.

[0025] Such as figure 1 As shown, in the ultra-high-speed laser driver circuit for bandwidth compensation in this embodiment, the connections of various components are as follows:

[0026] The base of the NPN bipolar transistor Q1 is connected to the input voltage V in And capacitance C 1 The first terminal of the transistor Q1 is connected to the resistor R 1 The first terminal and the capacitor C 2 On the first end, the emitter of transistor Q1 is connected to the drain of MOS transistor M1 on the one hand, and resistor R on the other hand 3 The first terminal and the capacitor C 3 The first end of

[0027] The base of the NPN bipolar transistor Q2 is connected to the input voltage V inn And capacitance C 2 The second terminal of the transistor Q2 is connected to the resistor R 2 The first terminal, capacitor C 1 The second terminal of the transistor Q3, the collector o...

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