Promblem Arduino Mega whit Timer One

I have a problem with Arduino Mega, using TimerOne.h library
I have try to configure pin 11 as output PWM and set 2000us as period.

I have implemented this simple code:

#include <TimerOne.h>
void setup(){
pinMode(11, OUTPUT);

void loop(){

// initialize timer1, and set a 1/2 second period
Timer1.pwm(11, 512);

I can't see the output